陶瓷材料在高速拉伸撞击下的力学行为

Mechanical Behavior of Ceramics under High-Velocity Tensile Impact

本文研究了Sialon和Sialon/TiC两种陶瓷合金在高速拉伸撞击下的力学行为,分析了这两种陶瓷合金的显微组织特征,比较了不同应力状态下的断口形貌.结果表明:Sialon和Sialon/TiC两种陶瓷合金的力学性能强烈地依赖于其受力状态和微结构引起的裂纹尖端应力扰动.对Sialon/TiC合金而言,由于组织中硬质TiC粒子的存在对裂纹有阻碍作用,使得韧性升高,强度下降.高速拉伸撞击下应力速度大,组织中缺陷的作用减弱,强度明显高于单向拉伸状态.

In this paper, the mechanical behavior of sialon and sialon /TiC ceramic alloys under high-velocity tensile impact was studied. XEM and SRD were used to characterize the microstructure. Fracture surface was investigated under different kinds of loading. The results show that the mechanical behavior of sialon and sialon/TiC ceramic alloys is mainly dependent on the stress state and crack-tip stress disturbance. For sialon/TiC ceramics, TiC particles inhibit crack propagation, make K_(IC) increased and strength decreased. Under high-velocity tensile impact, high strength was measured because of high strain-rate.