For a compression-shear mixed mode interface crack, it is difficult to solve the stress and strain fields considering the material viscosity, the crack-tip singularity, the frictional effect, and the mixed loading lev...For a compression-shear mixed mode interface crack, it is difficult to solve the stress and strain fields considering the material viscosity, the crack-tip singularity, the frictional effect, and the mixed loading level. In this paper, a mechanical model of the dynamic propagation interface crack for the compression-shear mixed mode is proposed using an elastic-viscoplastic constitutive model. The governing equations of propagation crack interface at the crack-tip are given. The numerical analysis is performed for the interface crack of the compression-shear mixed mode by introducing a displacement function and some boundary conditions. The distributed regularities of stress field of the interface crack-tip are discussed with several special parameters. The final results show that the viscosity effect and the frictional contact effect on the crack surface and the mixed-load parameter are important factors in studying the mixed mode interface crack- tip fields. These fields are controlled by the viscosity coefficient, the Mach number, and the singularity exponent.展开更多
文章对异车型混合集送的辆路径问题(Vehicle Routing Problem with heterogeneous fleet,backhaul and mixed-load,VRPHBM)进行研究,提出了一种基于多属性标签的蚁群系统算法(Multi-Label based Ant Colony System简称MLACS)。该算法利...文章对异车型混合集送的辆路径问题(Vehicle Routing Problem with heterogeneous fleet,backhaul and mixed-load,VRPHBM)进行研究,提出了一种基于多属性标签的蚁群系统算法(Multi-Label based Ant Colony System简称MLACS)。该算法利用面向对象理念,分别对客户、车辆及其行驶路径构建多属性标签,再通过蚁群算法的搜索规则对客户和车辆标签进行匹配,从而得出满意的车辆行驶路径。通过Solomon标准及其扩展算例和实际案例的验证表明,MLACS具有快速、灵活和稳定等特点,能够很好地解决VRPTW、VRPHBM以及多限制条件的实际应用问题。与本文列出的研究同类型问题文献的其他几种算法相比,MLACS算法在运算时间以及计算结果上明显具有优势,是求解该类问题的有效算法。展开更多
基金Project supported by the National Natural Science Foundation of China(No.11302054)the Fundamental Research Funds for the Central Universities(No.HEUCF130216)
文摘For a compression-shear mixed mode interface crack, it is difficult to solve the stress and strain fields considering the material viscosity, the crack-tip singularity, the frictional effect, and the mixed loading level. In this paper, a mechanical model of the dynamic propagation interface crack for the compression-shear mixed mode is proposed using an elastic-viscoplastic constitutive model. The governing equations of propagation crack interface at the crack-tip are given. The numerical analysis is performed for the interface crack of the compression-shear mixed mode by introducing a displacement function and some boundary conditions. The distributed regularities of stress field of the interface crack-tip are discussed with several special parameters. The final results show that the viscosity effect and the frictional contact effect on the crack surface and the mixed-load parameter are important factors in studying the mixed mode interface crack- tip fields. These fields are controlled by the viscosity coefficient, the Mach number, and the singularity exponent.
文摘文章对异车型混合集送的辆路径问题(Vehicle Routing Problem with heterogeneous fleet,backhaul and mixed-load,VRPHBM)进行研究,提出了一种基于多属性标签的蚁群系统算法(Multi-Label based Ant Colony System简称MLACS)。该算法利用面向对象理念,分别对客户、车辆及其行驶路径构建多属性标签,再通过蚁群算法的搜索规则对客户和车辆标签进行匹配,从而得出满意的车辆行驶路径。通过Solomon标准及其扩展算例和实际案例的验证表明,MLACS具有快速、灵活和稳定等特点,能够很好地解决VRPTW、VRPHBM以及多限制条件的实际应用问题。与本文列出的研究同类型问题文献的其他几种算法相比,MLACS算法在运算时间以及计算结果上明显具有优势,是求解该类问题的有效算法。
基金国家863高技术基金项目(2015AA050607)国家科技支撑计划资助项目(2014BAA04B02)+1 种基金The National High Technology Research and Development of China 863 Program(2015AA050607)Project Supported by National Science and Technology Support Program(2014BAA04B02)
