Experimental Investigation on the Tensile Strength of Composite Laminates Containing Open and Filled Holes
An experimental study is performed to evaluate the effects of clamping pressure, friction, and washer size on the static performance of composite laminates with open and bolt-filled holes. The static tensile strength and failure behavior of composite laminates with an open hole and a bolt-fill...
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| Datum: | 2014 |
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Інститут проблем міцності ім. Г.С. Писаренко НАН України
2014
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| Zitieren: | Experimental Investigation on the Tensile Strength of Composite Laminates Containing Open and Filled Holes / X.L. Fan, W.J. Qin, T. Suo // Проблемы прочности. — 2014. — № 2. — С. 141-146. — Бібліогр.: 13 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859480425096806400 |
|---|---|
| author | Fan, X.L. Qin, W.J. Suo, T. |
| author_facet | Fan, X.L. Qin, W.J. Suo, T. |
| citation_txt | Experimental Investigation on the Tensile Strength of Composite Laminates Containing Open and Filled Holes / X.L. Fan, W.J. Qin, T. Suo // Проблемы прочности. — 2014. — № 2. — С. 141-146. — Бібліогр.: 13 назв. — англ. |
| collection | DSpace DC |
| container_title | Проблемы прочности |
| description | An experimental study is performed to evaluate
the effects of clamping pressure, friction, and
washer size on the static performance of composite
laminates with open and bolt-filled holes.
The static tensile strength and failure behavior
of composite laminates with an open hole and a
bolt-filled hole are analyzed and compared. Experimental
results show that the static tensile
strength of composite laminates is sensitive to
pre-existing damage of both open- or filled-hole
laminates. In contrast, a comparison between
the experimental results of open- and filled-hole
specimens proved that whether the hole is open
or filled has a feeble influence on the tensile-tensile
fatigue strength of studied composite laminates.
In comparison, however, it is found that
the inserted washer size, bolt clamping force,
and friction force strongly affect the tensile
strength of open- and filled-hole composite laminates.
Moreover, application of thicker washers
and hi-lock bolt will significantly increase
the static strength and fatigue life of composite
laminates with a bolt-filled hole.
Экспериментально оценено влияние силы зажима, трения и размера шайбы на статические
характеристики слоистых композитов со сквозными и болтовыми отверстиями. Проведено
сравнение статического предела прочности при растяжении и характера разрушения слоистых композитов со сквозным и болтовым отверстиями. Результаты экспериментальных
исследований показали, что на статический предел прочности при растяжении слоистых
композитов влияет изначальное повреждение независимо от наличия сквозного или болтового
отверстия. Сравнительный анализ результатов исследований образцов со сквозным и болтовым отверстиями подтвердил тот факт, что вид отверстия (сквозное или болтовое)
незначительно влияет на усталостную прочность при растяжении исследуемых слоистых
композитов. Установлено, что такие факторы, как размер шайбы, сила зажима болта и
сила трения, существенно влияют на предел прочности при растяжении слоистых композитов со сквозным или болтовым отверстием. Использование утолщенных шайб между
слоистым материалом и болтом-заклепкой значительно увеличивает статическую прочность и долговечность слоистых композитов с болтовыми отверстиями.
