有限宽板孔边弹塑性变形测试  

Testing of Elastic and Plastic Deformation on the Edge of Hole in Limited Width Board

作　　者：张天林[1] 薛炳[1] 朱金花[1] 何世平[1] 

机构地区：[1]中国科学技术大学力学和机械工程系,安徽合肥230027

出　　处：《实验力学》2005年第1期97-101,共5页Journal of Experimental Mechanics

基　　金：国家自然科学基金资助项目;批准号: 10232030

摘　　要：测量应变集中区域的弹塑性变形,对于研究材料损伤或微裂纹的产生,以预防宏观裂纹的产生及扩展具有重要的意义。为给航空发动机轮盘的损伤容限设计研究提供相关材料的力学实验参数,做了两个有限宽中心带孔试件的拉伸试验。试验中,采用单调逐级加、卸载的循环加载方式,并应用自动网格法和数字图像相关技术测量了孔周的全场位移分布。再应用最小二乘法将离散的位移分量拟合成二元多项式函数,求解出拉伸方向的应变分布,并给出孔边应力σ与孔边应变εy的关系曲线。It is very important to measure the elastic and plastic deformation in the strain concentration zone for studying damage or the micro-crack generating and avoiding macro-crack generating and growing in materials. In order to offer experimental mechanical parameters of correlative material for studying damage-limit-esign of the aircraft engine disk, the tensile tests of two limited width specimens with center-ole were performed. In the measuring processes, the periodic loading to the maximum and then unloading to zero with the same increment were carried out step by step and the whole displacement distribution around the hole was calculated by using automated grid method or digital image correlation. The discrete displacement components were fitted into a 2 dimensional polynomial function by using least square method, the strain distribution along the tensile direction was solved and the stress-train relation curve on the side of hole was given.

关 键 词：变形测试 有限 板孔 数字图像相关 弹塑性变形 航空发动机 自动网格法 多项式函数 最小二乘法 材料损伤 宏观裂纹 实验参数 相关材料 设计研究 损伤容限 拉伸试验 位移分布 技术测量 应变分布 拉伸方向 关系曲线 孔边应力 集中区 微裂纹 应用 力学 单调 求解 

分 类 号：O172[理学—数学] TM410.7[理学—基础数学]