材料力学试卷三.doc

文档介绍：Henan University of Technology Mechanics of Material Exam Papers
Major、Class and Grade: the Schoolteacher:
the Director in the staff room(Signature) Papers’ Code A/B
Students’ major: Grade: Class: Name: NO. :
Note:(1)Don’t write your class and name under the hermetic line.(2)Solve the questions under the hermetic line.
………………………………………the Hermetic Line ………………………………………………………
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1、A round steel rod must carry a tensile load of .If the allowable stress in the bar is , what is the minimum required diameter of the bar ? (5 points)
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Appraiser
2、A prismatic bar in tension ( see ) has cross sectional area and carries a load . Determine the normal and shear stresses on the inclined section (). (9 points)
Henan University of Technology Mechanics of Material Exam Papers
Students’ major: Grade: Class: Name: NO. :
Note:(1)Don’t write your class and name under the hermetic line.(2)Solve the questions under the hermetic line.
………………………………………the Hermetic Line ………………………………………………………

Score
Appraiser
3、Find the stresses for the element shown in if (12 points)
Score
Appraiser
4、A bar in torsion has diameter over one-half its length and diameter over the other half (see ) . What is the allowable torque T if the angle of twist is not to exceed radian