Експериментально досліджено вплив сили затиску, тертя і розміру шайби на статичні
характеристики шаруватих композитів із наскрізними і болтовими отворами. Проведено порівняння статичної границі міцності при розтязі і характера руйнування
шаруватих композитів із наскрізними і болтовими отворами. Результати експериментальних досліджень показали, що на статичну границю міцності при розтязі
шаруватих композитів впливає початкове пошкодження незалежно від наявності
наскрізного чи болтового отвору. Порівняльний аналіз результатів досліджень зразків із наскрізними і болтовими отворами підтвердив той факт, що вид отвору
(наскрізне чи болтове) незначно впливає на міцність від утомленості при розтязі
досліджуваних шаруватих композитів. Установлено, що такі чинники, як розмір
шайби, сила затиску болта і сила тертя, суттєво впливають на границю міцності при
розтязі шаруватих композитів із наскрізним чи болтовим отвором. Використання
стовщених шайб між шаруватим матеріалом і болтом-заклепкою значно збільшує
статичну міцність і довговічність шаруватих композитів із болтовими отворами
|
| first_indexed | 2025-11-24T12:13:52Z |
| format | Article |
| fulltext |
UDC 539.4
Experimental Investigation on the Tensile Strength of Composite Laminates
Containing Open and Filled Holes
X. L. Fan,
a,b,1
W. J. Qin,
a
and T. Suo
b
a State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace
Engineering, Xi’an Jiaotong University, Xi’an, China
b School of Aeronautics, Northwestern Polytechnical University, Xi’an, China
1 fanxueling@mail.xjtu.edu.cn
ÓÄÊ 539.4
Ýêñïåðèìåíòàëüíîå èññëåäîâàíèå ïðåäåëà ïðî÷íîñòè ïðè ðàñòÿæåíèè
ñëîèñòûõ êîìïîçèòîâ ñî ñêâîçíûìè è áîëòîâûìè îòâåðñòèÿìè
Ñ. Ë. Ôàí
à,á,1
, Â. Æ. Êèí
à
, Ò. Ñóî
á
à Íàöèîíàëüíàÿ ëàáîðàòîðèÿ ïðî÷íîñòè è êîëåáàíèé ìåõàíè÷åñêèõ êîíñòðóêöèé,
ôàêóëüòåò àâèàöèîííî-êîñìè÷åñêîé òåõíèêè, Óíèâåðñèòåò Ñèàíü Öçÿîòóí, Ñèàíü,
Êèòàé
á Ôàêóëüòåò àýðîíàâòèêè, Ñåâåðî-çàïàäíûé ïîëèòåõíè÷åñêèé óíèâåðñèòåò, Ñèàíü, Êèòàé
Ýêñïåðèìåíòàëüíî îöåíåíî âëèÿíèå ñèëû çàæèìà, òðåíèÿ è ðàçìåðà øàéáû íà ñòàòè÷åñêèå
õàðàêòåðèñòèêè ñëîèñòûõ êîìïîçèòîâ ñî ñêâîçíûìè è áîëòîâûìè îòâåðñòèÿìè. Ïðîâåäåíî
ñðàâíåíèå ñòàòè÷åñêîãî ïðåäåëà ïðî÷íîñòè ïðè ðàñòÿæåíèè è õàðàêòåðà ðàçðóøåíèÿ ñëîèñ-
òûõ êîìïîçèòîâ ñî ñêâîçíûì è áîëòîâûì îòâåðñòèÿìè. Ðåçóëüòàòû ýêñïåðèìåíòàëüíûõ
èññëåäîâàíèé ïîêàçàëè, ÷òî íà ñòàòè÷åñêèé ïðåäåë ïðî÷íîñòè ïðè ðàñòÿæåíèè ñëîèñòûõ
êîìïîçèòîâ âëèÿåò èçíà÷àëüíîå ïîâðåæäåíèå íåçàâèñèìî îò íàëè÷èÿ ñêâîçíîãî èëè áîëòîâîãî
îòâåðñòèÿ. Ñðàâíèòåëüíûé àíàëèç ðåçóëüòàòîâ èññëåäîâàíèé îáðàçöîâ ñî ñêâîçíûì è áîëòî-
âûì îòâåðñòèÿìè ïîäòâåðäèë òîò ôàêò, ÷òî âèä îòâåðñòèÿ (ñêâîçíîå èëè áîëòîâîå)
íåçíà÷èòåëüíî âëèÿåò íà óñòàëîñòíóþ ïðî÷íîñòü ïðè ðàñòÿæåíèè èññëåäóåìûõ ñëîèñòûõ
êîìïîçèòîâ. Óñòàíîâëåíî, ÷òî òàêèå ôàêòîðû, êàê ðàçìåð øàéáû, ñèëà çàæèìà áîëòà è
ñèëà òðåíèÿ, ñóùåñòâåííî âëèÿþò íà ïðåäåë ïðî÷íîñòè ïðè ðàñòÿæåíèè ñëîèñòûõ êîìïî-
çèòîâ ñî ñêâîçíûì èëè áîëòîâûì îòâåðñòèåì. Èñïîëüçîâàíèå óòîëùåííûõ øàéá ìåæäó
ñëîèñòûì ìàòåðèàëîì è áîëòîì-çàêëåïêîé çíà÷èòåëüíî óâåëè÷èâàåò ñòàòè÷åñêóþ ïðî÷-
íîñòü è äîëãîâå÷íîñòü ñëîèñòûõ êîìïîçèòîâ ñ áîëòîâûìè îòâåðñòèÿìè.
