Influence of Hardening Model on the Simulation Calculation of Thermal-Mechanical Coupling in Ti80 Thick Plate Welding

LI Yu; HOU Jiayi; GU Lijun; LI Liangbi; WAN Zhengquan

doi:10.7512/j.issn.1001-2303.2024.08.07

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Influence of Hardening Model on the Simulation Calculation of Thermal-Mechanical Coupling in Ti80 Thick Plate Welding
Vol. 54, Issue 8, Pages: 51-64(2024)
Received：18 June 2024，

Published：25 August 2024
DOI： 10.7512/j.issn.1001-2303.2024.08.07
稿件说明：

移动端阅览

郦羽，侯家怡，顾立君，等.硬化模型对Ti80厚板焊接热-力耦合仿真计算的影响［J］.电焊机，2024，54（8）：51-64. DOI： 10.7512/j.issn.1001-2303.2024.08.07.

LI Yu, HOU Jiayi, GU Lijun, et al.Influence of Hardening Model on the Simulation Calculation of Thermal-Mechanical Coupling in Ti80 Thick Plate Welding[J].Electric Welding Machine, 2024, 54(8): 51-64. DOI： 10.7512/j.issn.1001-2303.2024.08.07.

摘要

在船用Ti80钛合金厚板的多层多道焊接中，材料经历了多次热-力循环的作用，焊接接头需要考虑材料在循环载荷作用下的热塑性变形行为，而不同的塑性本构模型所表达的材料力学特性存在明显差别，因此材料塑性模型对焊接残余应力的模拟计算有着直接影响。文中通过对Ti80钛合金材料在不同温度（20~900 ℃）的拉伸试验以及不同温度（20~800 ℃）的低周疲劳试验，获得了Ti80钛合金材料的理想弹塑性模型、各向同性硬化模型、随动硬化模型和混合硬化模型的材料参数。采用不同硬化模型对Ti80焊接接头焊接残余应力进行模拟计算，并采用X射线测量残余应力，将获得的残余应力结果进行对比，分析不同硬化模型对焊接残余应力的影响。结果表明，理想塑性模型低估了残余应力的大小，各向同性硬化模型略微高估了熔池及其附近的残余应力大小，随动硬化模型与混合硬化模型残余应力计算值较为接近，前者略小，后者可较精确预测残余应力。从工程应用的角度来看，推荐各向同性应变硬化模型，该模型在残余应力预报的数值最大，使用该模型可以获得相对保守的预测值。

Abstract

In the multi-layer and multi pass welding of marine Ti80 titanium alloy thick plates

the material has undergone multiple thermal-stress cycles. The welding joint needs to consider the thermoplastic deformation behavior of the material under cyclic loading

and different plastic constitutive models express quite differences in material mechanical properties. Therefore

the material plastic model has a direct impact on the simulation calculation of welding residual stress. This article obtains the material parameters of the ideal elastic-plastic model

isotropic hardening model

dynamic hardening model

and mixed hardening model of Ti80 titanium alloy material through tensile tests at different temperatures (20 ℃~900 ℃) and low cycle fatigue tests at different temperatures (20 ℃~800 ℃). Simulate and calculate the welding residual stress of Ti80 welded joints using different hardening models

and measure the residual stress using X-ray. Compare the obtained residual stress results and analyze the influence of different hardening models on welding residual stress. It can be concluded that the ideal plasticity model underestimates the magnitude of residual stress

while the isotropic hardening model slightly overestimates the magnitude of residual stress in the molten pool and its vicinity. The residual stress calculation values of the dynamic hardening model and the mixed hardening model are relatively close

with the former slightly smaller and the latter more accurately predicting residual stress. From the perspective of engineering applications

it is recommended to use an isotropic strain hardening model

which has the highest value in residual stress prediction. Using this model can obtain relatively conservative prediction values.

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Keywords

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