Modeling of the material behavior during hot hydroforming

Modeling of the material behavior during hot hydroforming
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热液压成形过程中材料行为的建模

DOI:
10.1002/mawe.201100720
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发表时间:
2011
影响因子:
1.1
通讯作者:
Groche P.
Groche P.
中科院分区:
材料科学4区
文献类型:
--
作者:
Elsenheimer;Taplick;Groche P.

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为了对金属成形过程进行数值模拟,需要通过与特定过程类似的测试程序确定材料数据。热管胀形试验技术是近年来发展起来的一项新技术,可以满足热液压成形对材料参数确定的要求。基于该技术获得的测量数据,选定的本构关系近似的流变应力取决于温度,应变速率和对数应变的参数化应用线性回归分析。采用近似质量最好的材料定律,对典型成形过程进行了数值模拟。热液压成形过程后的实验获得的几何形状和通过数值分析的预测之间的比较用于评估这种过程的确定的材料数据的质量和适用性。此外,过程模拟,使用外推材料数据压缩测试可视化的影响,测试过程中产生的零件几何形状预测。
For the purpose of numerically simulating metal forming processes, material data are necessary, determined by testing procedures similar to the particular process. The new technology of hot tube bulge tests has been introduced recently, fulfilling the requirements of material data determination for hot hydroforming. Based on measurement data gained by this technology, selected constitutive relations for approximating the flow stress depending on temperature, strain rate and logarithmic strain were parameterized applying linear regression analysis. Using the material law with the best approximation quality among the regarded equations, a numerical simulation of an exemplary forming process was accomplished. A comparison between the experimentally obtained geometry after a hot hydroforming process and the prediction by numerical analysis is used for evaluating the quality and applicability of the determined material data for this kind of process. Additionally, a process simulation, using extrapolated material data from compression tests is presented to visualize the influence of the testing procedure on the resulting part geometry prediction.
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