Study on Fatigue Life of Plow Bit under Different Planning Parameters
In order to study the fatigue life of plow bit under
 different planning parameters, the process of
 plow bit cutting coal seam is simulated based on
 a solid model. The variation of the stress in the
 joint between the blade and carbide head is obtained
 by s...
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| Published in: | Проблемы прочности |
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| Date: | 2014 |
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| Format: | Article |
| Language: | English |
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Інститут проблем міцності ім. Г.С. Писаренко НАН України
2014
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/112709 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Study on Fatigue Life of Plow Bit under Different Planning Parameters / Q. Zhang, M.J. Xu, N. Hu // Проблемы прочности. — 2014. — № 2. — С. 132-140. — Бібліогр.: 11 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1860185337846824960 |
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| author | Zhang, Q. Xu, M.J. Hu, N. |
| author_facet | Zhang, Q. Xu, M.J. Hu, N. |
| citation_txt | Study on Fatigue Life of Plow Bit under Different Planning Parameters / Q. Zhang, M.J. Xu, N. Hu // Проблемы прочности. — 2014. — № 2. — С. 132-140. — Бібліогр.: 11 назв. — англ. |
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| container_title | Проблемы прочности |
| description | In order to study the fatigue life of plow bit under
different planning parameters, the process of
plow bit cutting coal seam is simulated based on
a solid model. The variation of the stress in the
joint between the blade and carbide head is obtained
by simulating the planning process with
different planning parameters of the weak joint
(cutting angle, plow thickness and plow spacing).
The fatigue life of the plow bit is predicted
using the improved rain-flow method and the
Miner linear accumulated fatigue damage model.
According to the experiment on plow bit life,
the stress amplitude and accumulated damage in
one stroke are the least at the cutting angle of
80C, with the number of working strokes and
working hours of a damaged plow bit reaching
the maximum. The thicker the plow bit is, the
larger is the resistance and higher is the damage.
In addition, a smaller plow spacing implies a
better planning ability and a smaller damage.
The experimental data are consistent with the results
of the theoretical analysis.
С целью исследования усталостной долговечности бурового долота с различными параметрами технологического проектирования проведено моделирование процесса подрезки угольного пласта с помощью долота на основе твердотельной модели. Изменение напряжения в
соединении между лопаткой и твердосплавной головкой получили путем моделирования
процесса проектирования при различных параметрах разработки слабого соединения (угол
подрезки, толщина и шаг долота). Усталостную долговечность долота прогнозировали с
помощью усовершенствованного метода дождевого потока и правила Майнера. Согласно
данным испытаний на усталость значения амплитуды напряжений и накопления повреждений за один ход являются наименьшими при угле подрезки 80, при этом количество рабочих
ходов и часов поврежденного долота достигает максимума. Чем толще долото, тем больше
его сопротивление и тем значительнее повреждение. Кроме того, чем меньше шаг долота,
тем проще его спроектировать и тем меньше повреждение. Результаты испытаний соответствуют данным теоретического анализа.
Із метою дослідження довговічності від утомленості бурового долота з різними
параметрами технологічного проектування проведено моделювання процесу підрізки
вугільного пласта за допомогою долота на основі твердотільної моделі. Зміну напруження в з’єднанні між лопаткою і твердосплавною головкою отримали шляхом
моделювання процесу проектування за різних параметрів розробки слабкого з’єднання (кут підрізки, товщина і крок долота). Довговічність від утомленості долота
спрогнозували за допомогою удосконаленого методу дощового потоку і правила
Майнера. Згідно з даними випробувань на утому значення амплітуди напружень і
накопичення пошкоджень за один хід є найменшими при куті підрізки 80, при цьому
кількість робочих ходів і годин пошкодженого долота сягає максимуму. Чим товще
долото, тим більший його опір і тим значніше пошкодження. Окрім того, чим
менший крок долота, тим простіше його спроектувати і тим менше пошкодження.
