基于三维数字图像相关的双轴振动疲劳试验研究  

Experimental study on biaxial vibration fatigue based on 3D digital image correlation

作　　者：魏良宝 蒋明[1] 

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《苏州科技大学学报（工程技术版）》2017年第4期32-39,共8页Journal of Suzhou University of Science and Technology（Engineering and Technology Edition）

基　　金：国家自然科学基金项目(11172193)

摘　　要：为研究双轴振动疲劳下,构件裂纹区域位移与应变场的变化规律,本试验采用双轴振动疲劳装置与数字采集系统实时监测裂纹区域。由高速数字图像相关系统采集一系列正弦交变载荷作用下预制裂纹梁试件裂纹周边区域的序列数字散斑图像,应用三维数字图像相关技术获取试件固有频率的变化、预制裂纹尖端区域的位移场及应变场。通过对预制裂纹尖端区域在不同循环周期下离面位移、主应变、离面应变变化的分析,获得位移、应变与循环周期之间的变化规律。In order to study the variation of the displacement and strain field of the crack region under the biaxial vibration fatigue, the experiment adopted the biaxial vibration fatigue device and the digital acquisition system to monitor the change of the crack area in real time. A series of digital speckle images of the prefabricated cracked beam specimen under the series of sinusoidal alternating loads were collected by the high-speed digital image correlation system, and the 3D digital image correlation technique was used to calculate the natural frequency of the specimen, the displacement field and strain field in the crack tip region. The change of the displacement direction, the main strain and the strain in the direction of the surface of the prefabricated crack were analyzed under different cycle periods, and the change rule between displacement, strain and cycle was obtained.

关 键 词：振动疲劳 三维数字图像相关 双轴振动 位移场 应变场 

分 类 号：TH113.1[机械工程—机械设计及理论]