Efficient Eigenstrain Model for Laser Peen Forming of Panels with Stiffening Rib

Author:  Yongxiang Hu, Xiongchao Yu, Rongxue Yang, Zhenqiang Yao
Source:  ICSP-13
Doc ID:  2017135
Year of Publication:  2017
Abstract:  
Introduction: Laser peen forming (LPF), a derivative of laser peening, is a locally effective forming process to form complex curvatures without dies. It is now emerging as a viable means for the shaping of large scale panels with stiffening ribs. Shape prediction of large scale panel after laser peen forming is challenge due to high computation cost to simulate a large amount of laser shocks[1]. Therefore, developing an efficient way is expected to simulate laser peen forming process and predict the geometry shape. Eigenstrain-based modelling has been proposed as an effective method to predict the geometry shape of a large scale specimen with small curvatures. Korsunsky predicted the deformed plate shape, residual stresses and strains after shot peening treatment with the prescribed distribution of eigenstrain[2]. DeWald and Hill used contour method to measure residual stress and established a model with laser peening induced eigenstrain for a range of material thickness[3]. Hu and Grandhi proposed an eigenstrain-based numerical model to predict the LPF processes efficiently [4].