用无单元伽辽金法分析焊接残余应力的温度分布,并进行了实验验证

IF 2.5 3区 工程技术 Q2 MECHANICS
Ali Moarrefzadeh, Behzad Jabbaripour
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引用次数: 0

摘要

焊接过程会在结构中产生残余应力。有限元法被广泛应用于残余应力的确定,但由于焊接喷嘴的运动,这种方法存在一些问题。本文将基于无单元伽辽金(EFG)法的数值解扩展到预测焊接温度分布和残余应力。基于热弹塑性方法的热力学分析分两个阶段进行。为了得到最终的节点分布,研究了支持域的形状和大小、影响域的大小、不同的权函数和节点之间的距离。为了验证结果,分别采用激光测温法和钻孔应变法对温度场和残余应力进行了测量。数值解的结果与实验方法吻合较好,表明了所提公式的准确性和参数研究方法的有效性。据此,提出了基于EFG方法的热弹塑性方程在预测温度分布和确定残余应力方面的新应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Temperature distribution analysis and determination of residual stress due to welding using the element-free Galerkin method with experimental validation

Temperature distribution analysis and determination of residual stress due to welding using the element-free Galerkin method with experimental validation

The welding processes generate residual stress in structures. Finite element methods are widely used to determine residual stresses, but this method has some problems due to the movement of the welding nozzle. In this research, numerical solution based on element-free Galerkin (EFG) method is extended to predict the temperature distribution and residual stresses due to welding. Thermal and mechanical analysis based on thermal-elastoplastic method is done in two stages. To reach the final nodal distribution, the shape and size of the support domain, influence domain size, different weight function and distance between nodes were studied. To validate the results, laser thermometer and the hole-drilling strain-gauge method have been used for the results of temperature field and residual stress, respectively. A good agreement has been obtained between the results of numerical solution and experimental methods, which indicates the accuracy of the presented formulation and the effectiveness of the parameters investigation method. Accordingly, a new application for the thermo-elastoplastic equation based on the EFG method to prediction of the temperature distribution and determination of residual stresses has been presented.

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来源期刊
CiteScore
4.40
自引率
10.70%
发文量
234
审稿时长
4-8 weeks
期刊介绍: Archive of Applied Mechanics serves as a platform to communicate original research of scholarly value in all branches of theoretical and applied mechanics, i.e., in solid and fluid mechanics, dynamics and vibrations. It focuses on continuum mechanics in general, structural mechanics, biomechanics, micro- and nano-mechanics as well as hydrodynamics. In particular, the following topics are emphasised: thermodynamics of materials, material modeling, multi-physics, mechanical properties of materials, homogenisation, phase transitions, fracture and damage mechanics, vibration, wave propagation experimental mechanics as well as machine learning techniques in the context of applied mechanics.
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