Mechanics of Materials
9th Edition
ISBN: 9780133254426
Author: Russell C. Hibbeler
Publisher: Prentice Hall
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Textbook Question
Chapter 12.9, Problem 12.128P
Each of the two members is made from 6061-T6 aluminum and has a square cross section 1 in. × 1 in. They are pin connected at their ends and a jack is placed between them and opened until the force it exerts on each member is 50 lb. Determine the greatest force P that can be applied to the center of the top member without causing either of the two members to yield. For the analysis neglect the axial force in each member. Assume the jack is rigid.
Prob. 12–128
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A.The bar of negligible weight is supported by two springs, each having a stiffness k = 98 N/m. If the springs are originally unstretched, and the force is vertical as shown, determine the angle the bar makes with the horizontal, when the 31-N force is applied to the bar.
B.Determine the stiffness k of each spring so that the 32-N force causes the bar to tip = 13.6° when the force is applied. Originally the bar is horizontal and the springs are unstretched. Neglect the weight of the bar.
مقاومة المواد
The rigid bar of negligible weight is supported as shown. The middle helical spring is made of 22 mm diameter steel spring and has an outside diameter of 100 mm with 10 turns and the two side springs are made of 32 mm steel spring and has an outside diameter of 250 mm with 8 turns. Before the load P is applied, the side springs are 25 mm longer than the middle spring. If the applied load P = 15 kN and the rigid bar remains horizontal, determine the stress in each spring. Use G = 83 GPa for steel and G = 42 GPa for bronze.
Chapter 12 Solutions
Mechanics of Materials
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