储林华,王练,李恒羽,等.基于GA-BP改进算法的Zr-4合金高温本构关系模型建立[J].精密成形工程,2017,9(6):125-129.
CHU Lin-hua,WANG Lian,LI Heng-yu,et al.Establishment of High Temperature Constitutive Model of Zr-4 Alloy Based on GA-BP Improved Algorithm[J].Journal of Netshape Forming Engineering,2017,9(6):125-129. |
| 基于GA-BP改进算法的Zr-4合金高温本构关系模型建立 |
| Establishment of High Temperature Constitutive Model of Zr-4 Alloy Based on GA-BP Improved Algorithm |
| 投稿时间：2017-10-12 修订日期：2017-11-10 |
| DOI：10.3969/j.issn.1674-6457.2017.06.023 |
| 中文关键词: 遗传算法 BP神经网络 锆合金 本构关系 热模拟 |
| 英文关键词: genetic algorithm, BP neural network, zirconium alloy, constitutive relationship, thermal simulation |
| 基金项目: |
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| 中文摘要: |
| 目的 针对传统锻造工艺进行优化设计，提升产品质量和生产效率。方法 通过试验和模拟相结合的方法，建立能够真实反映锆合金高温变形特性的本构关系模型。利用Gleeble-3800热模拟机，对Zr-4合金的圆柱试样进行等温压缩变形试验，以不同变形条件（变形温度为700~1000 ℃，应变速率为0.001~0.1 s−1）下获得的应力-应变数据为基础，分别基于普通BP网络方法和遗传算法(GA)改进BP网络(GA-BP)方法建立了该合金的高温本构关系模型，对比两种模型的预测结果差异。结果 改进的GA-BP模型预测误差在±2%以内，而普通BP模型的误差范围为±6%。结论 改进模型具有更高的预测精度和稳定性，能够更加真实地描述Zr-4合金在高温变形时各热力学参数之间高度非线性的复杂关系，从而也为本构关系模型的建立提供一种十分准确有效的方法。 |
| 英文摘要: |
| The work aims to optimize traditional forging technology to improve product quality and production efficiency. The constitutive model which can truly reflect the high temperature deformation characteristics of zirconium alloy was established by combining experiment and simulation. The isothermal compression deformation test of Zr-4 alloy cylinder specimen was carried out with Gleeble-3800 thermal simulator. Based on the stress-strain data obtained under different deformation conditions (temperature 700~1000 ℃, strain rate 0.001~0.1 s−1), the high temperature constitutive relation model was established based on normal BP net-work method and improved GA-BP network method respectively. Finally, the difference of prediction results was compared be-tween the two models. The results show that the prediction error of improved GA-BP model was less than 2%. The error of or-dinary BP model was nearly 6%. It is obvious that the improved model has higher prediction accuracy and stability, and it can describe the complex relationship of different thermodynamic parameters in the high temperature deformation of Zr-4 alloy accurately. It also provides a very accurate and effective method for establishing the constitutive relation model. |
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