Finite Element Modeling Of Impact Strength Of
Laser Welds For Automotive Applications
Author(s)
N. Kuppuswamy, R. Schmidt, F. Seeger & S. Zhang
Abstract
Laser welding is increasingly applied in the automotive industry to assemble
sheet structures due to its efficiency and reliability. However, the numerous
material and gauge combinations pose a major challenge in characterizing and
understanding the crash behavior of the welded joints. Body-in-white (BIW)
structures normally have numerous laser welded joints along with other kinds of
joints like adhesive bonding, spot welds etc. Owing to limitations in computing
time, the structures with all these kinds of joints have to be modeled with coarse
finite element meshes. Simplified or substitute joint models with just one or few
elements but with correct representation of geometry and stiffness of the joint are
largely desired in practice. This paper will discuss such modeling techniques,
including element selection, choice of material models for the weld etc. The type
and dimension of the weld model is fixed and validated on experimental crash
test results. An empirical relationship is then developed which covers the
numerous physical effects like sheet thickness, static and dynamic strength and
failure behavior of the joint. A general description of the model and some
recommendations for application of the model where coarse meshes are involved
for both welds and flanges are given as well.
Keywords: laser welding, material and gauge combinations, crash, coarse finite
element meshes, substitute joint models, element selection, material.
1 Introduction
Substantial amount of progress has been done so far to improve the crash
worthiness of passenger cars. A car body typically has a huge number of welded
joints. During crash it is not just the body of the car that gets deformed but also
Keywords
laser welding, material and gauge combinations, crash, coarse finite
element meshes, substitute joint models, element selection, material.
Related Book
Other papers in this volume
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