Measurement and assessment of fatigue life of spot-weld joints
Yükleniyor...
Dosyalar
Tarih
2009-01
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Asme-Amer Soc Mechanical Eng
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Spot-weld joints are commonly used to fasten together metal sheets. Because fatigue fracture is the most critical failure mode for these joints under fluctuating loads, understanding their fatigue failure behavior and assessment of their fatigue lives are crucial from the viewpoint of failure prevention in design. In this study, a series of experiments was conducted to study the fatigue failure of spot-welded modified tensile-shear specimens made of a low carbon steel. Two different types of resistance spot welding were investigated (manual and automated). Tests were repeated under different load ranges, and the corresponding fatigue lives were determined. The specimens were also examined under an optical microscope. In the numerical part of this study, a finite element analysis was carried out using commercial software, ANSYS, to determine the stress and strain states within the specimens. The material nonlinearity, local plastic deformations around the welds during loading, and the residual stresses and strains developed after unloading as a result of plastic deformations were taken into account. Based on the predicted stress and strain states, fatigue analyses were performed using several models for life assessment. Then, the measured and predicted fatigue lives were compared, and the suitability of the models was discussed. Among the strain-based models, Coffin-Manson and Morrow's means stress models yielded the best predictions.
Açıklama
Anahtar Kelimeler
Carbon steel, Fatigue testing, Finite element analysis, Internal stresses, Optical microscopy, Plastic deformation, Sheet materials, Spot welding, Stress-strain relations, Tensile strength, Finite-element, Sheet steels, Prediction, Resistance, Strength, Behavior, Tensile, Specimen, Stresses, Model, Elasticity, Finite element method, Low carbon steel, Strain, Structural design, Unloading, Welds, Commercial software, Fatigue fracture, Local plastic deformation, Material non-linearity, Modified tensile shear specimen, Residual stresses and strains, Resistance spot welding, Tensile shears, Fatigue of materials
Kaynak
Journal of Engineering Materials and Technology-Transactions of The Asme
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
131
Sayı
1
Künye
Ertaş, A. H., Vardar, Ö., Sönmez, F. O. & Solim, Z. (2009). Measurement and assessment of fatigue life of spot-weld joints. Journal of Engineering Materials and Technology, Transactions of the ASME, 131(1), 1-11. doi:10.1115/1.3030941
