Layer thickness effect on ductile tensile fracture
Layer thickness effect on ductile tensile fracture
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DOI：
10.1007/bf02646603
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发表时间：
1993-07
期刊：
影响因子：
--
通讯作者：
C. Syn;D. Lesuer;Jeff Wolfenstine;O. Sherby
中科院分区：
文献类型：
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作者：
C. Syn;D. Lesuer;Jeff Wolfenstine;O. Sherby
通过高温压接和滚压制备三种不同层厚度（750、200 和 50 μm）的含有等体积百分比超高碳钢（UHCS）和黄铜的层压金属复合材料，并在环境温度下进行拉伸测试。随着层厚度的减小，在 UHCS-黄铜界面处观察到拉伸延展性显着增加（从 13% 到 21% 再到 60%），分层趋势降低。层厚度对延展性的影响归因于残余应力，其对分层的影响随着层厚度的减小而减小。抑制分层可以抑制 UHCS 层中颈部的形成，从而实现更均匀的塑性。对于给定的层厚度，拉伸延展性随着组分层硬度比率的增加而降低。
Laminated metal composites containing equal volume percentage of ultrahigh carbon steel (UHCS) and brass were prepared in three different layer thicknesses (750, 200, and 50 μm) by press- bonding and rolling at elevated temperature and were tensile tested at ambient temperature. A dramatic increase in tensile ductility (from 13 to 21 to 60 pct) and a decrease in delamination tendency at the UHCS-brass interfaces were observed as the layer thickness was decreased. The layer thickness effect on ductility is attributed to residual stress whose influence on delamination is decreased as the layer thickness is decreased. Suppression of delamination inhibits neck for- mation in the UHCS layers, allowing for extended uniform plasticity. For a given layer thick- ness, the tensile ductility decreases as the ratio of hardness of component layers is increased.