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A J-Integral Approach to Fatigue Resistance of a Tensile-Shear Spot Weld
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Abstract
A J-integral approach was used in this study fco predict the fatigue lives of spot welds subjected to tensile-shear loads. Using a three-dimensional finite element program, J-integral values were computed for spot welds that reflect the overall weld stiffness. Two types of welds were analyzed; conventional solid welds that joined two sheets of low carbon (LC) steel, and annular-shaped welds that resulted from joining a steel sheet to a steel square tube. The latter combination is representative of the joint configuration found in space frame construction.
Fatigue tests were conducted on conventional and annular-shaped welds. The experimental results, together with others found in the literature, were used to define a relationship between a J-integral range (ΔJ) and fatigue life data. It was found that the total fatigue life (Nf) of a weld at one applied stress range is related to its J-integral range such that a ΔJ vs. Nf log-log plot gives a straight line relationship. This relationship holds for different steel gages and weld shapes, and thus can be used to predict fatigue lives of spot welded assemblies where there are multiple welds joining various steels of different gages.
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Wang, P. and Ewing, K., "A J-Integral Approach to Fatigue Resistance of a Tensile-Shear Spot Weld," SAE Technical Paper 880373, 1988, https://doi.org/10.4271/880373.Also In
References
- Wang, P. C. Corten H. T. Lawrence F.V. “A Fatigue Life Prediction Method for Tensile-Shear Spot Welds” SAE Paper 850370 1985
- Davidson, J. A. “A Review of The Fatigue Properties of Welded Sheet Steel” SAE Paper 830033 Feb. 1983
- Pook, L. P. “Fracture Mechanics Analysis of The Fatigue Behavior of Spot Welds” International Journal of Fracture Vol. 11 173 176 1975
- Yuuki, R. Ohira, T. Nakatsukasa H. Yi, W. “Fracture Mechanics Analysis of the Fatigue Strength of Various Spot Welded Joints” Symposium ‘Resistance Welding and Related Processes - Osaka’ in conjunction with IIW Assembly 1986
- Satoh, T. Katayama J. Morii, Y. “Fatigue Strength of Multi-Spot Welded Joints” Document No. III-638-80 I.I.W. 1980
- Abe, H. Kataoka S. Satoh, T. “Empirical Formula for Fatigue Strength of Single-Welded Joint Specimens Under Tensile-Shear Repeated Load” SAE Paper 860606 1986
- Davidson J. A. Imhof, E. J. Jr “The Effect of Tensile Strength on the Fatigue Life of Spot-Welded Sheet Steels” SAE Paper 840110 1984
- Aoyama Fujimoto The Japan Welding Society Doc. No. RWS-41-77 1977
- Kudoh, Japanese Society of Automobile Engineering, Committee on Fatigue Strength and Structural Reliability -Symposium, A-6 61 65 1978
- Minagawa, Japanese Society of Automobile Engineering, Committee on Fatigue Strength and Structural Reliability -Symposium, A-8 69 71 1978
- Orts, D. H. “Fatigue Strength of Spot Welded Joints in a HSLA Steel” SAE Paper 810355 1981
- Kabasavra, Nagae Ono, The Japan Welding Society Doc. No. RW-278-84 1984
- Mizui, Sekine Torai, Japanese Society of Automobile Engineering, Committee on Fatigue Strength and Structural Reliability - Symposium 52 56 1984
- Rice, J. R. J. Appl. Mech. Trans. Vol. 35 379 386 1968
- Wang, P. C. “A Mesh Generator for Spot Welds”
- Barsoum, R. S. “On the Use of Isoparametric Finite Elements in Linear Fracture Mechanics” International Journal For Numerical Methods in Engineering Vol. 10 25 37 1976
- Parks, D. M. “A Stiffness Derivation Finite Element Technique for Determination of Crack Tip Stress Intensity Factors” International Journal of Fracture Vol. 10 No. 4 487 502 Dec. 1874
- Paris P. C. Erdogan, F. “A Critical Analysis of Crack Propagation Laws” Transactions of the ASME, J: of Basic Engineering, Series D 85 No. 3 1963
- Chandel R. S. Garber, S. “Mechanical Aspects of Spot-Welded Joints in Heated-Treated Low-Carbon Mild-Steel Sheets” Metals Technology 37 44 1977