资料力测验题及谜底(国外英文资料).docVIP

材料力考试题及答案(国外英文资料) He is a professor of light engineering Mechanics of materials A A class paper 2010-2011 First semester Page 1 Please follow the template editor and write the exam questions. Dont make the border out of the box. Department: (date) (month) (year) qid a The second three four five six seven Total score score One. (think of the correct square root. The size of the shaft is related to the cross-sectional area of the bar. (a) The moment of inertia of a plane, which can be positive or negative, can be equal to zero. (a) The deflection of a plane bending beam must be a plane curve that overlaps with the external force or parallel. (a) The maximum deflection of the beam must occur at the maximum bending moment of the beam. (a) The shear stress on the maximum positive surface of the unit is equal to zero. (a) Two. The choice (three points, 15 points) Stress concentration usually occurs in artifacts (). A, the section size suddenly changes place B, cross section force abrupt change place C, the area of the edge of the cross section is the most of the D, the section neutral axis The main beam of a bridge crane is designed to be the advantage of the extension beam of both sides of the bridge. The reason is (). A, the maximum deflection value of the beam is reduced, and the maximum bending moment value of the beam is increased C, the maximum bending moment value of the beam was reduced, and the bending stiffness of the beam was increased To carry the same section of the shaft, as well as the shaft. A, no shear stress B, no positive stress The C, the longitudinal section is unstressed D, no transverse strain In order to improve the intensity of the revolving ring, the () method is adopted. A, increase the cross-sectional area of the circle B, reduce its rotation speed C, increase the average radius of the ring and reduce the average radius of the ring The fatigue limit of the component is () under the alternating stress of symmetrical cycle. A, B, C, D, Three. Fi