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DYNAMIC CRACK PROPAGATION AND CRACK ARREST BEHAVIOUR IN RELATION TO BRITTLE INTERGRANULAR AND CLEAVAGE FRACTURE
Author(s) -
Jaeckels H.,
Iung T.,
Pineau A.
Publication year - 1994
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.1460-2695.1994.tb00216.x
Subject(s) - materials science , intergranular corrosion , fracture toughness , fracture mechanics , crack growth resistance curve , cleavage (geology) , intergranular fracture , brittleness , crack closure , composite material , fracture (geology) , alloy
— Conventional mechanical tests and fracture mechanics experiments were carried out at – 196°C on a low alloy steel (A508 class 3) which was investigated under two different conditions: (i) a reference condition in which the failure mode was cleavage and (ii) an embrittled condition in which the fracture mode was either partly or predominantly intergranular fracture. These experiments, performed with a new specimen geometry, a ring specimen instrumented to measure also the crack velocity, were used to determine the fracture toughness at crack initiation ( K Ic ) and at crack arrest ( K Ia ). It is confirmed that the reduction in K Ic measured in the embrittled material is associated with the appearance of intergranular fracture. It is also shown that K Ia , determined by a static analysis decreases rapidly with crack velocity when the fracture mode is predominantly cleavage. On the other hand, K Ia , corresponding to intergranular fracture seems to be much less dependent on crack speed. This difference in the sensitivity of both modes of brittle fracture to crack velocity is briefly discussed.