Êëþ÷åâûå ñëîâà: ïðåäåë ïðî÷íîñòè ïðè ðàñòÿæåíèè, áîëòîâîå îòâåðñòèå, ñèëà çàæè-
ìà, óñòàëîñòü.
Introduction. It is well-known that composite laminates are sensitive to stress
concentration. The most common method of assembling composite structures is by the use
of mechanical fasteners, which leads to the development of stress concentration at the hole
edges. The defect-induced stress concentration causea a substantial reduction in the
strength of composite laminates. Therefore, prediction of strength reduction due to these
locally high stress levels is of great practical interest.
A considerable scope of research data exists concerning the effect of holes on the
strength of composite laminates [1–6]. An excellent summary of mechanics of mechanically
fastened joints in polymer-matrix composite structures is given in works [7, 8]. Camanho
and Matthews [7] gave a comprehensive review of mechanically fastened joints in
© X. L. FAN, W. J. QIN, T. SUO, 2014
ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2 141
fiber-reinforced plastics. Thoppul et al. [8] presented a thorough review of the literature
including test standards, failure modes and prediction, effects of environmental conditions,
time-dependent relaxation of joints, and nondestructive evaluation techniques. The
mechanical behavior of a filled-hole composite laminates is different and more complicated
than that of the open-hole ones. In order to numerically study the stress and failure
developments of laminates containing a filled hole, several simplified models were
proposed [9, 10]. For example, Dano et al. [10] developed a progressive damage model to
study the effects of failure criteria and damage model on the mechanical behavior of
filled-hole composite laminates, which was implemented in the ABAQUS commercial
software. While the stress and failure modes of composite laminates containing holes has
been studied and reported extensively, there are few works concerning the comparative
study of the effect of washer size on static and fatigue strength values of composite
laminates containing holes [11–13]. There are additional effects to be considered, such as
the effect of washer size, the related clamping force and friction on the strength of
filled-hole composite laminates.
Since assembled composite structures are most frequently used in aircraft and
aerospace components, and filled-hole tension may be a critical design consideration for
composite materials, it is vital to understand the mechanical behavior of open- and
filled-hole composites subjected to static tensile or cyclic tensile-tensile loading conditions.
As a contribution to this need, the objective of the present paper is to experimentally study
the tensile static and fatigue strength values of composite laminates containing open and
filled holes.
Problem Statement. Consider a composite laminate specimen made from fiber-
reinforced unidirectional plies, containing a central circular hole with diameter D, as shown
in Fig. 1, where the specimen length, width, and thickness are designated as L, W , and t ,
respectively. Four basic ply orientation directions (0, 90, �45, and � �45 ) are selected and
indicated in Fig. 1. Open- and filled-hole tension tests of balanced symmetric laminates
(with respect to the middle surface) are performed to determine the notched laminate tensile
strength. In case of an open-hole tension test, no constraint is imposed on the hole. In
contrast, for the filled-hole test, in order to distribute the clamp-up load, a bolt is placed
into the laminate hole with two thick washers inserted between the laminate and the bolt
head/tail. An in-plane tensile load P is applied to the composite laminate which leads to
the laminate deformation in a net-tension mode in its own plane. Failure occurs when the
laminate cannot sustain any additional load.
