Effects of Spot Diameter and Sheets Thickness on Fatigue Life of Spot Welded Structure based on FEA Approach

Rahman, Habibur

doi:10.3844/ajassp.2009.137.142

Cited by 18 publications

(8 citation statements)

References 21 publications

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“…1. This expression provides the basis for determination of the transverse shear stiffness, D Qy , from plotting ∆ z /PL and where L is the length of the beam, from a series of required data P, ∆ z , and L in which D Qy can be yielded from the approximate interception point on the ∆ z /PL axis (Nordstrand and Carlsson, 1997;Souiyah et al, 2009;Urgessa, 2009;Thomas and Dozier, 2010;Mohsen, 2010;Rahman et al, 2009) (1) Unit cell approach: In practice, the transverse shear stiffness of beams can also be deduced from the relationship between the applied transverse shear force, Q y and the corresponded deflections ∆ y and ∆ z of a unit cell which is a repetitive unit of a sandwich beam (Leekitwattana et al, 2011), as demonstrated in Fig. 2.…”

Section: Methodsmentioning

confidence: 99%

A Reduced Finite Element Model for Analyzing the Transverse Shear Stiffness of Truss-Like Core Sandwich Beam

Chomphan¹

2011

Journal of Computer Science

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Problem statement:In structural analysis using finite element software, a number of finite element equations affect the speed of calculation time. A reduced finite element model should be used for analyzing structural responses to reduce the calculation time. Approach: This study presents the analysis of transverse shear stiffness of truss-like core sandwich beam using the reduced finite element model based on a unit cell approach. Two kinds of core topologies; an X-truss core and a bi-directional X-truss core, were chosen to be analyzed. The presented reduced finite element model based on the unit cell approach was compared in transverse shear stiffness with the conventional three-point loaded beam approach. Results: Results showed that the unit cell approach could be used for analyzing the transverse shear stiffness of truss-like core sandwich beam with a good correlative with the conventional three-point loaded beam approach and a significantly reduced number of finite element equations. Conclusion: The transverse shear stiffness of truss-like core sandwich beam can be obtained from the reduced finite element model based on unit cell approach. This reduced finite element model can be used to reduce the number of finite element equations; consequently, the speed of calculation time is increased.

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Section: Methodsmentioning

confidence: 99%

A Reduced Finite Element Model for Analyzing the Transverse Shear Stiffness of Truss-Like Core Sandwich Beam

Chomphan¹

2011

Journal of Computer Science

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“…The reason why Timoshenko beam elements are used is the fact that spot weld nuggets behave much like a short beam and as a result, the shear effects have a significant effect on the analysis results. The detail of the adopted spot weld model is shown in Fig 3. Moreover, instead of assuming some predefined diameters for the spot weld nuggets which is proved to change the fatigue analysis results by orders of magnitude [23], the authors used the following definition for the nugget diameters which is used by the quality control units of some car manufacturers [24]. 1.27 (mm ) 6 mm for 1.…”

Section: Finite Element Model Of the Vehicle Bodymentioning

confidence: 99%

A comparative study on the fatigue life of the vehicle body spot welds using different numerical techniques: Inertia relief and Modal dynamic analyses

Farrahi

Ahmadi

Kashyzadeh

et al. 2020

Frattura Ed Integrità Strutturale

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Owing to the expensive and time-consuming nature of durability experiments, finite element based durability analysis is quite prevalent in the automotive industry. Numerical fatigue life analyses are typically divided into two different categories, the quasi-static methods which are faster and the dynamic methods which are more accurate. The aim of this paper is to compare the inertia relief and modal dynamic approaches in terms of formulation, accuracy and computation time. The chosen case study is the fatigue life of the vehicle body which is considered the main load-bearing component in a vehicle. By utilizing multi-body dynamics model and driving the vehicle on different standardized roads and by different velocities, the loadings, which act on the body are calculated and later used for the stress analysis. Then, by using the structural stress method, the fatigue life of the vehicle spot welds is calculated and the results are compared for both approaches. The findings reveal that the modal dynamic method is almost 37 times more time-consuming than the inertia relief approach, but if accuracy is desired, it can be up to 96% more accurate. Also

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“…The resistance spot welds, which are the lap joint geometry, are mainly exposed to the shear load, but the vertical load is applied. Due to the geometric shape and stress state of resistance spot welds, stress concentration occurs and fatigue cracks start around the resistance spot welds [11]. Therefore, understanding fatigue behavior, which includes crack initiation and propagation, is important to guarantee the durability and life of the car body.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behaviors of Resistance Spot Welds for 980 MPa Grade TRIP Steel

Cho

Nam

Hwang

et al. 2019

Metals

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The fatigue life of the resistance spot weld of 980 MPa grade transformation induced plasticity (TRIP) steel was investigated and failure modes and fracture surfaces according to the fatigue load were analyzed. The fatigue life according to the nugget size was observed by using two electrodes with face diameters of 8 mm and 10 mm. When an electrode face diameter with 10 mm was used, the nugget size was large, and the fatigue life was further increased. After the fatigue test, three types of failure modes were observed, namely pull-out, plug, and heat affected zone (HAZ) failure, depending on the fatigue load. The fracture surfaces in each failure mode were analyzed. In all failure modes, a crack was initiated in the HAZ region, which is the interface between the two materials in all failure modes. In the case of pull-out failure, the crack propagates as if it surrounds the nugget at the outer edge of the nugget. In the case of HAZ failure, the crack propagates in the thickness direction of the material and outward in the nugget shell. Plug failure occurs with pull-out failure and HAZ failure mixed. The propagation patterns of cracks were different for each failure mode. The reason why the failure mode and the fracture surface are different according to the fatigue load is that the propagation speed of the fatigue crack is fast when the fatigue load is relatively large and is slow when the fatigue load is low.

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Effects of Spot Diameter and Sheets Thickness on Fatigue Life of Spot Welded Structure based on FEA Approach

Cited by 18 publications

References 21 publications

A Reduced Finite Element Model for Analyzing the Transverse Shear Stiffness of Truss-Like Core Sandwich Beam

A Reduced Finite Element Model for Analyzing the Transverse Shear Stiffness of Truss-Like Core Sandwich Beam

A comparative study on the fatigue life of the vehicle body spot welds using different numerical techniques: Inertia relief and Modal dynamic analyses

Fatigue Behaviors of Resistance Spot Welds for 980 MPa Grade TRIP Steel

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