Результати випробувань збігаються з даними теоретичного аналізу.
|
| first_indexed | 2025-12-07T18:04:24Z |
| format | Article |
| fulltext |
UDC 539.4
Study on Fatigue Life of Plow Bit under Different Planning Parameters
Q. Zhang,
a,b,c
M. J. Xu,
a
and N. Hu
a
a College of Mechanical Engineering, Liaoning Technical University, Fuxin, China
b State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of
Technology, Dalian, China
c China National Coal Mining Equipment Co., Ltd, Beijing, China
ÓÄÊ 539.4
Èññëåäîâàíèå óñòàëîñòíîé äîëãîâå÷íîñòè áóðîâîãî äîëîòà ñ ðàçëè÷íûìè
ïàðàìåòðàìè ïðîåêòèðîâàíèÿ
Ê. Æàíã
à,á,â
, Ì. Æ. Êñó
à
, Í. Õó
à
à Ôàêóëüòåò ìàøèíîñòðîåíèÿ, Ëÿîíèíñêèé òåõíè÷åñêèé óíèâåðñèòåò, Ôóêñèí, Êèòàé
á Ãîñóäàðñòâåííàÿ ëàáîðàòîðèÿ ñòðóêòóðíîãî àíàëèçà äëÿ ïðîìûøëåííîãî îáîðóäîâàíèÿ,
Äàëÿíñêèé òåõíîëîãè÷åñêèé óíèâåðñèòåò, Äàëÿí, Êèòàé
â Êèòàéñêàÿ íàöèîíàëüíàÿ êîìïàíèÿ Êîàë Ìàéíèíã Ýêâèïìåíò Ëòä., Ïåêèí, Êèòàé
Ñ öåëüþ èññëåäîâàíèÿ óñòàëîñòíîé äîëãîâå÷íîñòè áóðîâîãî äîëîòà ñ ðàçëè÷íûìè ïàðàìåò-
ðàìè òåõíîëîãè÷åñêîãî ïðîåêòèðîâàíèÿ ïðîâåäåíî ìîäåëèðîâàíèå ïðîöåññà ïîäðåçêè óãîëü-
íîãî ïëàñòà ñ ïîìîùüþ äîëîòà íà îñíîâå òâåðäîòåëüíîé ìîäåëè. Èçìåíåíèå íàïðÿæåíèÿ â
ñîåäèíåíèè ìåæäó ëîïàòêîé è òâåðäîñïëàâíîé ãîëîâêîé ïîëó÷èëè ïóòåì ìîäåëèðîâàíèÿ
ïðîöåññà ïðîåêòèðîâàíèÿ ïðè ðàçëè÷íûõ ïàðàìåòðàõ ðàçðàáîòêè ñëàáîãî ñîåäèíåíèÿ (óãîë
ïîäðåçêè, òîëùèíà è øàã äîëîòà). Óñòàëîñòíóþ äîëãîâå÷íîñòü äîëîòà ïðîãíîçèðîâàëè ñ
ïîìîùüþ óñîâåðøåíñòâîâàííîãî ìåòîäà äîæäåâîãî ïîòîêà è ïðàâèëà Ìàéíåðà. Ñîãëàñíî
äàííûì èñïûòàíèé íà óñòàëîñòü çíà÷åíèÿ àìïëèòóäû íàïðÿæåíèé è íàêîïëåíèÿ ïîâðåæ-
äåíèé çà îäèí õîä ÿâëÿþòñÿ íàèìåíüøèìè ïðè óãëå ïîäðåçêè 80�, ïðè ýòîì êîëè÷åñòâî ðàáî÷èõ
õîäîâ è ÷àñîâ ïîâðåæäåííîãî äîëîòà äîñòèãàåò ìàêñèìóìà. ×åì òîëùå äîëîòî, òåì áîëüøå
åãî ñîïðîòèâëåíèå è òåì çíà÷èòåëüíåå ïîâðåæäåíèå. Êðîìå òîãî, ÷åì ìåíüøå øàã äîëîòà,
òåì ïðîùå åãî ñïðîåêòèðîâàòü è òåì ìåíüøå ïîâðåæäåíèå. Ðåçóëüòàòû èñïûòàíèé ñîîò-
âåòñòâóþò äàííûì òåîðåòè÷åñêîãî àíàëèçà.
