Question

Q3: Tension test was conducted on a mild steel rod having diameter 1.5 cm and length 20 cm. While applying a load of 10 kN, there will be an extension of 0.012 cm on a length of 20 cm. Maximum load carried by the rod was found to be 26 kN and the load beyond which stress is not proportional to strain was observed to be 11 kN. When the specimen breaks, the extension of the rod for 20 cm length was found to be 6.15 cm and the diameter at the fracture was 0.57 cm. Based on the test results determine the values for the stress corresponding to the limit of proportionality, modulus of elasticity, percentage elongation and percentage contraction of area at the fracture? Instead of mild steel when a brass rod having same diameter is tested within the elastic limit, extension of the rod was found to be 30% more than that of steel rod for a length of 20 cm. What will be the changes in the values for percentage increase in stress and strain? Given Modulus of elasticity of brass is equal to 0.9 times modulus of elasticity of steel. Suggest the methods to modify the stress strain behavior of both materials based on the findings.

Answer 1

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