论文部分内容阅读
设计了径向基函数型人工神经网络模型,研究TA15钛合金的抗拉强度与热加工工艺参数的关系。用“留一法”训练了神经网络模型并对它的预测性能进行了测试,散点图和统计学指标均表明,人工神经网络模型经过训练后,具有较高的预测精度和可靠性。用训练好的神经网络模型预测了6个样本的抗拉强度,预测值与相应的实验测试值很接近,3个误差统计学指标的值分别为MSE=20.9,MRSE=2.11%,VOF=1.9895,这表明实验结果很好地验证了神经网络模型的计算结果,说明人工神经网络的预测结果是准确、可靠的。最后用神经网络模型分析了热加工工艺参数与抗拉强度间的定量关系,结果表明:加热温度在780~940℃之间时,随着加热温度T的升高,TA15钛合金的抗拉强度随之提高:加热温度为780℃时,抗拉强度为961.7 MPa,当加热温度升到940℃时,抗拉强度提高到了978.3 MPa;应变量在0.5~0.9范围时,随着应变量的增加,钛合金的抗拉强度也提高:应变量为0.5时,抗拉强度为973 MPa,当应变量达到0.9时,抗拉强度增加到了1020 MPa;应变速率在0.003~0.007 s-1范围内时,随着应变速率的增加,钛合金的抗拉强度也提高:应变速率为0.003 s-1时,抗拉强度为974 MPa,当应变速率达到0.007 s-1时,抗拉强度增加到了986.5 MPa。
A radial basis function artificial neural network model was designed to study the relationship between the tensile strength of TA15 titanium alloy and the thermal processing parameters. The neural network model was trained with “leaving a law” and its predictive performance was tested. The scatter plot and the statistical indicators show that the artificial neural network model has high prediction accuracy and reliability after being trained . The trained neural network model was used to predict the tensile strength of six samples. The predicted values were close to the corresponding experimental values. The values of the three error statistics were MSE = 20.9, MRSE = 2.11% and VOF = 1.9895 , Which indicates that the experimental results well verify the results of the neural network model, indicating that the artificial neural network prediction results are accurate and reliable. Finally, the neural network model was used to analyze the quantitative relationship between the thermal processing parameters and the tensile strength. The results show that with the increase of the heating temperature T, the tensile strength of TA15 titanium alloy increases with the increase of heating temperature from 780 ℃ to 940 ℃. With the increase of temperature, the tensile strength is 961.7 MPa when the heating temperature is 780 ℃. When the heating temperature rises to 940 ℃, the tensile strength increases to 978.3 MPa. With the strain in the range of 0.5 ~ 0.9, with the increase of strain , The tensile strength of titanium alloy is also improved: the tensile strength is 973 MPa when the strain is 0.5, and the tensile strength is increased to 1020 MPa when the strain is 0.9. When the strain rate is in the range of 0.003-0.007 s-1 , The tensile strength of titanium alloy also increases with the strain rate increasing: the tensile strength is 974 MPa when the strain rate is 0.003 s-1, and increases to 986.5 MPa when the strain rate reaches 0.007 s-1 .