Assignment 1 - Stress Strain

University of Management and Technology Sialkot Campus S c h o ol o f Me c han i c al En g i n e e ri n g

Machine Design & CAD- I Assignment-1 (CLO-1) Concepts of Stress & Strain Course Code : ME-223 Program : BSME (Batch-5) Resource Person : Muhammad Yasir Khalid

Total Marks Date Due Date

: 10 Marks : Mar 20, 2020 : Mar 28, 2020

1. A reciprocating steam engine connecting rod is subjected to a maximum load of 65 kN. Find the diameter of the connecting rod at its thinnest part, if the permissible tensile stress is 35 N/mm2. 2. The maximum tension in the lower link of a Porter governor is 580 N and the maximum stress in the link is 30 N/mm2. If the link is of circular cross-section, determine its diameter. 3. A wrought iron rod is under a compressive load of 350 kN. If the permissible stress for the material is 52.5 N/mm2, calculate the diameter of the rod. 4. The diameter of a piston of the steam engine is 300 mm and the maximum steam pressure is 0.7 N/mm2. If the maximum permissible compressive stress for the piston rod material is 40 N/mm2, find the size of the piston rod. 5. Two circular rods of 50 mm diameter are connected by a knuckle joint, as shown in Fig, by a pin of 40 mm in diameter. If a pull of 120 kN acts at each end, find the tensile stress in the rod and shear stress in the pin.

6. A steel shaft 50 mm diameter and 500 mm long is subjected to a twisting moment of 1100 N-m, the total angle of twist being 0.6°. Find the maximum shearing stress developed in the shaft and modulus of rigidity. 7. A spindle as shown in Fig, is a part of an industrial brake and is loaded as shown. Each load P is equal to 4 kN and is applied at the mid-point of its bearing. Find the diameter of the spindle, if the maximum bending stress is 120 MPa.

8. A shaft is supported in bearings, the distance between their centers being 1 meter. It carries a pulley in the center and it weighs 1 kN. Find the diameter of the shaft, if the permissible bending stress for the shaft material is 40 MPa.

*Note: Draw schematic diagrams for all the problems.