Fussy Assessment of Fatigue Strength of Spot-Welded Structures

2012 ◽  
Vol 562-564 ◽  
pp. 2030-2033
Author(s):  
Yu Xin Yao ◽  
Chun Yuan Shi
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Standard Specimen ◽  
Point Of View ◽  
Fuzzy Mathematics ◽  
Welded Structures ◽  
Coupling Relationship ◽  
Welded Structure ◽  
Assessment Result ◽  
Spot Welded

From the point of view of the objective and scientific design of spot-welded structures, each factor that influences the fatigue strength of the spot-welded structure is quantitatively analyzed using fuzzy mathematics. The weighing coefficient is calculated based on the contribution of each factor and their coupling relationship using DARE method. All the influencing factors are divided to two levels, and quantitative assessment result is obtained. Finally, the fatigue life curve of the spot-welded structure is predicted with the utilization of the fatigue life curve of a standard specimen made of the same material.

EFFECT OF FATIGUE TEST ON SPOT WELDED STRUCTURAL JOINT

2017 ◽  
Vol 79 (5-2) ◽  
Author(s):  
Mohammad Khalid Wahid ◽  
Muhammad Nabil Muhammed Sufian ◽  
Mohamed Saiful Firdaus Hussin
Keyword(s):  
Life Cycle ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Spot Welding ◽  
Fatigue Testing ◽  
Fatigue Stress ◽  
Component Design ◽  
Welded Structure ◽  
Different Thickness ◽  
Spot Welded

Spot welding is mainly used method in joining sheet metals for body structure in automotive industry. The comprehension of the fatigue strength for the spot welds is very critical in automotive component design. Parameter for the resistance spot welding and fatigue machines is constant for each specimen used. The S-N curve is obtained from the fatigue testing for each specimen. This experiment parameters are varies the different thickness and different material combination in spot welding structure to investigate the fatigue life cycle and fatigue stress. For 1050A aluminium joint, fatigue life cycle and fatigue strength will decrease from number of cycle 500 at 16.58 MPa to number of cycle 61 at 6.62 MPa as the thickness increase. The fatigue life cycle and fatigue stress for galvanized iron will increase from number of cycle  46 at 9.25 MPa to number of cycle  1500 at 57.8 MPa when the thickness of joint increase. The finding from the combination of 1050A aluminum and galvanized iron on spot welded structure has shown no improvement in term of fatigue life cycle and fatigue strength because specimens experienced failure at number of cycle 19 with fatigue stress 2.36 MPa.

The Fatigue Life Prediction Method for Multi-Spot-Welded Structures

1993 ◽  
Author(s):  
Y. Rui ◽  
R. S. Borsos ◽  
R. Gopalakrishnan ◽  
H. N. Agrawal ◽  
C. Rivard
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Prediction Method ◽  
Fatigue Life Prediction ◽  
Welded Structures ◽  
Spot Welded

Method of Fatigue Life Estimation for Spot Welded Structures

2002 ◽  
Author(s):  
Takashi Sawamura ◽  
Noboru Tomioka ◽  
Toshi Matsumoto ◽  
Akifumi Okabe
Keyword(s):  
Fatigue Life ◽  
Welded Structures ◽  
Life Estimation ◽  
Fatigue Life Estimation ◽  
Spot Welded

Fatigue Life of Multi-Spot Welded Structures

2007 ◽  
Vol 348-349 ◽  
pp. 249-252
Author(s):  
Pietro Salvini ◽  
Francesco Vivio ◽  
Vincenzo Vullo
Keyword(s):  
Fatigue Life ◽  
Numerical Solution ◽  
Welded Joints ◽  
Structural Model ◽  
Fatigue Behaviour ◽  
Progressive Damage ◽  
Welded Structures ◽  
Accumulated Damage ◽  
Fatigue Data ◽  
Spot Welded

A procedure that makes use of a conventional stress value (ERS) is applied to spot welded joints. The ERS can be evaluated for every spot weld of the structural model. Through the use of ERS-N curves, fatigue data performed on different joint geometries can be successfully mixed together. One of the main aspects is that progressive damage deeply influences fatigue behaviour, so that a simple numerical solution neglecting accumulated damage is unable to foresee the whole fatigue life. In the present paper the method has been applied to many experimental results: it is shown that a unique criterion is able to deal with several different structures and materials.

scholarly journals Design Implications and Opportunities of Considering Fatigue Strength, Manufacturing Variations and Predictive LCC in Welds

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1527
Author(s):  
Mathilda Karlsson Hagnell ◽  
Mansoor Khurshid ◽  
Malin Åkermo ◽  
Zuheir Barsoum
Keyword(s):  
Life Cycle ◽  
Fatigue Strength ◽  
Life Cycle Cost ◽  
Design Stage ◽  
Direct Result ◽  
Welded Structures ◽  
Early Design Stage ◽  
Repair Costs ◽  
Welded Structure ◽  
Cost Reductions

Fatigue strength dictates life and cost of welded structures and is often a direct result of initial manufacturing variations and defects. This paper addresses this coupling through proposing and applying the methodology of predictive life-cycle costing (PLCC) to evaluate a welded structure exhibiting manufacturing-induced variations in penetration depth. It is found that if a full-width crack is a fact, a 50% thicker design can result in life-cycle cost reductions of 60% due to reduced repair costs. The paper demonstrates the importance of incorporating manufacturing variations in an early design stage to ensure an overall minimized life-cycle cost.

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