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1、The Introduction of Mechanics of Materials,陈继乐,The research object of Mechanics of Materials The task of Mechanics of Materials and its relation with engineering The properties and the fundmental assumptions of the solid deformable bodies Basic types of the deformation of rods,1.The research object
2、of Mechanics of Materials,Structure members Classification of structure members: plate or shell clump body bar or rod,2.The task of Mechanics of Materials and its relation with engineering,Strength , Rigidity, Stability Strength: Capacity to resist failure of a component or an element. Rigidity: Cap
3、acity to resist deformations of a component or an element. Stability: Capacity to remain the original state in equilibrium of a component or an element.,The tasks of mechanics of materials,Under the request that the strength, rigidity, stability are satisfied, offer the necessary theoretical foundat
4、ion and calculation method for determining reasonable shapes and dimensions, choosing proper materials for the components at the most economic price.,3.The properties and the fundmental assumptions of the solid deformable bodies,1.Continuity:The material of a solid deformable body is continuously di
5、stributed over its volume so that there are not any cracks, defects or holes etc . 2.Homogeneity:The material of the solid deformable body is homogeneously distributed over its volume. 3.Isotropy:The mechanical properties are the same in all directions at a point.,4.Small deformations: The deformati
6、ons for a solid deformable caused by external forces are very small compared with the dimensions of the body. Thus when we study the equilibrium and motion of the solid deformable body, the deformation of the body may be neglected.,4.Basic types of the deformation of rods,1.Axial tension 2.Shear,3.Torsion 4.Bending,Thank You!,