采用分子动力学方法模拟金属铜纳米杆的弯曲力学性能,研究了从准静态加载到快速加载范围内不同加载速率的行为.结果表明,金属纳米杆的弯曲力学行为表现出显著的加载速率相关性和非线性变形行为.在弹性弯曲过程中,一种变形机制是发生从面心立方到密排六方的晶格结构转变转变发生后横截面增大和长度减小导致抗弯能力显著增强.另一种变形机制是纳米杆不发生晶格结构转变,位错的产生和运动导致塑性行为.
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