Mechanics of Materials
材料力学研究固体材料在外力作用下的应力、应变和变形规律，是机械工程的核心专业基础课。内容包括轴向拉压、剪切、扭转、弯曲四种基本变形的内力、应力和变形分析，应力状态与强度理论，组合变形，压杆稳定，动载荷与交变应力等。学生将掌握构件强度、刚度和稳定性计算方法，为机械零件设计提供理论依据。
Mechanics of Materials studies stress, strain, and deformation of solid materials under external loads. Topics include axial loading, shear, torsion, bending, stress states and failure theories, combined loading, column buckling, and dynamic and fatigue loading. Students master strength, stiffness, and stability calculations, providing the theoretical basis for machine component design.
给定一台齿轮减速器输出轴的结构与载荷参数，学生需完成轴的受力分析、弯矩图与扭矩图绘制，确定危险截面，按第三或第四强度理论进行强度校核，并计算轴的最大挠度与转角进行刚度校核。需提交完整计算书，含受力简图、内力图及强度刚度校核过程。
Given the geometry and loads of a gear reducer output shaft, students perform force analysis, plot bending-moment and torque diagrams, identify critical sections, conduct strength verification using the third or fourth strength theory, and check stiffness by computing deflection and slope. Submit a complete calculation report with diagrams and verification procedures.