Êëþ÷åâûå ñëîâà: äîëîòî, óñòàëîñòíàÿ äîëãîâå÷íîñòü, óñîâåðøåíñòâîâàííûé ìåòîä
äîæäåâîãî ïîòîêà, øàã äîëîòà, òîëùèíà äîëîòà, óãîë ïîäðåçêè.
Introduction. Coal planer cuts the coal rock by continuous cyclical impact of chain
haulage. Figure 1 shows the plow chart, whose cutting coal tool is the plow bit, However,
the plow is easily damaged in the form of the weld fracture and carbide head shedding, etc,
which directly affects the work reliability and coal production efficiency [1–9]. To figure
out the flow damaged causes of the sliding coal planner, effective measures have been
taken to reduce energy consumption and loss of plow by studying the loading behavior of
the working plow. Figure 2 depicts the plow bit physical map. Due to the environmental
conditions, coal properties and the interaction between coal and plow, computer numerical
simulation is combined with lab experiments to investigate the strength and fatigue life of
plow bit under different planning parameters, which is of significance for improving the
work reliability of the plow.
© Q. ZHANG, M. J. XU, N. HU, 2014
132 ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2
In order to explore the stress condition of the working plow, its strength and fatigue
life, a solid model for the plow bit is constructed using the material model of a flexible
body (MAT-PLASTIC-KINEMATIC). In addition, a constitutive model for the coal is
established based on the non-grid smoothed particle hydrodynamics (SPH). By selecting
the joint between the blade and carbide head as the weak location, the process of plow bit
cutting a coal seam is simulated by the Hyper Mesh and LS-DYNA, whose results are
analyzed in a combination with the test results. This paper provides a new method to study
the working conditions of a coal seam-cutting plow pit, as well as the strength and fatigue
life of a plow bit.
1. Establishment of the Plow Cutting Coal Seam.
1.1. Plow Bit Model. As the plow bit is complex in structure and subject to three-way
random loading in actual work, Pro/E software is used for modeling, and SD Solid 164 unit
type and flexible body material model is applied for the finite element simulation. Figure 3
shows the plow meshing with 57,913 units and 11,696 nodes, while Fig. 4 illustrates the
finite element model of plow bit and coal seam. Blade materials and their mechanical
properties are tabulated in Table 1.
1.2. Constitutive Model of Coal Seam. The accuracy of the finite element analysis
strongly depends on the material and the material parameters used in the model. Modeling
by SPH method can simply and accurately achieve complex constitutive behavior, such as
simulating structural disintegration, fragmentation and cratering, as well as the spall and
brittle fracture of solids, etc. In this method, the kernel estimation of any macroparameter
Study on Fatigue Life of Plow Bit ...
ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2 133
Fig. 1. Plow chart. Fig. 2. Plow bit physical map.
Fig. 3. Model of plow bit. Fig. 4. Finite element model of plow bit
and coal seam.
(e.g., density, pressure, temperature) in one spatial point (r), can be obtained by the integral
of f r( ) in � domain
f x f r W r r h dr( ) ( ) ( ; ) ,� � � � ��
�
(1)
where W r r h( ; )� � is a kernel function and h is the smoothing length.
Generally, f x( ) is called a kernel estimate of f r( ). Let f j be the value of particle
j in f r( ), Eq. (1) can be written in the form of particle summation
f x
m f
h
W
r r
h
j j
jj
N
ij
i j
( )
| |
,�
��
�
�
�
�
�
1
(2)
where N is the total number of particles in computational domain, m j , f j , and � j are
the quality, the parameter to be calculated, and the density of particle j in the spatial point
(r), respectively. Similarly, the kernel estimation of the first derivative of f r( ) in particle i
can be denoted by
�
� �
f
x
m f
h
W
x x
r r
i
i
x
j j
jj
N
ij
i
x
j
x
i j
� �
�
�
�
�
1
| |
( , , ).s x y z� (3)
The most common smooth kernel used in SPH is the cubic b-spline, defined as
Wij �
� � � �
� � �
( . . ) ( ),
. ( ) ( ),
(
1 1 5 0 75 0 1
0 25 2 1 2
0
2 3
3
� � � �
� � �
��
�
�
�
�
�
2),
(4)
where �� �| | ,r r hi j and � is selected as �� 1 5. ,h � �� 0 7 2. ,h and � �� h3
corresponding to the one-, two-, and three-dimensional problems, respectively.
