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A constitutive relation and failure criterion for Ti6A14V alloy at impact rates of strain

机译:Ti6A14V合金在应变冲击速率下的本构关系和破坏准则

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Shear stress-strain curves have been obtained for thin-walled tubular specimens of Ti6A14V alloy at strain rates from ~ 7×10~-4/s to ~ 1000/s. A specially developed infrared radiometer has been used to measure the rise in specimen surface temperature during the high strain rate tests where the deformation process is essentially adiabatic. The data obtained were used to obtain material constants for a Serially-Armstrong type constitutive relation giving the `best fit 'with the observed mechanical response. This relation was incorporated in the ABAQUS/explicit FE code and shown to predict the experimentally measured flow stress in the impact tests with reasonable accuracy. A failure criterion, based on a critical value of effective plastic strain, is also incorporated, the critical condition being chosen to give agreement between the predicted and the measured overall failure strains. The validity of the constitutive relation and associated failure criterion is then assessed in terms of their ability to predict the observed mechanical response in tensile impact tests on specimens of both cylindrical and rectangular cross-section where the early onset of localized plastic flow and significant temperature rises in this region provide a more rigorous test of the proposed model. High-speed photography was used to monitor the changing specimen cross-section and the infrared radiometer was used to determine the specimen surface temperature in the region of localized deformation. Reasonable agreement was obtained between the experimental results and the numerical predictions using the ABAQUS/explicit FE code.
机译:Ti6A14V合金薄壁管状试样的剪切应力-应变曲线在〜7×10〜-4 / s至〜1000 / s的范围内获得。在变形过程基本上是绝热的高应变率测试期间,已使用专门开发的红外辐射计来测量样品表面温度的升高。获得的数据用于获得连续-阿姆斯特朗型本构关系的材料常数,从而给出“最佳拟合”和观察到的机械响应。该关系已并入ABAQUS / explicit FE代码中,并显示出以合理的精度预测在冲击测试中实验测量的流应力。还包括基于有效塑性应变的临界值的破坏准则,选择临界条件以使预测的和测量的整体破坏应变达到一致。然后根据本构关系和相关破坏准则的有效性来预测圆柱和矩形横截面试样的拉伸冲击试验中观察到的机械响应的能力,以此评估本构关系和相关破坏准则的有效性,在该试样上局部塑性流动的初期发作和明显的温度升高在该区域中,对所提出的模型进行了更严格的测试。高速摄影用于监测变化的样品横截面,红外辐射计用于确定局部变形区域的样品表面温度。使用ABAQUS / explicit FE代码在实验结果和数值预测之间获得了合理的一致性。

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