锻压技术

金属材料点接触塑性强度的验证

英文标题：Verification of point contact plastic strength for metallic materials

作者：周流芳

关键词：金属塑性强度回归分析法点接触

分类号：TG113.25+3

出版年,卷(期):页码：2013,38(3):141-144

摘要：

用回归分析方法对几种金属材料点接触塑性变形试验结果进行分析，结果表明，压力P和压痕深度h的线性关系非常显著，线性相关系数大于0.99，接近1。证实了点接触塑性强度在点接触塑性变形过程中具有保持不变的特点，表明金属在点接触塑性变形过程中处于理想塑性状态。用二次试验法所得的点接触强度与理论值的平均偏差只有1.6%，证实了点接触塑性强度可以用二次试验法准确地测定，指出点接触塑性强度可以作为评价金属材料抵抗点塑性接触变形能力的一项新的力学性能指标。

Analysis of test results with regression analysis method in the point contact plastic deformation of metallic materials shows that the linear relationship between pressure P and the indentation depth h is significant and the linear correlation coefficient is greater than 0.99, closing to 1. It confirms that the plastic strength at the point contact remains unchanging during plastic deformation and indicates that the metal during plastic deformation is in the ideal plastic state. With secondary test method, the mean deviation between the point contact strength and the theoretical value is only 1.6%, which proves that the secondary test method can be used to measure the contact plastic strength accurately and points out that the point contact plastic strength can be applied as a new mechanics performance index to evaluate the capability of metal material resistance to point plastic contact deformation.

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