锻压技术

冲压成形工艺对材料疲劳性能影响的实验研究

英文标题：Experimental study of the influence of forming process on material fatigue performance

作者：陈伟那景新扈越萌

单位：南京工程学院吉林大学

关键词：疲劳性能冲压成形预变形 S-N曲线

分类号：TG386

出版年,卷(期):页码：2015,40(12):126-130

摘要：

采用实验测试与理论分析相结合的方法，研究冲压成形工艺引起的预变形对材料疲劳性能的影响。设计不同变形量的预拉伸试验来分析成形工艺所引起材料不同变形量，针对薄板试件无法进行对称循环加载疲劳实验的问题，提出了采用0.1拉-拉循环加载与Gerber反向修正相结合的试验-计算混合方法，得到了薄板试件对称循环的持久疲劳极限。对不同变形量的材料持久疲劳极限做拟合处理，得到变形量与材料持久疲劳极限之间的变化规律。对材料S-N曲线进行工程简化，得到几种典型变形量的S-N曲线，在可以满足工程要求的前提下，减少了疲劳性能测试的工作量。

The influence of the pre-deformation caused by forming process on material fatigue performance was studied by combining the experimental test with the theoretical analysis. The pre-tensile experiments of different deformation amounts were designed to consider the different deformations caused by forming process. For the problem that the fatigue limit with symmetric cyclic load of the sheet sample was not carried out, it was proposed that an experiment-computation method combining 0.1 stretch-stretch cyclic loading with Gerber reverse modifications, and then the endurance fatigue limit of the sheet sample under symmetric cyclic load was gained. Then the curve fitting was done for material fatigue limit under different deformation magnitude, and the rule between the deformation amount and material fatigue limit was obtained. Finally the materials S-N curve was simplified for engineering application, and S-N curves of several typical deformation amounts were achieved. The fatigue performance testing was greatly reduced on the premise of the engineering requirements.

基金项目：

国家自然科学基金资助项目（51075187）；南京工程学院校级科研基金资助项目（YKJ201433）

作者简介：陈伟(1985-)，男，博士，讲师

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