Due to the brittle fracture of a coal-cutting plow bit, model 13# with brittle cracking
material is chosen in LS-DYNA as the elastic-plastic material fracture model (MAT-
ISOTROPIC-ELASTIC-FAILURE), where the shear modulus of 1190 MPa, the bulk
modulus of 2580 MPa, the plastic reinforcement modulus of 100 MPa, Poisson’s ratio of
0.3, and plastic fracture strain of 0.06.
2. Fatigue Life Prediction of Plow Bit for Different Planning Parameters.
2.1. Impact of Cutting Angle on Fatigue Life. Let the planning speed v� 25. m/s,
planning depth h� 20 mm, and plow thickness b� 30 mm. The cutting angle is obtained
by simulating the model using LS-DYNA. The changing curves of the shear stress with the
Q. Zhang, M. J. Xu, and N. Hu
134 ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2
T a b l e 1
Mechanical Characteristics of Investigated Materials
Blade material Elastic modulus
E, MPa
Poisson’s ratio
�
Yield strength
�s , MPa
Density
�, g/cm3
40Cr 210 105. � 0.25 980 8.3
YG8 5 40 105. � 0.30 1890 14.5
HL105 3 78 105. � 0.28 330 1.3
cutting angle of 70, 80, and 90� are extracted for statistical treatment. Let stress of i be x,
then mean value x , mean square deviation S , and variation coefficient t in the whole
planning process can be calculated as
x
n
xi
i
n
�
�
�
1
1
, (5)
S
n
x xi
i
n
� �
�
�
�
�
�
1 2
1
1 2
( ) ,
/
(6)
t
S
x
� . (7)
The statistical result of the stress at the joint between the blade and carbide head,
which was calculated via the MATLAB program is shown in Table 2 the fatigue life of the
plow bit is predicted using the improved rain-flow method and Miner linear accumulated
fatigue damage model. The statistical result is expressed by stress amplitude and vector
quantity, isofar as the rain-flow counting method involves two parameters. However, the
MATLAB program is used to improve the rain-flow program, thus avoiding the leaking
points caused by improper docking. The stress amplitudes of a stroke are shown in Fig. 5
with working face length being 100 m at the cutting angle of 70, 80, and 90�, respectively.
The power function of S N� curve is used to predict the fatigue life for different
cutting angles, defined as NS Cm � , where N is the cycle index of fatigue failure at stress
ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2 135
Study on Fatigue Life of Plow Bit ...
T a b l e 2
Statistical Result of the Stress at the Joint between the Blade and Carbide Head
Parameter Cutting angle �, deg
70 80 90
� max , MPa 59.1656 49.0864 59.973
� min , MPa 1.7760 1.4730 1.793
�mean , MPa 51.4163 40.0650 56.434
Mean-square deviation S 31.924 20.912 35.841
Variation coefficient t 0.627 0.612 0.782
a b c
Fig. 5. Stress amplitude circulation chart of plow bit for different cutting angles �: (a) � � �70 ;
(b) � � �80 ; (c) � � �90 .
level S , where m and C are the material constants which, according to studies [12, 13],
are set as m� 7.31 and C � �1 422917 1019. , respectively. Based on the Miner linear
accumulated fatigue damage, the accumulated damage D and the fatigue life of the plow
bit can be calculated under the random loading, with damage occurring at D� 1,
D
n
N
i
ii
r
� �
�
�
1
1, (8)
where ni is the cycle number at a certain stress level and N i is fatigue life at the stress.