Experimental. In this section, uniaxial tensile experiments of balanced symmetric
laminates are performed to examine the tensile strength of composite laminates with a
central circular hole of 6.35 mm diameter. The issues of practical interest, such as the
washer thickness efffect of the tensile strength, are addressed. The specimen preparation
and material properties are described below.
X. L. Fan, W. J. Qin, and T. Suo
142 ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2
Fig. 1. Geometry of a composite laminate specimen containing a circular filled hole.
Specimen Preparation and Testing. The laminate plate contained sixteen plies of
identical orthotropic material with the stacking sequence [ / / / /� � � � �45 0 45 90 � � � � �45 0 45 0/ / / ]s .
The number in the stacking sequence indicates the in-plane rotation angle of each ply
relative to the reference 0� ply (coinciding with the fiber direction). The nominal plate
thickness h equals to 2 mm. The ply thickness is nominally 0.125 mm. The specimens
contain 6.35 mm diameter holes and are 38 mm wide and 250 mm long. A 3 mm thick
washer is inserted between the composite laminates and the raised head bolt. Alternatively,
nut washers of 2 and 3 mm thickness were used. A uniform clamping pressure is transferred
to the composite through these washers. The in-plane geometry of these washers is
20 20� mm. The total washer surfaces are flattened, in order to ensure the maximum
contact of the washer surface to composite plates.
Both open- and filled-hole tensile loading tests were performed until the full failure
occured. The head travel and load on the specimen were recorded during the test. The test
machine wedge grips had the same width as the specimen, as shown in Fig. 1. The tensile
strength is presented in terms of the gross-area strength.
Experimental Results. To determine the failure load of structure details static tensile
tests were carried out firstly, which could be used as the basic reference data for
determination of the maximum load under the cyclic loading conditions. The net stress and
strain distributions were obtained based on the strain measurements of the quasistatic test.
Table 1 shows the experimental results on static strength of filled hole laminates,
where the gross and net cross-sectional areas are equal to Wh and ( ) ,W D h� respectively.
A typical fracture morphology of specimens with a filled hole is characterized by the
nonuniform fracture patterns due to the existence of � �45 plies in the composite laminates.
Comparison of statistical strength values of open- and filled-hole laminates is given in
Table 2, where the mean values are calculated from 5 valid experimental data with the
coefficient of variation CV � 0 03. . The corresponding strain values are calculated by using
the linear elastic theory with the tensile modulus of 70.5 GPa.
It is obvious that the existence of a filled hole would strongly reduce the static
strength of the laminates. In contrast, the threshold value for the filled hole laminate is not
much different from that of laminates without holes.
In case of a relatively high ratio of the maximum cycle load and the static failure load,
the laminates can endure more than 106 tension-tension cycles before fracture. Therefore,
the effect of damage, such as filled hole, on the fatigue life of studied laminates is not
significant. However, the static strength is strongly dependent on the damage situation. In
this case, the fatigue strength can be assumed to be a certain share of the static strength,
such as 80%, and no additional fatigue tests are performed.
High durability for a high ratio of the maximum cycle load and the static failure load
will lead to some difficulties in the determination of load levels since much larger fatigue
Experimental Investigation on the Tensile Strength ...
ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2 143
T a b l e 1
Static Strength of Filled-Hole Composite Laminates
Specimen Failure load
Pb , N
Gross tensile strength
�b1 , MPa
Net tensile strength
�b2 , MPa
1 38.1 501.7 602.5
2 40.8 537.1 645.0
3 41.0 539.6 647.9
4 39.6 521.9 626.8
5 40.4 532.3 639.2
life scatter will be induced by the given static strength scatter. The clamping pressure of the
hi-lock bolt will also exert effects on the fatigue life of filled-hole laminates, which implies
a higher scatter of the fatigue life data.
Based on the experiments, it is found that the inserted washers have the most
significant effect on the tensile strength of filled-hole laminates. These effects can be
subdivided into the following four categories.
