典型隔热瓦元件剪切性能及重复加载行为试验研究  

Experimental Study on the Shear Performance and Cyclic Loading Behavior of Thermal Insulation Tile Components

作　　者：陆毛须 吴振强[2,3] 李金铭 郝自清 刘刘 LU Maoxu;WU Zhenqiang;LI JinMing;HAO ZIQing;LIU Liu(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Structure and Environment Engineering,Beijing 100076,China;Science and Technology on Reliability and Environmental Engineering Laboratory,Beijing Institute of Structure and Environment Engineering,Beijing 100076,China)

机构地区：[1]北京理工大学宇航学院力学系,北京100081 [2]北京强度环境研究所,北京100076 [3]北京强度环境研究所可靠性与环境工程技术重点实验室,北京100076

出　　处：《强度与环境》2024年第5期1-7,共7页Structure & Environment Engineering

基　　金：国家自然科学基金联合基金项目(U20B2002);北京强度环境研究所联合创新基金(BQJJ202303)。

摘　　要：为了评估典型隔热瓦元件受剪切载荷时的重复使用性能,明确典型元件剪切力学性能及重复加卸载变形特征,本文开展了应变隔离垫(SIP)和SIP-隔热瓦-SIP元件的剪切力学性能试验研究,得到了两类试验件的载荷-位移曲线、峰值载荷、失效模式及不同峰值载荷下试验件的剪切加卸载行为,对两类试验件在准静态单剪载荷下的失效模式及其形成机制进行了定性分析和比较。利用数字图像相关技术(DIC)分析了SIP-隔热瓦-SIP元件的变形特征和剪切失效过程。结果表明:试验中由于剪切载荷不共线,导致试验件自由边界处存在附加弯矩,试验件为界面拉-剪组合失效。随着试样厚度增加,附加弯矩不断增大,使得隔热瓦元件的峰值载荷水平低于SIP试验件。由于SIP具有变形协调能力,剪切载荷作用下隔热瓦主要发生刚体位移,应变和应力水平低。两类试验件的剪切加卸载曲线均存在显著的迟滞效应。迟滞回线的面积和割线刚度随加卸载循环次数的变化不明显,但迟滞回线的面积随着峰值载荷的增大而增大。上述试验结果可为后续克服附加弯矩,完善双剪试验方案和建立SIP及隔热瓦元件剪切力学性能测试规范提供指导,为刚性隔热瓦热防护系统失效行为分析和结构设计优化提供参考。Monotonic and loading-unloading shear tests were conducted on strain isolation pads(SIP),SIP-thermal insulation tile-SIP components to evaluate their reusability,as well as to determine the shear mechanical properties and loading-unloading deformation characteristics of typical components.The load-displacement curves,peak loads,failure modes,and shear loading-unloading behaviors of the two types of test specimens under different peak loads have been obtained.The failure modes and formation mechanisms under quasi-static shear loads were qualitatively analyzed and compared.The deformation characteristics and shear failure process of the thermal insulation tile component were analyzed by digital image correlation technology(DIC).The results show that,due to the non-collinearity of the shear load,there is an additional bending moment at the free boundary of the test specimen.The specimens all fail due to interface tension-shear coupling interactions.As the thickness of the specimen increases,the additional bending moment continues to increase,making the peak load level of the thermal insulation tile component lower than that of the SIP specimen.Due to the deformation coordination ability of SIP,the thermal insulation tile component mainly undergoes rigid body displacement under shear load with low strain and stress levels.There is a significant hysteresis effect in the shear loading and unloading curves of both types of test pieces.The area of the hysteresis loop and the secant stiffness do not change significantly with the number of loading-unloading cycles,but the area of the hysteresis loop increases with an increase in peak load.The above test results can provide guidance for overcoming the additional bending moment,improving the double shear test scheme,establishing the shear mechanical performance test specifications of SIP and thermal insulation tile componentswhile alsoproviding a reference for the failure behavior analysis and structural design optimization of the rigid thermal insulation tile thermal protec

关 键 词：隔热瓦元件 应变隔离垫 剪切失效 加卸载 

分 类 号：TG146.14[一般工业技术—材料科学与工程]