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LEAK‐BEFORE‐BREAK CONDITIONS OF PLATES AND PIPES UNDER HIGH FATIGUE STRESSES
Author(s) -
Nam Ki Woo,
Ando Kotoji,
Yuzuru Sakai,
Ogura Nobukazu
Publication year - 1992
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1992.tb00058.x
Subject(s) - materials science , structural engineering , crack closure , fracture mechanics , penetration (warfare) , fatigue testing , leak , stress concentration , composite material , stress (linguistics) , crack tip opening displacement , engineering , linguistics , philosophy , operations research , environmental engineering
The leak‐before‐break(LBB) behaviour of a structural component under high fatigue stress, low‐cycle fatigue conditions is an important problem in nuclear power plants, liquid nitrogen gas tankers and chemical plants. This paper is an experimental study to clarify the crack shape at penetration, crack opening behaviour after penetration and the LBB condition for plate specimens and pipe specimens. The fatigue load which realizes the LBB condition, P F LBB' is based on a net‐stress criterion. It is found that P F LBB is dependent only on the initial crack length a 0 . Furthermore, it is shown that the crack opening displacement V at the centre of a penetrated crack can be derived using the gross stress, σ G' and the front surface crack length, a s' together with the back surface crack length, a b .