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用薄试样push-out和push-back试验测试了SCS-6/Timetal834复合材料从室温到530℃温度范围内的峰值载荷和滑动摩擦切应力。用轴对称圆柱有限元模型模拟计算了SiC纤维增强钛基复合材料不同温度下的界面应力沿轴向分布规律和界面脱粘过程。计算表明,push-out试验的界面脱粘过程可以用剪切强度准则描述,对于SCS-6/Timetal834复合材料,当界面单元尺寸L=6.25μm时,其室温下界面剪切强度τm=500MPa,300℃时τm=300MPa,530℃时τm=140MPa。由于应力奇异性的影响,界面剪切强度的值与单元尺寸大小有关。
The thin-walled samples push-out and push-back tests were conducted to investigate the peak load and sliding friction shear stress of SCS-6 / Timetal 834 composites from room temperature to 530 ℃. The axial stress distribution and interfacial debonding process of SiC fiber reinforced titanium matrix composites at different temperatures were simulated with the axisymmetric cylindrical finite element model. The calculation results show that the interfacial debonding process of push-out test can be described by the shear strength criterion. For the SCS-6 / Timetal 834 composite, the interfacial shear strength τm = 500MPa at room temperature when the interface unit size L = 6.25μm, 300 ℃ τm = 300MPa, 530 ℃ when τm = 140MPa. Due to the influence of stress singularity, the value of interfacial shear strength is related to the cell size.