TY - JOUR

T1 - Application of design of experiments for laser shock peening process optimization

AU - Chupakhin, Sergey

AU - Klusemann, Benjamin

AU - Huber, Norbert

AU - Kashaev, Nikolai

PY - 2019/6/19

Y1 - 2019/6/19

N2 - Laser shock peening—a very promising life enhancement technique—has demonstrated great success regarding the improvement of fatigue behavior via deep compressive residual stresses. However, the prediction and adaption of residual stress fields on basis of the laser peening parameters are still not comprehensively established. The aim of the current work is to investigate the effects of the laser pulse energy, the number of treatment overlaps as well as the laser spot size on the resulting residual stress distribution, characterized by following quantities: the residual stress close to the surface, the maximum compressive residual stress, and the integral compressive stress area over the specimen depth. For a systematic investigation of all main and interaction-based process parameter effects, and a subsequent parameter optimization, the general full factorial design is employed. The results show that laser shock peening with different process parameter combinations, inducing residual stresses with comparable integral stress area, can lead to a minimum fatigue life extension of approx. 100,000 cycles, representing a minimum fatigue life of 250% of the base material. The experimental scatter in the number of cycles to failure follows the Weibull distribution which qualitatively correlates with the standard deviation of the integral stress area.

AB - Laser shock peening—a very promising life enhancement technique—has demonstrated great success regarding the improvement of fatigue behavior via deep compressive residual stresses. However, the prediction and adaption of residual stress fields on basis of the laser peening parameters are still not comprehensively established. The aim of the current work is to investigate the effects of the laser pulse energy, the number of treatment overlaps as well as the laser spot size on the resulting residual stress distribution, characterized by following quantities: the residual stress close to the surface, the maximum compressive residual stress, and the integral compressive stress area over the specimen depth. For a systematic investigation of all main and interaction-based process parameter effects, and a subsequent parameter optimization, the general full factorial design is employed. The results show that laser shock peening with different process parameter combinations, inducing residual stresses with comparable integral stress area, can lead to a minimum fatigue life extension of approx. 100,000 cycles, representing a minimum fatigue life of 250% of the base material. The experimental scatter in the number of cycles to failure follows the Weibull distribution which qualitatively correlates with the standard deviation of the integral stress area.

KW - Engineering

KW - Laser-Shock-Peening

KW - Laser shock peening

KW - Design of experiments

KW - Fatigue crack growth

KW - Residual stress

KW - Hole drilling

KW - Design of experiments

KW - Fatigue crack growth

KW - Hole drilling

KW - Laser shock peening

KW - Residual stress

UR - http://www.scopus.com/inward/record.url?scp=85059837899&partnerID=8YFLogxK

U2 - 10.1007/s00170-018-3034-2

DO - 10.1007/s00170-018-3034-2

M3 - Journal articles

VL - 102

SP - 1567

EP - 1581

JO - The International Journal of Advanced Manufacturing Technology

JF - The International Journal of Advanced Manufacturing Technology

SN - 0268-3768

IS - 5-8

ER -