Sensitivity of Crack Nucleation Parameters to the Geometric Imperfection

Naumenko, V. P.; Skrypnyk, Yu.D.

doi:10.1007/1-4020-4972-2_181

Cited by 4 publications

(2 citation statements)

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“…This has an important bearing on the practical implementation of the UM procedure for assessing ductile tearing in thin-sheet metals. Earlier we demonstrated by experimental examples [32,33] that an open circular hole of a specific size is the preferable geometric imperfection to avoid the complicated analysis of the transition in fracture behaviour from the "flat" to "slant" mechanism of crack extension. In specimens with this stress raiser, both nucleation and extension of the NFC occur by shear localisation, i.e.…”

Section: Original Stress Raisersmentioning

confidence: 99%

“…5b). This hole is treated as a small geometric imperfection ensuring that the fracture process occurs only by the mechanism of shear localisation [32,33] Table 1 are considered to be more constrained than the others. The low-constrained specimens include the MM(T)-1.0-2.0 specimens tested along (LT direction) and across (TL direction) the rolling direction.…”

Section: Fig (5) Problem Domains Abcd Attached To Different Loadingmentioning

confidence: 99%

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Displacement-Based Assessment of Ductile Tearing under Low-Constraint Conditions

Naumenko¹,

Lenzion²,

Limansky³

2008

TOMEJ

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This paper deals with several issues in the ductile tearing assessment relevant to the fracture criteria and test methods covering the determination of the crack growth resistance under low-constraint conditions. Specifically, the effects of the specimen geometry and size, type and length of the original stress raiser, boundary restraints, load biaxiality, loading history, and plastic anisotropy were studied experimentally. With regard to the problem of transferring crack growth data, our results demonstrate that underlying assumptions of the current concept of ductile tearing evoke a suspicion from different points of view. To clarify the reasons for a gap between the model descriptions and measurements, we put forward an innovative engineering concept enabling through-life assessment of the fracture process in sheet metals.

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Section: Original Stress Raisersmentioning

confidence: 99%

Section: Fig (5) Problem Domains Abcd Attached To Different Loadingmentioning

confidence: 99%