1. The static tensile strength is sensitive to the thickness of washers. The experimental
data show that, in presence of washers on both side of laminates, the mean values of failure
load and the gross cross-sectional static tensile strength are 40 kN and 526.5 MPa,
respectively. In comparison, in presence of nut washers only, the failure load and tensile
strength are reduced remarkably, as shown in Table 3.
2. The experimental results show that after about ten thousands of cycles delaminations
will appear at the interface of 45�/90� or 90�90/� �45 plies, which originate from the
specimen edges and propagate towards the specimen center until approaching the washers.
Since half of the width is pressurized by the washers, delaminations would be delayed and
the fatigue life would be significantly increased.
3. Due to the relatively high clamping pressure, friction between the washers and the
composite laminates is increased, which aggravates the temperature rise. In the experiments,
the maximum temperature was controlled to be less than 40�C, for which purpose the test
frequency was reduced.
4. Higher values of the clamping pressure and friction leads to obvious abrasion of the
composite laminates, manifested by the appearance of a bright wear surface with debris
consisting of small amounts of carbon powders.
144 ISSN 0556-171X. Ïðîáëåìû ïðî÷íîñòè, 2014, ¹ 2
T a b l e 2
Comparison of Strength Values for Defect-Free and Filled-Hole Laminates
Specimen Static strength Threshold value
for 106 cycles (R � 01. )
Mean value B-basis value Mean value B-basis value
No hole Failure stress, MPa 866 845 485 446
Failure strain
12284 11980 6884 6324
Filled
hole
Gross
section
Failure stress, MPa 526 474 445 433
Failure strain
7468 6722 6316 6144
Net
section
Failure stress, MPa 632 569 534 520
Failure strain
8969 8074 7574 7376
X. L. Fan, W. J. Qin, and T. Suo
T a b l e 3
Static Strength of Filled-Hole Composite Laminates with Nut Washers Only
Specimen Failure load
Pb , N
Gross tensile strength
�b1 , MPa
1 34.0 447.8
2 32.7 430.7
3 32.5 427.6
Mean value 33.1 435.4
Conclusions. The tensile strength of composite laminates with open and filled holes is
investigated experimentally in this work. Based on the experimental results, the following
conclusions can be made:
1. The static tensile strength of composite laminates may be reduced remarkably by
pre-existing defects. However, in contrast, under the investigated loading conditions the
fatigue threshold value is comparable for both types of damaged laminates.
2. In case of filled-hole laminates, both static and fatigue tensile strength values of
studied laminates are sensitive to the presence and thickness values of the inserted washers.
The experimental results indicate that application of thick washers between the laminates
and the hi-lock bolt improves the static strength and fatigue life of filled-hole laminates.
3. Delaminations are mostly observed near the stress concentration zone of the hole
region, whereas their number decreases with increase in the applied load and with the
number of loading cycles.
4. Washer-induced clamping pressure and friction are two critical factors, which
control the tensile strength of composite laminates.
Acknowledgments. This work is supported by the State 973 Program of China
(2013CB035700), and the National Natural Science Foundation of China (11272259,
11002104, and 11021202).
