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研究冲击载荷下铜基摩擦材料的微观形变 ,试验是在分离式Hopkinson压杆上完成的 ,载荷工况分没围压和有围压两种 ,应变率范围为 (10 2 ～ 10 3 ) /s。冲击后的试件做SEM和X衍射分析。试验结果表明 :该材料在没有围压时塑性变形以滑移为主 ,宏观形貌为冲击脆性破坏 ,断裂模式为沿晶断裂 ;在有围压时 ,基体上出现了孪晶现象和塑性流动的湍流花纹 ,塑性变形的形式为滑移和孪晶的组合
The micro-deformation of copper-based friction material under impact load was studied. The test was carried out on a split Hopkinson pressure bar. There were no confining pressure and confining pressure in the load case, and the strain rate range was (10 2 ~ 10 3) / s. The impacted specimens were subjected to SEM and X-ray diffraction analysis. The experimental results show that the material is mainly in the form of slip when plastic deformation occurs in the absence of confining pressure, the brittle fracture is caused by the macroscopic morphology, and the rupture mode is the intergranular fracture. When there is confining pressure, twins and plastic flow appear on the substrate Turbulence pattern, the form of plastic deformation slip and twins combination