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- - 7.2-26 The strains on the surface of an experiment al device made of pure aluminum (E = 70 GPa. v = 0.33) and tested in a space shuttle were measured by means of strain gages. The gages were oriented as shown in the figure. and the measured strains were = 1100 X 106, h = 1496 X 10.6, and = 39.44 X l0_. What is the stress o in the x direction?A rigid steel bar is supported by three rods, as shown. There is no strain in the rods before the load P is applied. After load P is applied, the normal strain in rod (2) is 1020 μin./in. Assume initial rod lengths of L1 = 148 in. and L2 = 78 in. Determine(a) the normal strain in rods (1).(b) the normal strain in rods (1) if there is a 0.043 in. gap in the connections between the rigid bar and rods (1) at joints A and C before the load is applied.(c) the normal strain in rods (1) if there is a 0.043 in. gap in the connection between the rigid bar and rod (2) at joint B before the load is applied.2.Show that volumetric strain in a bar is equal to the sum of strains in three mutually perpendicular directions. 3. Explain the terms: (i) Modulus of elasticity (ii) Modulus of rigidity and (ii) Bulk modulus. 4. Derive the relationship between (i) Modulus of elasticity and modulus of rigidity (ii) Modulus of elasticity and bulk modulus
- A 200 meter cable is suspended vertically. At any point along the cable, the strain is proportional to the length of the cable below the point. If the strain at the top of the cable is 0.001, determine the total elongation of the cable.5 decimal places Determine the total strain (mm/mm) of a 2.64-m bar with a diameter of 21 mm subjected to a tensile force of 71 kN at a temperature increase of 49 C°. Consider the α=27.3 µm/mC° and E = 122 GPa.The force P causes point A to be displaced vertically by 1.60 mm A) Determine the normal strain developed in wire AB B) Determine the normal strain in wire AC
- A tri-axial state of stress, σx , σy, and σz ,exists in a steel machine part. For steel, E = 200GPa and ν = 0.3. Determine the normal strain in the x-direction if σx = 100MPa, σy = 35MPa, σz = 70MPa. Determine the dilatation. Determine the modulus of rigidity.If the in-plane principal strains are of opposite signs, then theabsolute maximum shear strain equals the maximum in-plane. True or false?Prove that the sum of the normal strains in perpendicular directions is constant, i.e., Px + Py = Px′ + Py′
- What happens if the in-plane principal strains are of opposite signs? then theabsolute maximum shear strain equals the maximum in-plane. True or false?a) A thin strip of rubber-like material has an unstretched length of 345 mm.i. If it is stretched around a pipe having an outer diameter of 112 mm, determine the average normal strain in the strip, assuming linear elastic behaviour. (3 marks)ii. A steel wire of diameter dwire = 1.5 mm also has an initial length of 345 mm. The Young’s Modulus of the steel material is 190 GPa and its yield strength is 275 MPa. What is the maximum pipe diameter that the wire can be stretched around without yielding and what is the magnitude of the tensile force in the wire for this elongation? Give your answers to two decimal placesA steel rod is subjected to a gradually applied load (F) which gave a rise to a maximum stress of 200 MPa. The rod is 250 mm long and one part of its length is square and the remainder is circular with a diameter of 25 mm. If the total strain energy in the rod and modulus elasticity of the material is 1.3 J and 200 GPa, determine the following:1.The applied load F2.The total extension of the bar3.The length of the square portion of the bar4.The suddenly applied load that will induce the same amount of energy 5.The load that falls from a height of 8 mm induces 1,3 J in the bar.