Ð å ç þ ì å
Åêñïåðèìåíòàëüíî äîñë³äæåíî âïëèâ ñèëè çàòèñêó, òåðòÿ ³ ðîçì³ðó øàéáè íà ñòàòè÷í³
õàðàêòåðèñòèêè øàðóâàòèõ êîìïîçèò³â ³ç íàñêð³çíèìè ³ áîëòîâèìè îòâîðàìè. Ïðî-
âåäåíî ïîð³âíÿííÿ ñòàòè÷íî¿ ãðàíèö³ ì³öíîñò³ ïðè ðîçòÿç³ ³ õàðàêòåðà ðóéíóâàííÿ
øàðóâàòèõ êîìïîçèò³â ³ç íàñêð³çíèìè ³ áîëòîâèìè îòâîðàìè. Ðåçóëüòàòè åêñïåðè-
ìåíòàëüíèõ äîñë³äæåíü ïîêàçàëè, ùî íà ñòàòè÷íó ãðàíèöþ ì³öíîñò³ ïðè ðîçòÿç³
øàðóâàòèõ êîìïîçèò³â âïëèâຠïî÷àòêîâå ïîøêîäæåííÿ íåçàëåæíî â³ä íàÿâíîñò³
íàñêð³çíîãî ÷è áîëòîâîãî îòâîðó. Ïîð³âíÿëüíèé àíàë³ç ðåçóëüòàò³â äîñë³äæåíü çðàç-
ê³â ³ç íàñêð³çíèìè ³ áîëòîâèìè îòâîðàìè ï³äòâåðäèâ òîé ôàêò, ùî âèä îòâîðó
(íàñêð³çíå ÷è áîëòîâå) íåçíà÷íî âïëèâຠíà ì³öí³ñòü â³ä óòîìëåíîñò³ ïðè ðîçòÿç³
äîñë³äæóâàíèõ øàðóâàòèõ êîìïîçèò³â. Óñòàíîâëåíî, ùî òàê³ ÷èííèêè, ÿê ðîçì³ð
øàéáè, ñèëà çàòèñêó áîëòà ³ ñèëà òåðòÿ, ñóòòºâî âïëèâàþòü íà ãðàíèöþ ì³öíîñò³ ïðè
ðîçòÿç³ øàðóâàòèõ êîìïîçèò³â ³ç íàñêð³çíèì ÷è áîëòîâèì îòâîðîì. Âèêîðèñòàííÿ
ñòîâùåíèõ øàéá ì³æ øàðóâàòèì ìàòåð³àëîì ³ áîëòîì-çàêëåïêîþ çíà÷íî çá³ëüøóº
ñòàòè÷íó ì³öí³ñòü ³ äîâãîâ³÷í³ñòü øàðóâàòèõ êîìïîçèò³â ³ç áîëòîâèìè îòâîðàìè.
1. A. Öndürücü, Ü. Esendemir, and R. F. Tunay, “Progressive failure analysis of
glass-epoxy laminated composite pinned-joints,” Mater. Design, 36, 617–625 (2012).
2. A. J. Sawicki and P. J. Minguet, “Failure mechanisms in compression-loaded composite
laminates containing open and filled holes,” J. Reinf. Plast. Compos., 18, No. 18,
1708–1728 (1999).
3. I. Eriksson and C. G. Aronsson, “Strength of tensile loaded graphite/epoxy laminates
containing cracks, open and filled holes,” J. Compos. Mater., 24, No. 5, 456–482
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Received 22. 11. 2013
X. L. Fan, W. J. Qin, and T. Suo
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| id | nasplib_isofts_kiev_ua-123456789-112718 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0556-171X |
| language | English |
| last_indexed | 2025-11-24T12:13:52Z |
| publishDate | 2014 |
| publisher | Інститут проблем міцності ім. Г.С. Писаренко НАН України |
| record_format | dspace |
| spelling | Fan, X.L. Qin, W.J. Suo, T. 2017-01-26T19:09:12Z 2017-01-26T19:09:12Z 2014 Experimental Investigation on the Tensile Strength of Composite Laminates Containing Open and Filled Holes / X.L. Fan, W.J. Qin, T. Suo // Проблемы прочности. — 2014. — № 2. — С. 141-146. — Бібліогр.: 13 назв. — англ. 0556-171X https://nasplib.isofts.kiev.ua/handle/123456789/112718 539.4 An experimental study is performed to evaluate the effects of clamping pressure, friction, and washer size on the static performance of composite laminates with open and bolt-filled holes. The static tensile strength and failure behavior of composite laminates with an open hole and a bolt-filled hole are analyzed and compared. Experimental results show that the static tensile strength of composite laminates is sensitive to pre-existing damage of both open- or filled-hole laminates. In contrast, a comparison between the experimental results of open- and filled-hole specimens proved that whether the hole is open or filled has a feeble influence on the tensile-tensile fatigue strength of studied composite laminates. In comparison, however, it is found that the inserted washer size, bolt clamping force, and friction force strongly affect the tensile strength of open- and filled-hole composite laminates. Moreover, application of thicker washers and hi-lock bolt will significantly increase the static strength and fatigue life of composite laminates with a bolt-filled hole. Экспериментально оценено влияние силы зажима, трения и размера шайбы на статические характеристики слоистых композитов со сквозными и болтовыми отверстиями. Проведено сравнение статического предела прочности при растяжении и характера