Stress analysis based on strain measurement in sheet metal laser bending

Tetzel, Hendrik; Grden, Martin; Vollertsen, Frank

doi:10.1007/s11740-013-0488-9

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…The majority of laser forming setups use free convection with the surrounding air to cool the workpiece, which is relatively slow and leads to a pronounced increase in processing time (Figure 7a). In fact, cooling can be the longest part of a laser forming process [52,59,86,107]. To reduce the processing time, researchers have proposed multiple methods for forced cooling such as forced convection with compressed gas streams aimed at either side (Figure 7b) [92,108], passive water cooling with the bottom of the workpiece being placed in a water bath (Figure 7c) [109][110][111], and forced liquid cooling, such as a circulated cooling fluid placed in contact with the bottom of the substrate (Figure 7d) [112][113][114][115].…”

Section: Cooling Effects In Laser Formingmentioning

confidence: 99%

Making Light Work of Metal Bending: Laser Forming in Rapid Prototyping

Bachmann

Dickey

Lazarus

2020

QuBS

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Lasers can be used to bend 2D metal sheets into complex 3D objects in a process called ‘laser forming.’ Laser forming bends metal sheets by locally heating the sheets to generate plastic strains and is an established metal bending technology in the shipbuilding industry. Recent studies have investigated the laser forming of thin metal parts as a complementary rapid prototyping technology to metal 3D printing. This review discusses the laser forming process, beginning with the mechanisms before covering various design considerations. Laser forming for the rapid manufacturing of metal parts is then reviewed, including the recent advances in process planning, before highlighting promising future research directions.

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Section: Cooling Effects In Laser Formingmentioning

confidence: 99%

Making Light Work of Metal Bending: Laser Forming in Rapid Prototyping

Bachmann

Dickey

Lazarus

2020

QuBS

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“…Because of that nowadays numerical simulations of thermal forming processes are well established and widely used, so for steel materials. Especially austenitic steels are extensively researched at BIAS for example of Tetzel et al (2013). Relating to simulations of materials running through phase transformation it is state of the art to use one single continuous-cooling-transformation-diagram (cct-diagrams) for an entire model consisting of one material.…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Formation Relating to Peak Temperature- and Austenite Grain Size-based Phase Transformation of S355 Steel

Klaproth

Vollertsen

2014

Physics Procedia

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Nowadays thermal forming processes of steel are state of the art in industrial applications. Nevertheless, the influences of thermal induced phase-transformation on residual stresses and strength have not been fully observed. Times needed for transformation are affected by the initial austenite grain size, while the prevailing peak temperature influences austenite grain growth. Higher temperatures lead to larger austenite grains, leading to increased times for transformation. In order to get an embraced understanding of such effects numerical simulations of phase-transformations are mandatory. In this paper simulations of thermal forming processes, using S355 steel, are presented. Different continuous-cooling-transformationdiagrams (cct-diagrams) of specific austenite grain sizes for temperatures between transformation point AC3 and melting temperature are implemented in the model. It is shown that resulting magnitudes of residual stresses vary between 248 N/mm² and 550 N/mm². Finally an approach for the impact on relevant peak temperatures in the heat affected zone is outlined.

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Influence of peak temperature on formation of residual stresses according to behavior of S355 steel

Klaproth¹,

Vollertsen²

2014

International Congress on Applications of Lasers &Amp; Electro-Optics

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Stress analysis based on strain measurement in sheet metal laser bending

Cited by 3 publications

References 9 publications

Making Light Work of Metal Bending: Laser Forming in Rapid Prototyping

Making Light Work of Metal Bending: Laser Forming in Rapid Prototyping

Residual Stress Formation Relating to Peak Temperature- and Austenite Grain Size-based Phase Transformation of S355 Steel

Influence of peak temperature on formation of residual stresses according to behavior of S355 steel

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