资料力学温习资料3(国外英文资料).docVIP

材料力学复习资料3(国外英文资料) Material mechanics related problem solving What are the three elastic constants of the material? What do they have to do with it? The three elastic constants of the material are the elastic modulus E, the shear elastic modulus G and the poisson ratio mu, and their relation is G = E / 2 (1 + mu). What is deflection and Angle? Deflection: the cross section is perpendicular to the line in the direction of the beam axis. Angle of rotation: the angular displacement of the rotation of the sexual axis in the cross section. What are the two types of strength theory? What kind of strength theory is the maximum theory of shear force? Ⅰ. Study the first strength theory of brittle fracture mechanics factors, including the maximum tensile stress theory and maximum elongation line strain theory; Ⅱ. The strength of the second type of plastic yield mechanical factor theory, including the theory of maximum shear stress and the shape change energy density theory. What should be the conditions for the displacement of the beam by the superposition method? Using the superposition method to calculate the displacement of the beam, the constraint is that the deformation under load is small, and the material is within the elastic range of the material. With these two conditions, the displacement of the beam is linearly dependent on the load, so the displacement of each load on the beam will not be affected by the other load. Listing measures to reduce the flexibility of pressure rods? (1) strengthening rod end constraint (2) reduce the compressive bar length, such as additional support in the middle (3) choose reasonable section shape, in the cross section area of a certain, as far as possible using the moment of inertia big cross section. Enumerating the results of the crushing destruction under graphical conditions? One is that the round hole of the steel plate is partially plastic and the hole is stretched. The other is a rivet that produces partial deformation, and th