应用新型动光弹系统研究某设备受冲击载荷作用

Investigation on Stress Distribution in a Key Equipment Subjected to Impact Loading based on a New-type Dynamic Photoelastic System

结构受到冲击时,其应力分布与在静荷载作用下完全不同。本文应用新型动光弹实验系统研究了某设备在冲击载荷作用下其内部动态应力分布情况。该系统由部分传统的动光弹实验装置、高速摄影系统和数字光弹图像处理系统组成,并且采用激光光源、落锤冲击载荷加载装置。加工制作了该设备模型的光弹性模型,应用到冲击载荷作用下的实验研究中,得到了该关键设备在冲击载荷作用下的内部动态应力传播及分布规律、最大剪应力分布等结果。同时,应用ANSYS LS-DYNA软件模拟分析了该关键设备受冲击载荷的应力状态,并与实验结果对比分析,平均相对误差为5%左右。研究验证了该新型动光弹试验系统的可靠性,也根据应力分布情况为模型设计提供参考依据。

When a structure is subjected to an impact lbading, its stress distribution lS entirely different from that under static loading. In order to study the internal dynamic stress distribution of a key device subjected to an impact loading, a new-type dynamic photoelastic system was used. The new-type dynamic photoelastic system is composed of part of traditional dynamic photoelastic test device, high-speed photography system, digital image processing system, laser light source and drop hammer impact loading device. Photoelastic model of the equipment was manufactured and applied to impact loading experimental study. The internal dynamic stress propagation and distribution~ and the maximum shear stress distribution were obtained. In addition, numerical simulation of stress state in the key equipment subjected to impact loading was performed based on ANSYS LS-DYNA software. The comparison between numerical and experimental results indicates that the average relative error is 5%, which verifies the reliability of this system and provides reference for model designing.