Residual stresses due to foreign object damage in laser-shock peened aerofoils: Simulation and measurement
Residual stresses due to foreign object damage in laser-shock peened aerofoils: Simulation and measurement
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DOI：
10.1016/j.mechmat.2014.12.001
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发表时间：
2015-03-01
影响因子：
3.9
通讯作者：
Withers, P. J.
中科院分区：
文献类型：
--
作者：
Lin, B.;Zabeen, S.;Withers, P. J.
翼型前缘的外物损伤是航空发动机压气机叶片寿命的主要限制因素之一。激光冲击强化（LSP）已被提出作为一种手段，增加材料的抵抗这种冲击损伤。在这项工作中，一个三维有限元（FE）模型已被开发来模拟由于头上（0度）和45度的冲击由一个长方体的弹丸上的翼型试样与LSP处理的残余应力。采用Johnson-Cook（JC）材料模型描述应变率相关的材料行为;同时在45度FOD模拟中考虑Johnson-Cook动态失效模型，其中发生了显著的材料损失。在选定的高应变率的模型的应变率敏感性进行了评估，从文献中的数据。从正面碰撞的模拟的数值结果进行了比较，通过深度分辨同步辐射X射线衍射的中平面上的测量。然后使用该模型来预测由于0度和45度FOD冲击引起的3D残余应力分布，并将结果与从高能同步辐射X射线衍射获得的应变图进行比较。已发现模拟和测量之间的良好至极好的相关性。（C）2014 Elsevier Ltd.保留所有权利。
Foreign object damage (FOD) to the leading edge of aerofoils has been identified as one of the main life-limiting factors for aeroengine compressor blades. Laser-shock peening (LSP) has been proposed as a means of increasing the material's resistance to such impact damage. In this work, a three-dimensional finite element (FE) model has been developed to simulate the residual stresses due to head on (0 degrees) and 45 degrees impacts by a cuboidal projectile on aerofoil specimens treated with LSP. The Johnson-Cook (JC) material model was employed to describe the strain rate-dependent material behaviour; whilst the Johnson-Cook dynamic failure model was considered in 45 degrees FOD simulation, where significant loss of material occurred. The strain rate sensitivity of the model at selected high strain rates was assessed against the data from the literature. The numerical results from the simulation of head-on impact were compared with the measurements by depth-resolved synchrotron X-ray diffraction on the mid-plane. The models were then used to predict the 3D residual stress distributions due to 0 degrees and 45 degrees FOD impacts, and the results were compared with the strain maps obtained from high-energy synchrotron X-ray diffraction. Good to excellent correlations between the simulations and the measurements have been found. (C) 2014 Elsevier Ltd. All rights reserved.