采用梯度塑性理论,考虑了峰值剪切应力之后的材料承载能力缓慢降低的过程及承载能力快速降低的过程,推导了剪切带内部的剪切变形、应变及温度分布的公式.计算了Ti-6Al-4V剪切带内部塑性剪切应变,温度的分布及演变.在剪切带内部,塑性剪切应变及温度分布是高度不均匀的,这种不均匀性随着施加的塑性剪切应变的增加而增加.随着流动剪切应力的降低,剪切带内部的最大塑性剪切应变线性增加,最高温度非线性增加.由于微结构效应,基于梯度塑性理论的剪切带内部的最大塑性剪切应变及最高温度的预测值高于经典理论的预测值.将Ti-6Al-4V剪切带内部的剪切变形及应变的理论结果与根据前人高速摄影实验图片的计算结果进行了对比,理论与实验结果的趋势非常吻合,在数值上,剪切带内部的最大剪切应变的理论值仍低于实测值.
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