Engineering Against Fracture
Engineering Against Fracture
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抗断裂工程
DOI：
10.1007/978-1-4020-9402-6_31
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Evans A
中科院分区：
文献类型：
--
作者：
Evans A
通过机械表面处理，可以显著改善工程合金的疲劳性能。这些过程通过不均匀塑性变形产生显著的近表面残余压应力。在机械表面处理的情况下，如激光冲击强化、某些抛光和轧制技术以及超声波冲击处理（UIT），压缩残余应力层可以延伸到毫米的深度，平衡拉伸应力位于更深的位置。表征这种机械表面处理产生的残余应力的非破坏性技术主要限于使用穿透中子和同步加速器x射线辐射的衍射方法。这些辐射源的应用是通过在激光冲击强化（LSP）处理的两种类型的试样中残余应变分布的特征来说明的。衍射峰展宽的分析提供了有关处理的塑性变形扩展深度的定性信息。通过对钛合金和铝合金激光冲击强化的两个实例研究，证明了中子和同步加速器衍射技术在表面工程材料无损残余应力表征领域的能力。
The fatigue behaviour of engineering alloys can be significantly improved through the application of mechanical surface treatments. These processes generate significant compressive residual stresses near surface by inhomogeneous plastic deformation. In the case of mechanical surface treatments such as laser shock peening, certain burnishing and rolling techniques and ultrasonic impact treatment (UIT), the compressive residual stress layer can extend to a depth of the order of millimeters, with balancing tensile stresses located deeper. Techniques to characterise the residual stresses generated by such mechanical surface treatments non-destructively are mainly limited to diffraction methods using penetrating neutron and synchrotron X-ray radiations. The application of these radiation sources is illustrated here by the characterisation of residual strain distributions in a two types of specimens treated with laser shock peening (LSP). Analyses of diffraction peak broadening provide qualitative information concerning the depth to which the plastic deformation of the treatments extends. Two case studies of laser shock peening of titanium and aluminium alloys is presented to demonstrate the capabilities of neutron and synchrotron diffraction techniques in the field of residual stress characterisation of surface engineered material non-destructively.