模拟复杂激光焊接过程中残余变形的中尺度方法

IF 1.3 4区 工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Piero Favaretti, L. Parussini
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引用次数: 2

摘要

激光焊接的特点是光束半径非常小,在十分之一毫米的数量级,并且非常短的高功率输入(在几毫秒内更多的kW),因此,它可以肯定地归类为具有高物理复杂性的微尺度过程。这显然是不相容的,由于计算成本高,与大几何形状和不均匀焊接模式相关的宏观过程的分析。为了克服这一问题,提出了一种基于简化有限元法(FEM)的热弹塑性模型来模拟热膨胀和材料塑性引起的传热和残余变形。其思想是用中尺度方法代替微观分析,放弃详细描述加热区发生的所有物理现象,并将注意力集中在正确预测锁孔深度和焊池尺寸上,这是描述焊接接头力学特性的最重要参数。在考虑锁孔形成过程中材料的正交异性特性的基础上,提出了被动单元的概念。特别是,新方法已在厚度为0.5 mm的两块重叠DC04钢板(所谓的三明治)的脉冲激光焊接过程中进行了测试,并通过不同输入参数(如功率、脉冲持续时间和频率、速度和几何图案)的实验测试进行了验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A mesoscale approach to simulate residual deformations in complex laser welding processes
Laser welding can be characterized by very small radii of beam, in the order of tenths of a millimeter, and very short high power inputs (more kW in few ms), and thus, it can be certainly classified as a microscale process with a high level of physical complexity. This is clearly incompatible, due to the high computational costs, with the analysis of macroscale processes related to large geometries and non-uniform welding patterns. In order to overcome this issue, a simplified finite element method (FEM)–based thermo-elastoplastic model is presented to simulate heat transfer and residual deformations due to thermal expansion and material plasticity. The idea is to substitute the microscale analysis with a mesoscale approach that renounces to describe in detail all the physical phenomena occurring in the heated zone and focuses attention on the correct prediction of the keyhole depth and weld pool size, that are the most important parameters to describe the mechanical characteristics of the welded joint. The concept of passive element, based on the numerical adjustment of the material properties in order to take into account the orthotropic behavior during the keyhole formation, is introduced. In particular, the new approach has been tested on the pulsed laser welding process of two overlapping DC04 steel plates with thickness of 0.5 mm (so-called sandwich) and validated through experimental tests involving different input parameters, such as power, pulse duration and frequency, speed, and geometrical pattern.
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来源期刊
CiteScore
3.50
自引率
31.20%
发文量
60
审稿时长
3 months
期刊介绍: SIMULATION is a peer-reviewed journal, which covers subjects including the modelling and simulation of: computer networking and communications, high performance computers, real-time systems, mobile and intelligent agents, simulation software, and language design, system engineering and design, aerospace, traffic systems, microelectronics, robotics, mechatronics, and air traffic and chemistry, physics, biology, medicine, biomedicine, sociology, and cognition.
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