Abstract
The shock effects in laser shock processing of NiTi shape memory alloy were studied by dimensional analysis and finite element simulation. The essential dimensionless parameters controlling the residual stress distribution and plastically affected depth were found to be dimensionless pressure duration and peak pressure. By adopting the constitutive model considering the martensitic transformation and plasticity of deformation induced martensite, the influence of dimensionless parameters on the shock effects of shape memory alloy was studied numerically. The numerical results reveal the scaling law of shock effects on those dimensionless parameters quantitatively and the relationship between the plastically affected depth and peak pressure was validated with experimental results. A window of the optimal processing parameters could be obtained based on this study.
Highlights
As one of the most popular active materials, shape memory alloys (SMAs) have been increasingly used as candidate materials for biomedical devices and structural applications
In a typical laser shock peening (LSP) process, the peak pressure of laser induced shock is at the level of several GPa, and the shock duration is in the nanosecond scale
A user-material subroutine (VUMAT) for shape memory alloy based on the generalized plasticity of Lubliner and Auricchio [14] was incorporated into the finite element analysis
Summary
As one of the most popular active materials, shape memory alloys (SMAs) have been increasingly used as candidate materials for biomedical devices and structural applications. DIM generated by laser shock peening (LSP) in NiTi alloys has been reported [6,7]. This makes LSP to have a great potential to treat SMA materials and generate localized DIM structure for practical applications. For traditional metallic materials such as aluminum alloy, titanium alloy alloy, titanium alloy and stainless steel, there have been extensive experimental studies which and stainless steel, there have been extensive experimental studies which investigated the influence of investigated the influence of parameter such laser spot shape and its intensity on the shock effect [9].
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