针对人工关节因无菌性松动导致使用寿命受限的瓶颈问题，基于激光冲击微造型工艺，研究人工关节表面改形改性机理及微坑阵列对人工关节生物摩擦学性能的改善机制，实现抑制无菌性松动的目标。开展人工关节表面激光冲击微坑实验与仿真分析，研究激光高应变率动态冲击作用下材料应力应变状态的演变机制，阐明人工关节表面激光冲击微坑成形机理；探索在高应变率效应与等离子体屏蔽效应综合作用下，激光冲击工艺参数对人工关节材料表层几何与物理性能的影响规律；通过摩擦磨损实验分析与评价，揭示微坑阵列提高人工关节摩擦学性能进而抑制无菌性松动的内在机理；建立材料表层几何和物理性能与人工关节摩擦学性能间的映射关系，结合激光冲击微造型工艺规律，形成人工关节表面激光冲击微造型工艺规划方法。本项目的研究将丰富激光冲击微坑阵列的减摩抗磨理论，有望满足延长人工关节服役寿命的迫切需求，对于拓展激光冲击微造型技术的应用领域具有重要的理论和实用价值。

In order to solve the bottleneck problem about limited life span of joint prosthesis due to aseptic loosening, the mechanism of laser peen texturing (LPT) and the improvement on tribological performance of joint prosthesis will be investigated. Firstly, by conducting experimental and numerical investigation on the micro-dimple fabrication using LPT, the stress-strain relationship under the high strain rate effect of laser shock process and the mechanism of micro-dimple fabrication on joint prosthesis will be studied. Then, the influence of LPT process parameters on geometrical and physical property of joint prosthesis will be analyzed, with the consideration of comprehensive influences of high strain rate effect and plasma shielding effect. Followed, by analyzing and evaluating the results of friction and wear tests, the aseptic loosening inhibition mechanism of LPT will be revealed. Finally, the relationship between geometrical and physical property and the tribological performance of joint prosthesis will be established. Through the combination with the effect of LPT process parameters on geometrical and physical property of joint prosthesis, the process planning method of LPT aiming at inhibiting aseptic loosening of joint prosthesis will be proposed. The research will not only enrich the theory of friction and wear reduction using micro-dimple array, but also meet the urgent demand for prolonging the life span of joint prosthesis. It is also meaningful for expanding the application of LPT theoretically and practically.