Let the working time of coal planner be 18 h per day, total work time of a damaged
plow bit is shown in Table 3.
136 ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2
Q. Zhang, M. J. Xu, and N. Hu
T a b l e 3
Cumulative Damage and Fatigue Life of Plow Bit
Parameter Cutting angle �, deg
70 80 90
Cumulative damage of a stroke 2 84551 10 5. � � 2 422917 10 5. � � 3 73459 10 5. � �
Number of working strokes
with a damaged plow bit
3 5591 104. � 3 9687 104. � 2 7645 104. �
Number of working hours of plow
with a damaged plow bit
47.6 52.8 34.5
T a b l e 4
Statistical Results on Stress at the Joint between the Blade and Carbide Head
Parameter Plane width bp , mm
25 30 40
� max , MPa 38.8978 49.0864 58.8924
� min , MPa 0.7780 1.4730 3.8890
�mean , MPa 31.2416 40.0650 46.2350
Mean-square deviation S 19.568 20.912 35.841
Variation coefficient t 0.5270 0.6120 0.7172
T a b l e 5
Cumulative Damage and Fatigue Life of Plow Bit
Parameter Plane width bp , mm
25 30 40
Cumulative damage of a stroke 19153 10 5. � � 2 422917 10 5. � � 3 4531 10 5. � �
Number of working strokes with a damaged
plow bit
4 0125 104. � 3 9687 104. � 2 8102 104. �
Number of working hours of plow
with a damaged plow bit
53.40 52.80 35.12
2.2. Impact of Plane Width on Fatigue Life. Let the planning speed be v� 2.5 m/s,
planning depth h� 20 mm, and cutting angle �� �80 . Plane width bp is obtained as 25,
30, and 40 mm by simulating the model using LS-DYNA. After statistical processing of the
stress curve according to the method described in Section 2.1, the result is obtained via the
MATLAB program, as is shown in Table 4. Using the improved rain-flow method and the
ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2 137
Study on Fatigue Life of Plow Bit ...
T a b l e 6
Statistical Results on Stress at the Joint between the Blade and Carbide Head
Parameter Plane distance S p , mm
30 40 50
� max , MPa 45.1253 49.0864 62.583
� min , MPa 1.358 1.473 3.478
�mean , MPa 38.469 40.065 45.987
Mean-square deviation S 15.987 20.912 23.120
Variation coefficient t 0.589 0.612 0.788
T a b l e 7
Cumulative Damage and Fatigue Life of Plow Bit
Parameter Plane distance S p , mm
30 40 50
Cumulative damage of a stroke 2 0455 10 5. � � 2 422917 10 5. � � 4 2369 10 5. � �
Number of working strokes with a damaged
plow bit
4 2519 104. � 3 9687 104. � 2 3645 104. �
Number of working hours of plow
before damage
54.60 52.80 30.21
a b c
Fig. 6. Stress amplitude circulation chart of plow bit for different plane width values bp: (a) bp �
� 25 mm; (b) bp � 30 mm; (c) bp � 40 mm.
a b c
Fig. 7. Stress amplitude circulation chart of plow bit for different values of the plane distance S p:
(a) S p � 30 mm; (b) S p � 40 mm; (c) S p � 50 mm.
Miner linear accumulated fatigue damage model, the stress amplitude of the blow per one
stroke is shown in Fig. 6 and tabulated in Table 5 for the working face length of 100 m,
after obtaining the three plane width values by the processing of the LS-DYNA-simulated
stress curve.
2.3. Impact of Plane Distance on the Fatigue Life. Let the planning speed v� 2.5 m/s,
planning depth h� 20 mm, cutting angle �� �80 , and plow thickness bp � 30 mm. By the
LS-DYNA model simulation, the plane distances S p equal to 30, 40, and 50 mm,
respectively, were obtained. Using the statistical method described in Section 2.1 and the
MATLAB program, the statistical results on the stress values at the joint between the blade
and carbide head were obtained, which are tabulated in Table 6 and depicted in Fig. 7.
