Optimization of spot-weld joints

Ertas, Ahmet H.; Sonmez, Fazıl O.

doi:10.1243/09544062jmes1171

Cited by 12 publications

(6 citation statements)

References 21 publications

(31 reference statements)

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“…For this reason, many researchers preferred global search algorithms such as the SA algorithm [16,[18][19][20][21] which have some advantages such as easily convergence to the global minimum even if expensive in computational time. For example, unlike zero-order deterministic methods such as Nelder-Mead or simplex search method [18][19][20][21][22], SA provides global optimum allowing for escape from local minimum values.…”

Section: Search Algorithm (Dsa)mentioning

confidence: 99%

Design optimization of composite structures for maximum strength using direct simulated annealing

Ertas

Sonmez

2010

Proceedings of the Institution of Mechanical Engineers, Part C:

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Composite materials have been used in many structural applications because of their superior properties. Although composites are less sensitive to deformation, their increased use has emphasized that their deformation behaviours and hence deformation analyses are more complex than for structures of uniform composition. Deformation patterns contingent upon fatigue properties of composites may vary significantly because of the large differences in properties of the fibres and matrix, and the compositions of their sub-constituents. These complexities introduce major deficiencies to methods for composite materials, which often force large factors of safety to be adopted in designs. Consequently, composite structures used in fatigue applications are generally over-designed to eliminate catastrophic failure and are therefore heavier and more costly. Accordingly, the objective of this study is to develop a methodology to maximize the load-carrying capacity or strength of composite structures by minimizing the maximum stress. A stochastic global search algorithm called the direct search simulated annealing is employed in the optimization procedure. The methodology is applied to different types of problems to demonstrate the effectiveness and reliability of the proposed method.

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Section: Search Algorithm (Dsa)mentioning

confidence: 99%

Design optimization of composite structures for maximum strength using direct simulated annealing

Ertas

Sonmez

2010

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…They also mentioned that the mesh should be refined and uniform in the vicinity of the RSWs for reliable results. Recently, Ertas and Sonmez [3] proposed another optimization algorithm for the same problem based on a Nelder-Mead Simplex method and stated that the results are comparable to those in [2].…”

Section: Introductionmentioning

confidence: 96%

An adaptive optimization procedure for spot-welded structures

Bhatti¹,

Ouisse²,

Cogan³

2011

Computers & Structures

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a b s t r a c tThe behavior of a spot welded structure under dynamic loads is strongly influenced by the number and locations of the resistance spot welds. The design problem requires the number and locations of spot welds to be optimized so as to obtain reasonable trade-offs between manufacturing cost and structural performance. An adaptive optimization procedure is proposed which iteratively adds and removes spot welds based on decision indicators in order to correct for the approximations made in the iterative process. In practice, it is possible that some spot welds may be defective or even missing when structure leaves the assembly line. Therefore, a simple robustness indicator is formulated to characterize the impact of the number of defective or missing spot welds on the system performance. This indicator provides a useful decision making tool for deciding both how many spot welds should be inspected following assembly as well as pointing to a small number of critical spot welds that should be reinforced. The proposed methodologies will be illustrated on a full body-in-white structure for a car.

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“…Numerous welding parameters including metal sheet thickness, 1 metal sheet width, 12 number of spot welds, 1,21 location of spot welds, 21 spot-weld diameter, 1,2 material 9,10,13 and the gab value between the overlapping sheets 3 have been examined through numerical or experimental approaches in literature.…”

Section: Introductionmentioning

confidence: 99%

“…The process of resistance spot welding was analyzed in different research works. Some of them 1,2,21 are parametric studies, some others 12,19–21 are optimization studies to increase the life span of the spot welded sheet metals or investigation of spot –weld adhesive interaction. 7…”

Section: Introductionmentioning

confidence: 99%

Parametric investigation into fatigue life behaviour of spot welded tensile shear test samples

Akbulut

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Resistance spot welding is a widely used joining process in the structural components of various engineering products such as white goods, aerospace equipment and especially automobiles. Hence it is crucial that the mechanical performance of such joints be well understood in order to design and manufacture reliable engineering products. In service, Spot-welded joints undergo fatigue failure under cyclic loadings. In order to examine and improve the fatigue life of spot welded structures, various assessment methods have been used on standardized test samples such as tensile shear (TS), modified tensile shear (MTS), coach peel (CP) and modified coach peel (MCP) specimens. The fatigue life studies have shown that among the most important design variables for spot-welded structures influencing joint strengths, sheet thickness, spot weld nugget diameter, number of spot welds and the joint type can be counted. In this study, a numerical examination was carried out to observe the effects of sheet thickness and nugget diameter on the fatigue life of tensile shear (TS) samples. In the analysis both Morrows mean stress and Coffin Manson approach were utilized. The performance of both methods was verified on the basis of experimental data available in literature. The elastic and plastic strains necessary for the calculations were found out by means of finite element method. The results presented herein provide variation of fatigue life predictions according to selected geometry parameters along with valuable interpretations that can be used as guidelines for designers.

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Optimization of spot-weld joints

Cited by 12 publications

References 21 publications

Design optimization of composite structures for maximum strength using direct simulated annealing

Design optimization of composite structures for maximum strength using direct simulated annealing

An adaptive optimization procedure for spot-welded structures

Parametric investigation into fatigue life behaviour of spot welded tensile shear test samples

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