Abstract:Here, based on the digital image correlation method, a 3-D high-speed videography system was constructed for flexible body lowspeed impact tests. A spherical cylindrical rod-square plate system was taken as the test object and out-of-plane contact impact tests were conducted. By settingthe system’s key parameters, the flexible body’s wholefield strain responses were measured and compared withthe results of strain gauge measurement and numerical simulation. Results showedthata 3-D system avoids drawbacks of a 2-D system being easy to be affected byout-of-plane displacements, and it can be used to accurately measure a flexible body’s wholefield displacement, velocity and strain response.2 bodies’ central normal impact tests were conducted to obtain flexible bodies’impact process and whole field strain distribution features. It was shown that their strains in X and Y directions reveal the shape of "peanut",their principal strain fieldsreveal the shape of "concentric circle"; their shear strain fieldsreveal the shape of "four-spindle"; in the case of low-speed collision,the maximum principal strain at the collision point and impact velocity reveals a secondary power relation.
瞿力铮,邓小伟,余征跃,洪嘉振. 基于三维数字图像相关技术的柔性体低速碰撞实验研究[J]. 振动与冲击, 2019, 38(19): 139-143.
QU Lizheng,DENG Xiaowei,YU Zhengyue,HONG Jiazhen. Tests for low speed impact of flexible bodies based on 3D digital image correlation technique. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(19): 139-143.
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