Using the improved rain-flow method and the Miner linear accumulated fatigue
damage model, the stress amplitude of the blow per one stroke was obtaine with the
working face length of 100 m, after obtaining the three plane distance values by the
processing of the LS-DYNA stress curve, as is shown in Fig. 7. Assuming the working time
of coal planner to be 18 h per day, the total work time of the plow with a damaged plow bit
is given in Table 7.
3. Experimental Study for Different Planning Parameters. Due to the limit
conditions, the experiment adopts the plot thickness as 25 mm, with the physical property
parameters given in Table 8.
The orthogonal experiment can be used to simulate the impact of error factors and
analyze the data obtained by fewer experiments, thus achieving a satisfactory result.
4. Orthogonal Factors’ Table. The orthogonal experiment is used through L9 (34)
without considering the interaction, as shown in Table 9, where A is the cutting angle,
B is the plow thickness, and Ñ is the plow spacing.
Figure 8 presents the overview of coal or rock specimens used, and Fig. 9 illustrates
the test analysis system. The number of working strokes and the total working time are
obtained from the experiment, as is shown in Fig. 10.
138 ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2
Q. Zhang, M. J. Xu, and N. Hu
T a b l e 8
Parameters of Physical Properties of Specimens
Speci-
men
type
Compres-
sive
strength
(MPa)
Tensile
strength
(MPa)
Shear
strength
(MPa)
Cohesio
n
(MPa)
Friction
angle
(deg)
Friction
coefficie
nt
Static
elastic
modulus
(MPa)
Pois-
son’s
ratio
Bulk
density
(kg/m3)
f0.4 40 4.015 16.54 12.1 65.1 2.6 1023 104. � 0.225 2004
f0.8 80 4.121 18.31 15.9 70.2 2.8 5 826 104. � 0.275 2112
f1.2 120 6.213 19.72 16.3 72.5 3.2 7 541 104. � 0.312 2480
T a b l e 9
Design of Orthogonal Experiment Array Experimental Design
Test number A B C D E F G H I
a 1 2 3 1 2 3 1 2 3
b 1 1 1 2 2 2 3 3 3
c 1 2 3 2 3 1 3 1 2
There are two groups in the orthogonal experiment (planning cutting angle �� �80 ,
plow thickness bp � 25 mm, and plow spacing S p � 40 mm), while the results obtained
are lower than the theoretical values, due to the impact of dynamic loading on the plow
abrasion. The theoretical results generally agree with the test data.
C o n c l u s i o n s
1. A three-dimensional solid model of the plow pit and the finite element model of the
coal are constructed, which provide some guidelines for simulating the coal-cutting plow
bit and predicting the plow bit fatigue life.
2. According to the simulation results, the shear stress strongly depends on the cutting
angle. The stress amplitude and accumulated damage per one stroke attain the minimal
values at the cutting angle of 80�, whereas the number of working strokes and working
hours reach the maximum values. The thicker is the plow bit, higher are the coal resistance
and the plow bit damage. In addition, a smaller plow spacing results in higher planning
ability and smaller damage.
3. The orthogonal experiment results show that the measured number of working
stokes and working time of plow basically agree with the respective results of the
theoretical analysis.
Ð å ç þ ì å
²ç ìåòîþ äîñë³äæåííÿ äîâãîâ³÷íîñò³ â³ä óòîìëåíîñò³ áóðîâîãî äîëîòà ç ð³çíèìè
ïàðàìåòðàìè òåõíîëîã³÷íîãî ïðîåêòóâàííÿ ïðîâåäåíî ìîäåëþâàííÿ ïðîöåñó ï³äð³çêè
ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2 139
Study on Fatigue Life of Plow Bit ...
Fig. 8. A coal or rock specimen. Fig. 9. Test analysis system.
a b
Fig. 10. Cumulative damage (a) and fatigue life (b) of the plow bit test.
