A study on the decrease of fracture resistance curve under reversed cyclic loading

Cyclic-tearing behaviour and J–R curves of Indian NPP pipes under displacement-controlled cyclic loading

“…These observations are in agreement with that reported in IPIRG programme and by many other investigators C.W. Marchall and G. Wilkowski [11], Chang et al [12,13] and Singh et al [14].…”

“…gðqÞJ pl dq (13) where, 'q o ' is initial half crack angle, 'q' is current half crack angle and f pl is plastic load point rotation. The Eq.…”

Translating the material fracture resistance into representations in welded tubular structures

“…The current study focuses on the data from small-scale yielding, high-constraint fracture specimens, in deriving the lower-bound J-R curve. The J-R curve data included in the current study covers a wide range of structural steels with various grades for different applications, comprising of the pressure and reactor vessel steels [37][38][39][40][41][42], pipe and pipeline steels [43][44][45][46][47][48], steels for other structural applications [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65] and weld materials [66,67].…”

Structural variations ahead of crack tip during monotonic and cyclic fracture tests of AISI 304LN stainless steel

“…Cyclic fracture toughness tests are usually aimed to assess the integrity of components during seismic events [1][2][3][4][5][6][7][8][9]. Though, there exists controversy over the applicability of the J-integral technique to compressive crack tip load-excursions that take place in such tests, several investigators [3][4][5][6][7][8] have examined the appropriateness of the concept of cyclic J-R curves using compact tension specimens.…”

“…Though, there exists controversy over the applicability of the J-integral technique to compressive crack tip load-excursions that take place in such tests, several investigators [3][4][5][6][7][8] have examined the appropriateness of the concept of cyclic J-R curves using compact tension specimens. The earlier researchers [4,[6][7][8][9] in this domain have unanimously illustrated that the fracture resistance of materials decreases upon imposition of compressive cyclic loads during conventional J-integral tests. The bulk damage mechanism of AISI 304LN stainless steel, considered for this investigation, subjected to cyclic fracture tests is primarily due to formation of voids, their smearing and re-sharpening of crack tip [7,9].…”