Simulation of the residual stresses in the contour laser welding of thermoplastics

The prime aim of this paper is to investigate, with the help of experiments, the induced anisotropy of mechanical properties in polycarbonate films. It is known that a molecular orientation in polymer materials occurs through cold-forming. In this study, cold forming is performed at room temperature on a tensile testing machine. The polycarbonate films are examined in two phases. In the first phase, the specimen is loaded, while the prestrain is varied, and in the second, it is loaded, while the material direction is varied. The main findings are that the prestrain has virtually no influence on the anisotropy and that the material direction does exert a major influence. Furthermore, this paper summarizes comparisons of anisotropic characteristic data, maximum stresses, elasticity moduli and failure strain.

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“…with modeling the material behavior under complex stress and strain states as in [14][15][16]. The results described here are only a start.…”

Section: Discussionmentioning

confidence: 99%

Experimental Investigations on the Induced Anisotropy of Mechanical Properties in Polycarbonate Films

Wibbeke

Schöeppner

Mahnken

2013

ISRN Materials Science

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“…The adherend that is transparent to the laser beam heats up through thermal conduction, therefore the adherends weld together. The reader is referred to Potente et al (2006), Shaban et al (2007) and Potente et al (2008) for a detailed description of the LTW process.…”

Section: Principle and Modelling Of Laser Transmission Weldingmentioning

confidence: 99%

Thermoviscoplastic modelling of asymmetric effects for polymers at large strains

Mahnken

Shaban

Potente

et al. 2008

International Journal of Solids and Structures

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a b s t r a c tGlassy polymers such as polycarbonate exhibit different behaviours in different loading scenarios, such as tension and compression. To this end a flow rule is postulated within a thermodynamic consistent framework in a mixed variant formulation and decomposed into a sum of weighted stress mode related quantities. The different stress modes are chosen such that they are accessible to individual examination in the laboratory, where tension and compression are typical examples. The characterisation of the stress modes is obtained in the octahedral plane of the deviatoric stress space in terms of the Lode angle, such that stress mode dependent scalar weighting functions can be constructed. Furthermore the numerical implementation of the constitutive equations into a finite element program is briefly described. In a numerical example, the model is used to simulate the laser transmission welding process.

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“…Some outstanding developments of FE analysis of laser welding have been detailed (Mayboudi et al , 2009; Mayboudi et al , 2010; Shanmugam et al , 2009; Buvanashekaran et al , 2009; Mahnken et al , 2008; Potente et al , 2008).…”

Section: Introductionmentioning

confidence: 99%

Fast and accurate multi-material model for the prediction of laser welded structural response

Arif

Naceur

Miran

et al. 2021

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Purpose The purpose of this study is to develop an elasto-plastic multi-material shell model by which finite element analysis of laser welded joints is carried out at the interface of the heat-affected zone and base material. Design/methodology/approach The multi-material shell model is implemented on the simple cantilever and double cantilever welded plates to examine the efficiency of the developed model. Findings By reducing the computational time approximately 20 times with the developed model, the results obtained in the form of von Mises stress and equivalent plastic strain are found in good agreement as compared with the reference solid model. Originality/value The accurate and fast prediction of the stresses and strains in the laser welded joints, and the developed multi-material model is helpful to simulate complex industrial welded structures.

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Simulation of the residual stresses in the contour laser welding of thermoplastics

Cited by 10 publications

References 6 publications

Experimental Investigations on the Induced Anisotropy of Mechanical Properties in Polycarbonate Films

Experimental Investigations on the Induced Anisotropy of Mechanical Properties in Polycarbonate Films

Thermoviscoplastic modelling of asymmetric effects for polymers at large strains

Fast and accurate multi-material model for the prediction of laser welded structural response

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