âóã³ëüíîãî ïëàñòà çà äîïîìîãîþ äîëîòà íà îñíîâ³ òâåðäîò³ëüíî¿ ìîäåë³. Çì³íó íàïðó-
æåííÿ â ç’ºäíàíí³ ì³æ ëîïàòêîþ ³ òâåðäîñïëàâíîþ ãîëîâêîþ îòðèìàëè øëÿõîì
ìîäåëþâàííÿ ïðîöåñó ïðîåêòóâàííÿ çà ð³çíèõ ïàðàìåòð³â ðîçðîáêè ñëàáêîãî ç’ºäíàí-
íÿ (êóò ï³äð³çêè, òîâùèíà ³ êðîê äîëîòà). Äîâãîâ³÷í³ñòü â³ä óòîìëåíîñò³ äîëîòà
ñïðîãíîçóâàëè çà äîïîìîãîþ óäîñêîíàëåíîãî ìåòîäó äîùîâîãî ïîòîêó ³ ïðàâèëà
Ìàéíåðà. Çã³äíî ç äàíèìè âèïðîáóâàíü íà óòîìó çíà÷åííÿ àìïë³òóäè íàïðóæåíü ³
íàêîïè÷åííÿ ïîøêîäæåíü çà îäèí õ³ä º íàéìåíøèìè ïðè êóò³ ï³äð³çêè 80�, ïðè öüîìó
ê³ëüê³ñòü ðîáî÷èõ õîä³â ³ ãîäèí ïîøêîäæåíîãî äîëîòà ñÿãຠìàêñèìóìó. ×èì òîâùå
äîëîòî, òèì á³ëüøèé éîãî îï³ð ³ òèì çíà÷í³øå ïîøêîäæåííÿ. Îêð³ì òîãî, ÷èì
ìåíøèé êðîê äîëîòà, òèì ïðîñò³øå éîãî ñïðîåêòóâàòè ³ òèì ìåíøå ïîøêîäæåííÿ.
Ðåçóëüòàòè âèïðîáóâàíü çá³ãàþòüñÿ ç äàíèìè òåîðåòè÷íîãî àíàë³çó.
1. X. M. Kang, G. X. Li, and Y. H. Zhi, “To minimize energy consumption as the goal to
optimize planning depth,” Coal Mining Machin., 9, 42–44 (2004).
2. X. M. Kang, G. X. Li, and Y. H. Zhi, “To set off the conveyor cargo area even as the
objective to optimize planning depth,” Mining Machin., 33, No. 2, 14–16 (2005).
3. X. H. Li, X. Liu, and L. Li, “Dynamic simulation of sliding coal plow under different
working conditions,” J. China Coal Soc., 35, No. 7, 1202–1207 (2010).
4. Z. R. Wang, X. Y. Xiong, H. Zhang, et al., “Study on conical pick cutting using
LS-DYN,” J. Vibr. Measur. Diagn., 30, No. 2, 163–210 (2010).
5. Q. Zhang, Y. F. Fu, Q. S. Song, et al., “Parameter optimization of lowest energy
consumption for plow based on artificial fish school algorithm,” J. Guangxi Univ.
(Natural Science Edition), 37, No. 2, 241–247 (2012).
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(Natural Science), 19, No. 5, 526–529 (2000).
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97-002 type plow bit,” J. Fuzhou Univ. (Natural Science Edition), 40, No. 2, 222–226
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Received 22. 11. 2013
140 ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2
Q. Zhang, M. J. Xu, and N. Hu
|
| id | nasplib_isofts_kiev_ua-123456789-112709 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0556-171X |
| language | English |
| last_indexed | 2025-12-07T18:04:24Z |
| publishDate | 2014 |
| publisher | Інститут проблем міцності ім. Г.С. Писаренко НАН України |
| record_format | dspace |
| spelling | Zhang, Q. Xu, M.J. Hu, N. 2017-01-26T18:45:10Z 2017-01-26T18:45:10Z 2014 Study on Fatigue Life of Plow Bit under Different Planning Parameters / Q. Zhang, M.J. Xu, N. Hu // Проблемы прочности. — 2014. — № 2. — С. 132-140. — Бібліогр.: 11 назв. — англ. 0556-171X https://nasplib.isofts.kiev.ua/handle/123456789/112709 539.4 In order to study the fatigue life of plow bit under
 different planning parameters, the process of
 plow bit cutting coal seam is simulated based on
 a solid model. The variation of the stress in the
 joint between the blade and carbide head is obtained
 by simulating the planning process with
 different planning parameters of the weak joint
 (cutting angle, plow thickness and plow spacing).
