工程力学最后章节习题(国外英文资料).doc

工程力学最后章节习题(国外英文资料) 268, (B). The order of principal stress is sigma 1 sigma 2 sigma 3. () 269, (A). The stress method can be applied to analyze the state of plane stress. () 270, (B). The maximum shear stress value of the three stress states is half the maximum and minimum principal stress. (a) 271, (B). Low carbon steel along the axis of 45? The phenomenon of angular destruction is explained by the first strength theory. () 272, (A). The third and fourth strength theories are widely used in mechanical manufacturing. (a) 273, (B). The pure shear unit is a unidirectional stress state. () 274, (B). The elements of a pure bending beam are two states of stress. () 275, (A). The maximum shear stress is equal to the stress state of the unit. () 276, (B). A point where the positive stress in one direction is zero, and the line strain in that direction is zero. () 277, (A). Due to the length of the elements in an infinitesimal, the stress state of each side of the unit cell, can accurate said that stress condition, known as the point of stress state. () 278, (A). The water in the water pipe is frozen in the cold winter environment, and all of them are in three stress states. () 279, (A). In six sides of the elements, there are only four relative to the side of the stress, the rest of the two sides is no stress, the stress of each side and 4 action line and the two free parallel to the side, the stress state is called the state of plane stress. () 280, (A). Summarizing the relationship between the stress circle and the unit body can be summarized by double the Angle and the same turn. () 281, (A). The Angle of the Angle between two points of the stress circle is the same as the Angle between the two points in the unit. () 282, (A). The low carbon steel round shaft specimen is related to the maximum shear stress when it twists and bends. () 283, (A). In the case of torsion failure, the screw of the grey cast iron reel is broken by the spiral surface of the axial Angle, whi