锻压技术

不同试样对TA2/T2复合管绕弯成形回弹模拟的适用性研究

英文标题：Research on applicability of different specimens to springback simulation of rotary-draw bending for TA2/T2 bimetal composite tube

作者：朱英霞施伟涂文斌郭渊王匀

单位：江苏大学

关键词：TA2/T2双金属复合管绕弯成形力学性能回弹单向拉伸本构模型

分类号：TG386

出版年,卷(期):页码：2020,45(12):102-109

摘要：

为了准确地模拟TA2/T2双金属复合管的绕弯成形过程，分别采用4组试样进行了单向拉伸实验，即：管弧形试样、单层圆管试样、板料试样和双金属复合圆管试样，并建立了基于4组试样的TA2/T2双金属复合管的材料本构模型。为对比4组试样的材料本构模型的精确性，建立了TA2/T2双金属复合管绕弯-回弹全过程的反向验证有限元模型。研究结果表明，4组试样的塑性应力-塑性应变曲线均可采用σ=B(ε0+ε)n幂指数函数来描述。采用单层圆管试样的材料本构模型预测的回弹角最接近实验结果，且结果可靠，平均误差为530%，最大误差为963%；采用管弧形试样和板料试样的材料本构模型预测回弹角，平均误差分别为1432%和1542%，最大误差分别为1946%和2251%；采用双金属复合圆管试样获得的材料本构模型预测的回弹角的精度最低。因此，单层圆管试样的本构模型能更准确地描述复合管绕弯成形过程的材料状态。另外，回弹角随覆管和基管弹性模量的增大而减小，随覆管和基管应变硬化指数的增大而减小，随覆管和基管强度系数的增大而增大。

In order to accurately simulate the rotary-draw bending process of TA2/T2 bimetal composite tube, the uniaxial tensile experiments with four sets of specimens were conducted respectively, namely, tube arc specimen, single layer round tube specimen, sheet metal specimen and bimetal composite round tube specimen, and the material constitutive models of TA2/T2 bimetal composite tube based on the above four sets of specimens were established. Then, a reverse verification finite element model of the whole rotary-draw bending-springback process for TA2/T2 bimetal composite tube was established to compare the accuracy of the material constitutive models obtained from the four sets of specimens. The research results shows that all the plastic stress-plastic strain curves obtained by the four sets of specimens are described by power exponential function σ=B(ε0+ε)n, the springback angles predicted by the constitutive model of the single layer round tube specimen are the closest to the experimental results, and the results are reliable with the average error of 530% and the maximum error of 963%. Furthermore, the average errors of springback prediction are 1432% and 1542% respectively and the maximum errors are 1946% and 2251% respectively by the material constitutive models of tube arc specimen and sheet metal specimen, and the prediction accuracy of the springback angle is the lowest when the material constitutive model of the bimetal composite round tube specimen is used. Therefore, the constitutive model of the single layer round tube specimen more accurately describes the material state of the composite tube during the rotary-draw bending process. In addition, the springback decreases with the increasing of elastic modulus and hardening index and increases with the increasing of strength coefficient of covered tube and based tube.

基金项目：

国家自然科学基金资助项目(51601070)；江苏省博士后科学基金(1501099B)；江苏大学高级人才科研启动基金(14JDG135)

朱英霞(1986-)，女，博士，讲师 E-mail：xia166109@163com

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