高级检索

    材料残余应力测定方法的发展趋势

    Development Tendency of Measurement Methods for Residual Stresses

    • 摘要: 残余应力的存在对材料的疲劳强度、应力腐蚀和形状精度等性能均会产生很大的影响,所以残余应力的准确测定至关重要。针对目前应用的残余应力测定方法现状进行了分析,重点介绍了针对微小体积材料表面的残余应力测定的纳米压痕法,当其结合有限元分析法时,不仅可以计算给定条件下的残余应力场,也可研究残余应力的形成与演化规律,特别是为压痕过程进入塑性阶段的力学分析和模型建立提供了可能。对比了几种残余应力测定方法的特点和适用范围,对残余应力测定方法的发展趋势进行了分析,指出测定技术应向着无损、快捷、无污染等方向发展。

       

      Abstract: The existence of residual stresses has a significant impact onthe material performance, such as fatigue strength, stress corrosion and shape accuracy, so it is very important to accurately measure the residual stresses. The current measurement methods of residual stress were summarized, and the instrumented nanoindentation measurement for surface residual stresses of small volume material was emphasized. By combining nanoindentation with the finite element analysis method, not only residual stress field can be calculated under a given condition, but also the formation and evolution of residual stress can be determined, and especially it is possible to analyze the mechanics when the indentation process enters into plastic phase and to establish mechanics models. The characteristics and application scope of several residual stress measurement method were compared, and the development trend was analyzed. This paper also pointed out that the measurement technology should be developed towards the nondestructive, quick and unpolluted direction.

       

    /

    返回文章
    返回