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描述了在室温下用单向压缩实验测试大变形条件下冷拉铝棒的力学性能的方法和步骤,求出了大变形条件下的材料常数。实验结果表明:端面不同摩擦条件对试样压缩后的高度应变,开始时影响较大,随着变形程度的增加影响减小;冷拉铝棒在大变形条件下的实际应力-应变曲线,可以较为准确地用指数形式的硬化曲线表示;加载历史对指数硬化规律有较大的影响;端面不同摩擦条件对试件压缩后的鼓出程度影响很大,垫聚乙烯对降低摩擦影响有明显效果;随着变形程度的增加,鼓出程度明显增加,但当变形程度达到一定的值以后,鼓出程度减小。
The method and procedure for testing the mechanical properties of cold-drawn aluminum rods under large deformation at room temperature by one-way compression tests were described. The material constants under large deformation were obtained. The experimental results show that: the different friction conditions on the end face of the specimen after the compression of the high strain, the beginning of a greater impact, with the deformation degree increases the impact of reduced; cold drawn aluminum rod in the large deformation of the actual stress-strain curve, you can Which is more accurately expressed by the exponential hardening curve. The loading history has a greater influence on the exponential hardening law. Different friction conditions on the end face greatly influence the bulging of the specimen after compression, and the polyethylene cushion has a significant effect on reducing the friction ; With the increase of deformation, the degree of bulging increased obviously, but when the degree of deformation reached a certain value, the degree of bulging decreased.