Fatigue analysis for a multi-lap spot welded joint of high strength steel using quasi static tensile-shear test

2008 ◽  
Vol 9 (1) ◽  
pp. 81-86 ◽  
Author(s):  
S. R. Sin ◽  
S. M. Yang ◽  
H. S. Yu ◽  
C. W. Kim ◽  
H. Y. Kang
Keyword(s):  
High Strength Steel ◽  
Shear Test ◽  
Welded Joint ◽  
High Strength ◽  
Fatigue Analysis ◽  
Tensile Shear ◽  
Static Tensile ◽  
Spot Welded

Fatigue Analysis of Multi-Lap Spot Welding of High Strength Steel by Quasi Static Tensile- Shear Test

2007 ◽  
Vol 345-346 ◽  
pp. 251-254
Author(s):  
Su Rok Sin ◽  
Sung Mo Yang ◽  
Hyo Sun Yu ◽  
Chai Won Kim ◽  
Hee Yong Kang
Keyword(s):  
Fatigue Life ◽  
High Strength Steel ◽  
Shear Test ◽  
Welding Current ◽  
High Strength ◽  
Tensile Shear ◽  
Life Evaluation ◽  
Static Tensile ◽  
Fatigue Life Evaluation

The welding quality of spot weldment is an important factor that significantly affects the strength, stiffness, safety, and other performance characteristics of vehicles. Therefore, quality control and fatigue life evaluation of spot weldment are necessary processes. This paper presents a method for determining the fatigue life of multi-lap spot weldment of a high strength steel sheet. In this method, the fatigue life is estimated by using the lethargy coefficient, which is the total defect coefficient according to rupture stress and time obtained by the quasi static tensile-shear test. Also, in this study, we modified the lethargy coefficient by using the welding current. And, we define a specific lapping constant, which is a characteristic constant of 2 or 3 lap weldments. The fatigue life obtained by the fatigue estimate equation, which contains a specific lapping constant was compared and verified with an experimental value. And we analyzed the relation of lap number, welding current and fatigue life. This method can save processing time and cost for predicting the life cycle of a structure.

scholarly journals The Influence of the Load Variation on Fatigue Strength of the Spot Welded Joint using the High Strength Steel

2011 ◽  
Vol 10 ◽  
pp. 3405-3410
Author(s):  
Ryota Tanegashima ◽  
Hiroyuki Akebono ◽  
Masahiko Kato ◽  
Atsushi Sugeta
Keyword(s):  
Fatigue Strength ◽  
High Strength Steel ◽  
Welded Joint ◽  
High Strength ◽  
Load Variation ◽  
Spot Welded

Enhancement of the tensile shear strength for joining low-ductility aluminium to high-strength steel by using electrically-assisted mechanical clinching (EAMC)

2021 ◽  
pp. 095440542199565
Author(s):  
Abozar Barimani-Varandi ◽  
Abdolhossein Jalali Aghchai
Keyword(s):  
Shear Strength ◽  
High Strength Steel ◽  
High Strength ◽  
Fe Model ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Electroplastic Effect ◽  
Fracture Displacement ◽  
Electrically Assisted ◽  
Mechanical Clinching

The present work studied the enhancement of the tensile shear strength for joining AA6061-T6 aluminium to galvanized DP590 steel via electrically-assisted mechanical clinching (EAMC) using an integrated 2D FE model. To defeat the difficulties of joining low-ductility aluminium alloy to high-strength steel, the electroplastic effect obtained from the electrically-assisted process was applied to enhance the clinch-ability. For this purpose, the results of experiments performed by the chamfering punches with and without electrically-assisted pre-heating were compared. Joint cross-section, failure load, failure mode, fracture displacement, material flow, and failure mechanism were assessed in order to study the failure behaviour. The results showed that the joints clinched at the EAMC condition failed with the dominant dimpled mechanism observed on the fracture surface of AA6061 side, achieved from the athermal effect of the electroplasticity. Besides, these joints were strengthened 32% with a much more fracture displacement around 20% compared with non-electrically-assisted pre-heating.

Sign in / Sign up

Export Citation Format

Share Document