Investigation on residual stress distribution in thin plate subjected to two sided laser shock processing

Identification of constitutive equations at very high strain rates using shock wave produced by laser

“…1.00 0.5 1.0 3.8 × 10 −3 10.0 × 10 −3 Ti6Al4V-ELI 0.38 0.3 0.7 3.5 × 10 −3 16.9 × 10 −3 Hu et al, 2006). Isotropic strain hardening through the Johnson-Cook was also used (Peyre et al, 2003;Ivetic, 2011;Hfaiedh et al, 2015;Zhang et al, 2019). However, the criterion to choose the parameters 𝐾 and 𝑛 is not indicated.…”

“…The 𝐶 parameter was adjusted to successfully represent the elastic precursor and was found equal to 0.01 and 0.04, respectively for 7175-T7351 alloy and Ti6Al4V-ELI. The 𝐶 value for 7175-T7351 alloy is the same as the 𝐶 parameter used in Zhang et al (2019). It provides a 𝑃 𝐻𝐸𝐿 and a dynamic yield stress at 10 6 s −1 of 920 MPa and 500 MPa, respectively.…”

Numerical Simulation on Laser Shock Peening of B4C-TiB2 Composite Ceramics

“…The effect of key LSP parameters such as laser energy [ 22 ], laser spot overlapping rate [ 23 ], number of impacts [ 24 ], and laser spot shape [ 25 ] on the residual stress distribution was investigated using finite element simulations. Zhang et al [ 26 ] carried out finite element simulations of double-sided laser shock peening on a thin plate of 7075-T7351 alloy to study the propagation and decay of LSP-induced shock waves in the plate thickness direction. The simulation results showed that the stress wave energy gradually decayed with the increase in propagation distance.…”

Numerical Study on Laser Shock Peening of Pure Al Correlating with Laser Shock Wave

“…Yang et al [ 24 ] explored the formation mechanism of the surface residual stress hole induced by LSP by analyzing the propagation and reflection of the laser plasma-induced shock wave, and found that the residual stress hole occurring in the thin plate subjected to the two-side laser shock peening is attributed to the co-action between the convergence of unloading surface stress emitted from the boundary of laser spot and axial stress wave going back and forth between two shocked side surfaces. Zhang et al [ 25 ] carried out the three-dimensional finite element simulation of two side laser shock processing of the 7075-T7351 alloy plate with the thickness of 2 mm, and the dynamic propagation and attenuation process of the LSP-induced shock waves in the thickness direction of the plate was investigated, the simulation results reveal that the interaction between target material and LSP-induced stress wave gradually decays with the increase in the propagation distance. Xiang et al [ 26 ] utilized the finite element method to investigate the dynamic propagation characteristics of stress waves induced by LSP with the round and square spots, and found that the dynamic stress distributions induced by the two kinds of spots are quite different at the same time, but the final residual stress distributions are basically the same.…”