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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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拉伸轴与孪晶界角度对纳米孪晶材料变形行为的影响
DOI: 10.3969/j.issn.1671-7627.2014.03.006, PP. 26-31
Keywords: 纳米孪晶材料,本构模型,应变梯度,位错
Abstract:
基于纳米孪晶材料独特的微结构及其内部变形机制,建立了相交于孪晶界剪切变形和平行于孪晶界剪切变形的几何模型,采用有限元模拟的方法分析拉伸轴与孪晶界角度对纳米孪晶材料变形行为的影响。等效塑性应变演化过程表明:即使是相邻的晶粒,它们的应变分布也有很大不同,这都是因为拉伸轴与孪晶界角度的影响。通过合理调整角度,可以有效地延迟剪切带的出现。但是随着孪晶片层厚度的减小,角度的影响越来越薄弱。
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