разрушения слоистых композитов со сквозным и болтовым отверстиями. Результаты экспериментальных исследований показали, что на статический предел прочности при растяжении слоистых композитов влияет изначальное повреждение независимо от наличия сквозного или болтового отверстия. Сравнительный анализ результатов исследований образцов со сквозным и болтовым отверстиями подтвердил тот факт, что вид отверстия (сквозное или болтовое) незначительно влияет на усталостную прочность при растяжении исследуемых слоистых композитов. Установлено, что такие факторы, как размер шайбы, сила зажима болта и сила трения, существенно влияют на предел прочности при растяжении слоистых композитов со сквозным или болтовым отверстием. Использование утолщенных шайб между слоистым материалом и болтом-заклепкой значительно увеличивает статическую прочность и долговечность слоистых композитов с болтовыми отверстиями. Експериментально досліджено вплив сили затиску, тертя і розміру шайби на статичні характеристики шаруватих композитів із наскрізними і болтовими отворами. Проведено порівняння статичної границі міцності при розтязі і характера руйнування шаруватих композитів із наскрізними і болтовими отворами. Результати експериментальних досліджень показали, що на статичну границю міцності при розтязі шаруватих композитів впливає початкове пошкодження незалежно від наявності наскрізного чи болтового отвору. Порівняльний аналіз результатів досліджень зразків із наскрізними і болтовими отворами підтвердив той факт, що вид отвору (наскрізне чи болтове) незначно впливає на міцність від утомленості при розтязі досліджуваних шаруватих композитів. Установлено, що такі чинники, як розмір шайби, сила затиску болта і сила тертя, суттєво впливають на границю міцності при розтязі шаруватих композитів із наскрізним чи болтовим отвором. Використання стовщених шайб між шаруватим матеріалом і болтом-заклепкою значно збільшує статичну міцність і довговічність шаруватих композитів із болтовими отворами This work is supported by the State 973 Program of China (2013CB035700), and the National Natural Science Foundation of China (11272259, 11002104, and 11021202). en Інститут проблем міцності ім. Г.С. Писаренко НАН України Проблемы прочности Научно-технический раздел Experimental Investigation on the Tensile Strength of Composite Laminates Containing Open and Filled Holes Экспериментальное исследование предела прочности при растяжении слоистых композитов со сквозными и болтовыми отверстиями Article published earlier |
| spellingShingle | Experimental Investigation on the Tensile Strength of Composite Laminates Containing Open and Filled Holes Fan, X.L. Qin, W.J. Suo, T. Научно-технический раздел |
| title | Experimental Investigation on the Tensile Strength of Composite Laminates Containing Open and Filled Holes |
| title_alt | Экспериментальное исследование предела прочности при растяжении слоистых композитов со сквозными и болтовыми отверстиями |
| title_full | Experimental Investigation on the Tensile Strength of Composite Laminates Containing Open and Filled Holes |
| title_fullStr | Experimental Investigation on the Tensile Strength of Composite Laminates Containing Open and Filled Holes |
| title_full_unstemmed | Experimental Investigation on the Tensile Strength of Composite Laminates Containing Open and Filled Holes |
| title_short | Experimental Investigation on the Tensile Strength of Composite Laminates Containing Open and Filled Holes |
| title_sort | experimental investigation on the tensile strength of composite laminates containing open and filled holes |
| topic | Научно-технический раздел |
| topic_facet | Научно-технический раздел |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/112718 |
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