Effect of mixed mode loading on the crack propagation direction in hydrogen assisted cracking
The four-point bending tests were carried out in deionized water on the precracked specimens of high strength Ni-Cr-Mo steel, and the crack initiation time as well as the crack propagation direction in hydrogen assisted cracking (HAC) under mixed mode I–II loading were investigated. The crack propag...
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Published in | Engineering fracture mechanics Vol. 33; no. 1; pp. 133 - 141 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
1989
|
Subjects | |
Online Access | Get full text |
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Summary: | The four-point bending tests were carried out in deionized water on the precracked specimens of high strength Ni-Cr-Mo steel, and the crack initiation time as well as the crack propagation direction in hydrogen assisted cracking (HAC) under mixed mode I–II loading were investigated. The crack propagation angle
θ
p
, under mixed mode I–II loading increased with increase in the ratio of mode II to mode I stress intensity factor,
K
II/K
I
, both in HAC and unstable fracture in air, and the
θ
p
was a little larger in HAC than in unstable fracture in air. Crack initiation time in HAC,
t
1
, increased with increasing
K
II/K
I
, when
K
II/K
I
, was smaller than 0.8. The above experimental results were able to be explained by denning a hydrogen-assisted cracking function g̃s (r, θ) which was introduced by combining the tangential stress
σ
θ
, and the hydrogen concentration around crack tip. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0013-7944 1873-7315 |
DOI: | 10.1016/0013-7944(89)90061-1 |