硼化物基超高温陶瓷材料在热力耦合作用下力学性能研究

Research on Mechanical Properties of Borohydride High Temperature Ceramic Materials under Thermodynamic Coupling

以新型天地往返飞行器、高超声速飞行器和火箭推进系统等最具前景的候选材料——硼化物基超高温陶瓷材料的应用为背景,采用有限元法ABAQUS软件对UHTC试件进行数值模拟,得到带有表面贯穿裂纹的UHTC试件在不同加载条件下的应力、应变及应力强度因子的变化规律,为研究材料在热冲击过程中考虑应变速率的影响奠定理论基础。

Under the background of the application of borohydride high temperature ceramic materials,often used as candidate materials in spacecraft,hypersonic aircraft and rocket propulsion systems,finite element method of ABAQUS software is used to numerically simulate UHTC specimen,obtaining the changing rule of the stress,strain and stress intensity factor of UHTC specimen with surface penetrating crack under different loading conditions.Thus a theoretical foundation is laid for the study on the effect on strain rate on thermal shock process of materials.