Localised prior strain-hardening increases the tearing resistance of ductile steel

Localised prior strain-hardening increases the tearing resistance of ductile steel
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局部预先应变硬化提高了球墨钢的抗撕裂性

DOI:
10.1016/j.ijmecsci.2018.10.002
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发表时间:
2019
影响因子:
7.3
通讯作者:
Coules H
Coules H
中科院分区:
工程技术1区
文献类型:
--
作者:
Coules H

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In structural materials, ‘intrinsic’ toughening originates from plastic dissipation of strain energy at the tips of cracks. This depends on a material's microstructure and its stress–strain response. By introducing a spatially-varying distribution of prior strain-hardening into a material, we can modify the stress field which develops around a crack as it is loaded, producing an increased resistance to ductile tearing. We demonstrate this toughening effect using synchrotron X-ray diffraction and digital image correlation measurements of the crack tip region in a ductile ferritic steel. Localised strain-hardening also introduces a residual stress, but this is shown not to contribute significantly to the initiation of tearing in this material.
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