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Thermo-Mechanical Aspects of Adiabatic Shear Failure of AM50 and Ti6A14V Alloys

机译:AM50和Ti6a14V合金的绝热剪切失效热机械方面

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The thermo-mechanical aspects of adiabatic shear band (ASB) formation are studied for two commercial alloys: Mg AM50 and Ti6A14V. Tests are carried out on shear compression specimens (SCS). The evolution of the temperature in the deforming gauge section is monitored in real time, using an array of high speed infrared detectors synchronized with a Kolsky apparatus (split Hopkinson pressure bar). The evolution of the gage temperature is found to comprise 3 basic stages, in agreement with Marchand and Duffy's simultaneous observations of mechanical data and gauge deformation patterns (1988). The onset and full formation stages of ASB are identified by combining the collected thermal and mechanical data. Full development of the ASB is identified as the point at which the measured and calculated temperature curves intersect and diverge thereon. At that stage, the homogeneous strain assumption used in calculating the maximum temperature rise is no longer valid.
机译:研究了两种商用合金的绝热剪切带(ASB)形成的热机械方面:Mg AM50和Ti6a14V。测试在剪切压缩样本(SCS)上进行。使用与KOLSKY设备(分割HOPKINSON压力棒)同步的高速红外探测器阵列实时监测变形规计段中温度的进化。发现量温度的演变包括3个基本阶段,与Marchand和Duffy同时观察机械数据和仪表变形图案(1988)。通过组合收集的热和机械数据来识别ASB的开始和全部形成阶段。 ASB的全面开发被识别为测量和计算的温度曲线相交和发散在其上的点。在该阶段,在计算最大温升时使用的均匀应变假设不再有效。

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