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Uniaxial stress-strain properties of metallic materials at high strain rates and at higher temperatures

机译：高应变率和高温下金属材料的单轴应力 - 应变特性

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摘要

A combined experimental and numerical technique for the determination of uniaxial stress-strain properties of metallic materials at high strain rates and temperatures of up to 440°C is presented.ududExperiments were carried out using an existing ballistic test machine. Small cylindrical specimens of commercially pure copper and mild steel were placed upon a rigid anvil and were impacted by a hardened tool steel projectile at temperatures of up to 440 °C. The initial velocity of the projectile up to 120 m/s was recorded by a laser velocity-measuring device, and the deformation of the impacted specimen was measured after each test. For the purpose of high temperature tests, a modification for the machine have been made and a movable anvil unit to reduce the loss of heat has been designed and used.ududA mathematical model with a mixed boundary condition, to which the theory of propagation of longitudinal waves of plastic deformation is applied, has been established. Based on the model, a numerical method of the iterative procedure to determine dynamic properties of materials considering adiabatic shear effects at various temperatures has been utilized. The corresponding computer programs have also been written. The properties of wavepropagation in the impact process of the specimen have been analyzed. The factors affecting the deformation of the impacted specimen such as adiabatic shear phenomena, the effects of shock loading and the boundary conditions at the anvil end have been discussed, and the optimum parameters to determine the corresponding constitutive equations have been selected. Further, a method to examine and determine the validity of the constitutive equations of materials is recommended. The forms of constitutive equations at high strain rates up to 10s s'1 for metals (commercially pure copper and mild steel) at various temperatures up to 440 °C have been proposed and the parameters in these suggested equations have been determined by means of agreement of the experimental results and numerical calculations.
机译：提出了一种组合的实验和数值技术，用于在高应变率和高达440°C的温度下确定金属材料的单轴应力-应变特性。 ud ud使用现有的弹道试验机进行了实验。将市售纯铜和低碳钢制成的小的圆柱形试样放在刚性砧板上，并在高达440°C的温度下受到硬化的工具钢弹丸的撞击。用激光测速仪记录最高120 m / s的弹丸初始速度，并在每次测试后测量冲击试样的变形。为了进行高温测试，对机器进行了修改，并设计并使用了可移动的砧座单元以减少热量损失。 ud ud具有混合边界条件的数学模型，其理论如下已经应用了塑性变形的纵波传播。基于该模型，利用了一种迭代过程的数值方法，该方法可以考虑各种温度下的绝热剪切效应来确定材料的动态特性。相应的计算机程序也已编写。分析了样品在撞击过程中的传播特性。讨论了影响试样变形的因素，例如绝热剪切现象，冲击载荷的影响和砧座端部的边界条件，并选择了确定相应本构方程的最佳参数。此外，建议一种检查和确定材料本构方程有效性的方法。提出了在高达440°C的各种温度下，金属（商业纯铜和低碳钢）在高达10s s'1的高应变率下的本构方程的形式，并且通过协议确定了这些建议方程中的参数实验结果和数值计算。

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    Sun Jian;

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  • 年度 1993
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  • 正文语种 en
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