TiC颗粒增强钨基复合材料热冲击损伤数值模拟

NUMERICAL SIMULATION OF THERMAL SHOCK DAMAGE OF TiC PARTICLE-REINFORCED TUNGSTEN MATRIX COMPOSITES

对TiC颗粒增强钨基复合材料在氧乙炔焰热冲击下的损伤行为从宏观和微观两层次进行有限元数值模拟。试样加热表面和背壁的温度随时间变化的实验测试结果与数值模拟结果一致。复合材料宏观损伤行为的实验结果是裂纹在试样周边萌生 ,沿径向向中心扩展 ,与数值模拟预报结果吻合。复合材料微结构损伤行为的数值预测是裂纹在TiC颗粒 /基体界面附近产生 ,而后在基体中扩展 。

The unsteady temperature fields and the corresponding unstable thermal stress fields of tungsten composites reinforced by TiC (TiC/W) during the thermal shock caused by an oxyacetylene flame are simulated using a finite element method The calculated results of the temperature curves of the heated surface and back surface agree well with the experimental results The predicted damage mode of TiC/W samples is that crack initiates in the edge of the sample and then propagates to the center zone,which is consistent with the experimental result The microscopic stress field of TiC/W microstructure is analyzed using a finite element method based on the unsteady thermal stress field of the TiC/W sample The damage mode of the microstructure is that crack initiates near TiC/W interface and propagates in the W matrix,which agrees with the experimental result