Explain the concept of yield strength and its importance in material testing.
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Explain the concept of yield strength and its importance in material testing.
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- 2. A steel bar, whose cross section is 0.55 inch by 4.05 inches, was tested in tension. An axial load of P = 30,500 lb. produced a deformation of 0.105 inch over a gauge length of 2.05 inches and a decrease of 0.0075 inch in the 0.55-inch thickness of the bar. Determine the lateral strain. * Your answer Determine the axial strain. Your answer Determine the Poisson's ratio v. * Your answer Determine the decrease in the 4.05-in. cross-sectional dimension (in inches). * Your answerDiscuss the principles of stress and deformation analysis for several kinds of stressesDiscuss the concept of strain hardening in materials?
- Determine stress valueA cylindrical specimen of stainless steel having a diameter of 12.8 mm (0.505 in.) and a gauge length of 50.800 mm (2.000 in.) is pulled in tension. Use the load–elongation characteristics shown in the following table to answer the following: a. Plot the data as engineering stress versus engineering strain. b. Compute the modulus of elasticity. 66 c. Determine the yield strength at a strain offset of 0.002. d. Determine the tensile strength of this alloy. e. What is the approximate ductility, in percent elongation? f. Compute the modulus of resilienceMechanical properties of materials • H.W.: • The following data where obtained during the tensile test of mild steel circular bar 12.75 mm diameter and 203.2 mm gauge length. Determine the following: 1) The apparent stress at each point 2) Strain at each point 3) True stress at each point (Assume D at failure is 8,51 mm and D at max. load is 11.15 mm) 4) Draw stress - strain curved based on: a) Original cross sectional area b) True cross sectional area 5) Proportional limit Mechanical properties of materials 6) Modulus of elasticity 7) Upper and lower yield point 8) Ultimate strength 9) Breaking strength based on the original cross sectional area and on true cross sectional area 10) Percentage of elongation 11) Percentage of reduction in cross sectional area. 12) Ductility, Resilience and toughness Load (N) 4393 16902 29357 33360 33627 35584 41366 48839 52709 55378 56356 43768 Deformation 0.0254 0.127 0.228 0.305 0.356 3.81 6.35 11.68 16.76 26.92 43768 42.42 (mm )
- 2. Shown below are pieces of unsaid material. They are combined and locked in each other and a force P is pulling each side. Assuming that the Shear stress for the material is 38 MPa, Determine the force P needed to fracture the materials in shear. 30 mm 30 mm 80 mm Section A-APROBLEM 1 A steel rod with a cross sectional area of 150 mm? is stretched between two fixed points. The tensile load at 20°C is 5000 N. a.) What will be the stress at -20°C? b.) At what temperature will the stress be zero? Assume a = 11 .7 µm/m°C, and E = 200 Gpa *Show geometry of deformation ©sidewarIn a tensile test, Load and Elongation are Normalized to Engineering Stress and Engineering Strain . Why?