When a material is unloaded and returned to its original shape, it exhibits plastic behavior. True False
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- Compare the engineering and true secant elastic moduli for the natural rubber in Example Problem 6.2 at an engineering strain of 6.0. Assume that the deformation is all elastic.The material returns to its original shape when the load is removed. (A Elastic Limit B Elastic Behavior Limit c) Maximum Limit D D Proportional LimitIn the plastic range of a material, if the load is removed the material will: a. reach failure and break O b. continue up to elastic limit O C. go back to its original shape o d. remain in its current shape
- Mechanics of Deformable Bodies The rigid bar of negligible weight is pinned at O and attached to two vertical rods. Assuming that the rods were initially stress-free, what is the largest load P that can be applied without exceeding stresses of 150 MPa in the steel rod and 70 MPa in the bronze rod? 21 -1.5 →1.5 Bronze Steel A = 900 mm2 E= 200 GPa L= 1.5 m A = 300 mm? E = 83 GPa L=2 mProblem 1 An aluminum rod is rigidly attached between a steel rod and a bronze rod as shown. Axial loads are applied at the positions indicated. Aluminum Steel A=800mm2 A=1000mm2 Bronze A=700mm? 4P 2P 500mm 600mm 700mm 1. What is the maximum value of P that will not exceed the axial stress bronze of 105 MPa? 2. What is the maximum value of P that will not exceed the axial stress in aluminum of 90 MPa? 3. If P=10KN, what is the axial force to be carried by the aluminum in KN? 4. If P is 5KN, what is the axial stress of steel?Materials can have different masses but equal volumes. a. TRUE b. FALSE
- A tensile force of 5 kN produce an elastic reduction in diameter of 4 x 10-4 mm on a metal alloy specimen that has a diameter of 6 mm. Determine: The modulus of elasticity of the alloy (Unit: GPa) . The Poisson' s ratio of this alloyMaterial A is known as a high strength material and Material B has high toughness. Explain the difference between properties of Materials A and B.In the elastic range of a material, if the load is removed the material will. a. Remain in its current shape O b. Continue up to elastic limit O c. Go back to its original shape o d. Reach failure and break
- a) Which of the two materials has the greater hardness? b) Which of the two materials is more resilient? c) Indicate on the curves the yield strength and yield strength of each material.If the final lenght of materials is 10.1mm and its ductility is measured as 1 % in terms of elongation .what is its initial lenghtA cylindrical specimen of a hypothetical metal alloy is stressed in compression. If its original andfinaldiameters are 20.000 and 20.026mm, respectively, and its final length is 74.96 mm, compute its originallength if the deformation is totally elastic. The elastic and shear moduli for this alloy are 105 GPa and 39.7 GPa,respectively.