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Methods for Determination of Residual Stress of a Formed Plate using Laser Ablation, Wire EDM and Milling

Lamsa J, Mantyjarvi K, Jarvenpaa A, Grüner M, Merklein M, Karjalainen JA (2011)

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Publication Type: Journal article

Publication year: 2011

Journal

Publisher: None

Book Volume: 473

Pages Range: 368-375

ISBN: 9783037850831

DOI: 10.4028/www.scientific.net/KEM.473.368

Abstract

In this work laser ablation was used for the determination of residual stress of a formed plate. Manufacturing processes, like bending, create residual stresses in the product and those can be very disadvantageous for fatigue durability. Residual stresses that are generated during the manufacturing of products can cause distortions, dimensional errors or can even break the products. The research material was ultra-high-strength steel (UHSS) with a yield strength of 1100 MPa. Specimens with a 90 degree bent angle were made by air bending using a press brake. Air bending causes variable residual stress patterns in the cross section of the material. The residual stresses of the formed area were determined by removing material and measuring strains caused by the release of stresses. A slot with the width of 1 mm has been manufactured parallel to the edge, both on the outer and on the inner side of the bend. True residual stress distribution can be calculated from the measured strains. A pumped 1064 nm Nd:YVO 4 ablation laser, whose pulse length is 90 ns, was used for the removal of material. This process creates a negligible heat affected zone (HAZ) and laser ablation doesn't increase stresses in the specimen. The results were compared with those obtained when slots were produced by milling and wire-EDM, as well as with the stress values measured by X-ray diffraction. © (2011) Trans Tech Publications.

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How to cite

APA:

Lamsa, J., Mantyjarvi, K., Jarvenpaa, A., Grüner, M., Merklein, M., & Karjalainen, J.A. (2011). Methods for Determination of Residual Stress of a Formed Plate using Laser Ablation, Wire EDM and Milling. Key Engineering Materials, 473, 368-375. https://dx.doi.org/10.4028/www.scientific.net/KEM.473.368

MLA:

Lamsa, Janne, et al. "Methods for Determination of Residual Stress of a Formed Plate using Laser Ablation, Wire EDM and Milling." Key Engineering Materials 473 (2011): 368-375.

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