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利用Gleeble1500D试验机对真空浸渗法制备的Csf/Mg复合材料进行热压缩试验,研究了在596~696 K,应变速率5×10-3~5×10-1s-1,最大真应变0.6变形条件下的塑性变形力学行为。根据Csf/Mg复合材料热压缩试验数据及其力学行为特征,采用多元非线性回归方法建立了其高温粘塑性力学本构关系模型,克服了以往Arrhenius模型只能计算峰值应力或稳态应力的不足。结果表明,流变应力的预测值与试验值绝对误差平均值为8.95%,相关系数0.9549。
The thermal compression tests of Csf / Mg composites prepared by vacuum infiltration method were carried out on a Gleeble1500D testing machine. The effects of strain rate of 5 × 10-3 ~ 5 × 10-1s-1 and strain of 0.6 on the true strain at 596 ~ 696 K were studied. Plastic deformation mechanics behavior under the condition of. According to the thermocompression test data of Csf / Mg composites and their mechanical behaviors, the constitutive model of high temperature viscoplasticity was established by using multivariate nonlinear regression method, which overcomes the shortcomings that the Arrhenius model can only calculate the peak stress or the steady state stress . The results show that the average error between the predicted value and the experimental value of flow stress is 8.95% and the correlation coefficient is 0.9549.