Определение размеров трещин, соответствующих пределам выносливости металлов и сплавов при наличии концентрации напряжений

• Main Author: Хамаза, Л.А.
• Format: Article
• Language: Russian
• Published: Інститут проблем міцності ім. Г.С. Писаренко НАН України 2018
• Series: Проблемы прочности
• Subjects: Научно-технический раздел
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/173874

Based on the assumption that there exists a proportional relationship between the quantity √area, which characterizes the stress raiser size, and the size of crack at the endurance limit of a specimen with stress raiser, a procedure for the calculation of the size of such a crack is proposed. The size of non-propagating cracks at the endurance limit of specimens with stress raisers has been calculated for a number of structural materials using the proposed procedure and known data on endurance limit and defects of different size and shape, which are evaluated with the parameter √area. The effect of stress gradient and concentration on the crack size at the endurance limit of various materials is considered. It has been shown that the crack size at the endurance limit of specimens with defects firstly increases with increasing stress gradient and theoretical stress concentration factor and, secondly, always remains larger than the size of non-propagating crack, which is observed at the endurance limit of smooth specimen.