碳化硼屏蔽组件模拟件悬臂弯曲性能研究

Study of the Cantilever Bending Performance of the Boron Carbide Shielding Assembly Simulator

获得碳化硼屏蔽组件在横向载荷作用下的力学响应及力学性能参数是进行组件结构完整性评价的重要基础。本文首先建立了一套适用于全尺寸组件的力学性能测量装置,结合利用激光开关测量残余塑性挠度的方法,实现了全尺寸碳化硼屏蔽组件模拟件悬臂弯曲和残余塑性挠度的测量。试验得到碳化硼组件模拟件弯曲刚度均值为33.23 N/mm,六角管前凸台产生1mm残余塑性挠度所需要的横向载荷约为2561.9 N。通过试验发现在悬臂弯曲加卸载过程中组件模拟件根部被水平拔出,并通过有限元计算证明了加卸载过程中模拟件尾端与夹具的接触状态发生改变,造成模拟件刚体转动并带来挠度的变化。通过转角补偿修正之后,试验结果与有限元计算结果吻合得很好。

Obtaining the mechanical response and mechanical properties of the boron carbide shielding assembly under lateral load is important to assess the structural integrity.In this paper,a mechanical performance measurement system suitable for full-scale assembly is established,and a laser switch method for measuring residual plastic deflection is proposed.Based on these,the cantilever bending and residual plastic deflection measurement of a full-scale boron carbide shielding assembly simulator was conducted.The experimental results show that the average bending stiffness of the shielding assembly simulator is 33.23 N/mm,and the lateral load required for the free end of the hexagonal tube of the assembly producing residual plastic deflection with 1 mm is about 2561.9 N.Moreover,the root of the shielding assembly simulator was pulled out horizontally during the loading and unloading process.In addition,the finite element result proves that the contact state between the root of the shielding assembly simulator and the fixture changed during the loading and unloading process,which led to the rigid rotation of the shielding assembly simulator,thereby changing the deflection.After angle compensation and correction,the experimental results are in good agreement with the finite element results.