 The fatigue life of the plow bit is predicted
 using the improved rain-flow method and the
 Miner linear accumulated fatigue damage model.
 According to the experiment on plow bit life,
 the stress amplitude and accumulated damage in
 one stroke are the least at the cutting angle of
 80C, with the number of working strokes and
 working hours of a damaged plow bit reaching
 the maximum. The thicker the plow bit is, the
 larger is the resistance and higher is the damage.
 In addition, a smaller plow spacing implies a
 better planning ability and a smaller damage.
 The experimental data are consistent with the results
 of the theoretical analysis. С целью исследования усталостной долговечности бурового долота с различными параметрами технологического проектирования проведено моделирование процесса подрезки угольного пласта с помощью долота на основе твердотельной модели. Изменение напряжения в
 соединении между лопаткой и твердосплавной головкой получили путем моделирования
 процесса проектирования при различных параметрах разработки слабого соединения (угол
 подрезки, толщина и шаг долота). Усталостную долговечность долота прогнозировали с
 помощью усовершенствованного метода дождевого потока и правила Майнера. Согласно
 данным испытаний на усталость значения амплитуды напряжений и накопления повреждений за один ход являются наименьшими при угле подрезки 80, при этом количество рабочих
 ходов и часов поврежденного долота достигает максимума. Чем толще долото, тем больше
 его сопротивление и тем значительнее повреждение. Кроме того, чем меньше шаг долота,
 тем проще его спроектировать и тем меньше повреждение. Результаты испытаний соответствуют данным теоретического анализа. Із метою дослідження довговічності від утомленості бурового долота з різними
 параметрами технологічного проектування проведено моделювання процесу підрізки
 вугільного пласта за допомогою долота на основі твердотільної моделі. Зміну напруження в з’єднанні між лопаткою і твердосплавною головкою отримали шляхом
 моделювання процесу проектування за різних параметрів розробки слабкого з’єднання (кут підрізки, товщина і крок долота). Довговічність від утомленості долота
 спрогнозували за допомогою удосконаленого методу дощового потоку і правила
 Майнера. Згідно з даними випробувань на утому значення амплітуди напружень і
 накопичення пошкоджень за один хід є найменшими при куті підрізки 80, при цьому
 кількість робочих ходів і годин пошкодженого долота сягає максимуму. Чим товще
 долото, тим більший його опір і тим значніше пошкодження. Окрім того, чим
 менший крок долота, тим простіше його спроектувати і тим менше пошкодження.
 Результати випробувань збігаються з даними теоретичного аналізу. en Інститут проблем міцності ім. Г.С. Писаренко НАН України Проблемы прочности Научно-технический раздел Study on Fatigue Life of Plow Bit under Different Planning Parameters Исследование усталостной долговечности бурового долота с различными параметрами проектирования Article published earlier |
| spellingShingle | Study on Fatigue Life of Plow Bit under Different Planning Parameters Zhang, Q. Xu, M.J. Hu, N. Научно-технический раздел |
| title | Study on Fatigue Life of Plow Bit under Different Planning Parameters |
| title_alt | Исследование усталостной долговечности бурового долота с различными параметрами проектирования |
| title_full | Study on Fatigue Life of Plow Bit under Different Planning Parameters |
| title_fullStr | Study on Fatigue Life of Plow Bit under Different Planning Parameters |
| title_full_unstemmed | Study on Fatigue Life of Plow Bit under Different Planning Parameters |
| title_short | Study on Fatigue Life of Plow Bit under Different Planning Parameters |
| title_sort | study on fatigue life of plow bit under different planning parameters |
| topic | Научно-технический раздел |
| topic_facet | Научно-технический раздел |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/112709 |
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