TY - CHAP

T1 - Numerical Investigation of Influence of Spot Geometry in Laser Peen Forming of Thin-Walled Ti-6Al-4V Specimens

AU - Pöltl, Dominik

AU - Keller, Sören

AU - Chupakhin, Sergey

AU - Sala, Siva Teja

AU - Kashaev, Nikolai

AU - Klusemann, Benjamin

N1 - Conference code: 25

PY - 2022/7/22

Y1 - 2022/7/22

N2 - The aviation industry demands thin-walled structures of high dimensional accuracy. Varying radii and individual use-cases, e.g. for repair purpose, require flexible forming techniques. Laser peen forming (LPF) represents such a forming process providing precise energy input by a pulsed laser over a wide energy range. Among adjustable parameters such as laser intensity and focus size, the spot shape, i.e. square and circular, is usually fixed for a specific laser system. As the spot shape is a crucial parameter, this work focuses on the effect of the spot shape on structural deformation after LPF application. Therefore, models for laser peen forming of thin-walled Ti-6Al-4V strips for LPF systems with circular and square focus shapes are set up. Geometric conditions on both focus shapes ensure equal energy input during the laser processing. The numerical simulation relies on the so called eigenstrain method, leading to a cost-efficient calculation of resulting deformation after the dynamic LPF process. Square-based peening pattern exhibit higher deflection. For increasing spot size, the deflection difference between square and circle-based patterns increase slightly.

AB - The aviation industry demands thin-walled structures of high dimensional accuracy. Varying radii and individual use-cases, e.g. for repair purpose, require flexible forming techniques. Laser peen forming (LPF) represents such a forming process providing precise energy input by a pulsed laser over a wide energy range. Among adjustable parameters such as laser intensity and focus size, the spot shape, i.e. square and circular, is usually fixed for a specific laser system. As the spot shape is a crucial parameter, this work focuses on the effect of the spot shape on structural deformation after LPF application. Therefore, models for laser peen forming of thin-walled Ti-6Al-4V strips for LPF systems with circular and square focus shapes are set up. Geometric conditions on both focus shapes ensure equal energy input during the laser processing. The numerical simulation relies on the so called eigenstrain method, leading to a cost-efficient calculation of resulting deformation after the dynamic LPF process. Square-based peening pattern exhibit higher deflection. For increasing spot size, the deflection difference between square and circle-based patterns increase slightly.

KW - bending

KW - eigenstrain

KW - Finite element analysis

KW - laser focus

KW - laser peen forming

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85140435721&partnerID=8YFLogxK

UR - https://main.scientific.net/book/achievements-and-trends-in-material-forming/978-3-0357-3750-9/ebook

U2 - 10.4028/p-9ur6l9

DO - 10.4028/p-9ur6l9

M3 - Article in conference proceedings

AN - SCOPUS:85140435721

SN - 978-3-0357-1759-4

T3 - Key Engineering Materials

SP - 2293

EP - 2302

BT - Achievements and Trends in Material Forming

A2 - Vincze, Gabriela

A2 - Barlat, Frédéric

PB - Trans Tech Publications Ltd

CY - Baech

T2 - Conference - 25th International Conference on Material Forming, ESAFORM 2022

Y2 - 27 April 2022 through 29 April 2022

ER -