Stress-strain curves of two material specimens, A and B are shown below. 1. Indi
ID: 1719184 • Letter: S
Question
Stress-strain curves of two material specimens, A and B are shown below.
1. Indicate which material has higher Young’s Modulus, fracture toughness, yield strength, ultimate tensile strength, ductility, resilience, plastic strain (amount of permanent damage) at necking.
2. Which is more likely to be a metal? Which is more likely to be a ceramic?
3. If A and B were the same material with the same composition, what factors could alter their stress-strain behavior as seen above. List at least two factors.
Explanation / Answer
Ans: 1- Material A has higher young's modulus,yield strength,ultimate tensile strength,ductility,resilience,plastic strain has compared to material B.However since B has greater area under curve therefore the fracture toughness of material B will be high.
2.Material A is metal and B is ceramics.
3.The curve could be affected by a)residual stresses and b)Temperatue variation (either too low or high)