铝合金厚板淬火-预拉伸应力预测与测试

Prediction and measurement of quenching-prestretching stress in aluminum alloy thick plate

采用非线性有限元软件MSC.Marc,结合淬火和预拉伸实验,建立厚板淬火-预拉伸应力预测模型时,运X射线衍射技术的层削测试方法验证了此模型。结果表明:应力场预测模型计算结果与实验测算吻合较好,其中淬火应力平均偏差小于10%;有效的实验测试可以对有限元预测模型的建立进行改进和检验;理想假设的存在使得预测结果与实际有所偏离,但应力预测趋势仍可有效揭示厚板的应力演变规律。

The stress prediction model was set up using the software of MSC.Marc,and combining quenching and prestretching experiments.This model was confirmed by X-ray diffractometry and layer removal methods.The experimental results are compared with predicted results.The prediction results of stresses match with experimental results,and the average difference of quenching stress is less than 10%.The effective experimental methods can improve and validate the FEM of stress prediction.The hypotheses in FEM make the results to deviate with the experiment data,but the prediction trend can effectively reveal the evolvement law of stress in thick plate.