A brittle material has the properties Sut = 30 kpsi and Suc = 90 kpsi. Using the brittle Coulomb- Mohr and modified- Mohr theories, determine the factors of safety for the following states of plane stress: a. x = 20 kpsi, Txy = −10 kpsi b. σx = - 15 kpsi, σy = 10 kpsi, Txy = -15 kpsi
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- The rails of a railroad track are welded together at their ends (to form continuous rails and thus eliminate the clacking sound of the wheels) when the temperature is 60°F. What compressive stress ?? =6.5×10-6 /? is produced in the rails when they are heated by the sun to 120"F if the coefficient of thermal expansion a = the modulus of elasticity E = 30 × 106 psi?A wine of length L = 4 ft and diameter d = 0.125 in. is stretched by tensile forces P = 600 lb. The wire is made of a copper alloy having a stress-strain relationship that may be described mathematically by =18,0001+30000.03(=ksi) in which is nondimensional and has units of kips per square inch (ksi). (a) Construct a stress-strain diagram for the material. (bj Determine the elongation, of the wire due to the Forces P. (c) IF the forces are removed, what is the permanent set of the bar? (d) If the forces are applied again, what is the proportional limit?Determine the strain energy per unit volume (units of psi) and the strain energy per unit weight (units of in ) that can be stored in each or the materials listed in the accompanying table, assuming that the material is stressed to the proportional limit. DATA FOR PROBLEM 2.7-5 Material Weight Density (lb/in3) Modulus of Elasticity (ksi) Proportional Limit (psi) Mild sleel 0.284 30,000 36,000 Tool steel 0.284 30,000 75,000 Aluminum 0.0984 10,500 60,000 Rubber (soft) 0.0405 0.300 300
- (a) Solve part (a) of the preceding problem if the pressure is 8.5 psi, the diameter is 10 in., the wall thickness is 0,05 in., the modulus of elasticity is 200 psi, and Poisson's ratio is 0.48. (b) If the strain must be limited to 1.01, find the maximum acceptable inflation pressureA brittle material has the properties Sut = 30kpsi and Sue = 90kpsi. Determine the factor of safety for the following states of stresses using; Brittle Coulomb Mohr Theory Modified Mohr 1 Theory (a) ox = 20kpsi,Oy = (b) o = 15kpsi,o, = -25kpsi (c) ox = 10kpsi,0y = -40kpsi (d) o, = -20kpsi,o, = -20kpsi, txy = -40 10kpsi, ty = -15kpsi (1) Draw the stress element (11) Plot the failure diagram in the o-plane (III) Estimate the factor of safetyA brittle material has the properties . Sut = 30 kpsi and Suc = 90 kpsi Using the brittle Coulomb-Mohr and modified-Mohr theories, determine the factor of safety for the following states of plane stress.
- Please help explain all, thank you!A bar of 4340 steel has an Sy = 50 ksi. Which of these statements is true: If Sy = 50 ksi, than the normal stress in the bar is always 50 ksi. If a normal stress of 40 ksi is applied to the bar, it will undergo plastic deformation. The Sy = 50 ksi indicates bar is behaving in a brittle manner. O Any normal stress above 50 ksi will cause plastic deformation in the bar.brittle material has the properties Sut = 30 kpsi and Suc= 90 kpsi. Using the brittle Coulomb- Mohr and modified-Mohr theories, determine the factor of safety for the following states of plane stress σx = 25kpsi , σy = 15kpsi.
- Required information Given a bar made of brittle material, properties of Sut= 30 kpsi and Suc = 90 kpsi and with stresses of Ox= -15 kpsi, Oy= 10 kpsi, and Txy=-15 kpsi. For the given state of plane stress, determine the factor of safety using the Coulomb-Mohr theory. The factor of safety isThe body of a DaVinci hospital robot made of steel materialThe material was statically loaded. Yield strength of the material 450MPa and the stress values given below occurred. Von Mises andCalculate the safety coefficients for both theories using the Tresca criteria.calculate σx= 80 MPa, σy= -40 MPa, τxy= 50 Mpa Note: Show the calculations in detailThe fluctuating stresses listed in the table are found at a critical location of a component made of steel with Se = 40 ksi, Sy = 80 ksi, Sut = 110 ksi and f= 0.87. These stresses are applied on the part within 10 s. What is the accumulative damage of this part? What is the life of the part in hours if this stress pattern continues to repeat for the remained of the part's life? Use Goodman criterion and Miner's rule in your solution. Loading order |Omin o max |Number of cycles -20 30 -10 50 1 3. -30 30 1