Mechanics of materials deals essentially with the stresses and displacements of structural element in the shape of a bar, straight or curved, which is subjected to tension compression, shear bending, or torsion 材料力学研究受到拉、压、剪、弯或扭的直杆 或曲杆的应力和位移。 弹性力学第一章
弹性力学第一章 11 • Mechanics of materials deals essentially with the stresses and displacements of structural element in the shape of a bar, straight or curved, which is subjected to tension, compression, shear, bending, or torsion. 材料力学研究受到拉、压、剪、弯或扭的直杆 或曲杆的应力和位移
Structural mechanics deals with the stresses and displacements of a structural in the form of a bar system, such as a truss or a rigid frame. 结构力学研究杆件系统(例:桁架或刚架)的应力 和位移 弹性力学第一章 12
弹性力学第一章 12 • Structural Mechanics deals with the stresses and displacements of a structural in the form of a bar system, such as a truss or a rigid frame. • 结构力学研究杆件系统（例：桁架或刚架）的应力 和位移
Elasticity deals with the stresses and displacements of the structural elements such as blocks, plates and shells. which are not in the form of a bar 弹性力学研究块体、板和壳体的应力和位移 Elasticity also analyze a bar element thoroughly and precisely. 弹性力学对杆件作更精确分析 弹性力学第一章 13
弹性力学第一章 13 • Elasticity deals with the stresses and displacements of the structural elements such as blocks, plates and shells, which are not in the form of a bar. • 弹性力学研究块体、板和壳体的应力和位移。 • Elasticity also analyze a bar element thoroughly and precisely. • 弹性力学对杆件作更精确分析
2 methods of analysis:研究方法 1) Similarity 相同点: equilibrium aspects静力学方面 geometrical aspects几何学方面 physical aspects物理学方面 弹性力学第一章
弹性力学第一章 14 2. methods of analysis:研究方法 (1) Similarity--- 相同点 : equilibrium aspects 静力学方面 geometrical aspects 几何学方面 physical aspects 物理学方面
equilibrium aspects -equilibrium of forces of an isolated bod 静力学方面-脱离体力的平衡 geometrical aspects --the relations between displacements and strains 几何学方面-位移和应变的关系 physical aspects the relations between stresses and strains 物理学方面-应力和应变的关系 弹性力学第一章 15
弹性力学第一章 15 •equilibrium aspects --equilibrium of forces of an isolated body 静力学方面--脱离体力的平衡 • geometrical aspects --the relations between displacements and strains. 几何学方面--位移和应变的关系 • physical aspects-- -- the relations between stresses and strains 物理学方面--应力和应变的关系