MECH 210L- Materials Science and Engineering Laboratory
Midterm
材料科学代写 I. Answer the following question. (22 points) 1.Necking of ductile steel starts at what point on the tensile stress-strain curve?
I. Answer the following question. (22 points) 材料科学代写
- Necking of ductile steel starts at what point on the tensile stress-strain curve?
- What is work hardening of metals?
- What is true stress?
- At the start of tensile test of steels, a 50-lb preload is applied and the zeroed out. What is the purpose?
- What is the physical meaning of modulus of resilience of a metal?
- What material property is implied in the value of work hardening exponent?
- What is stress concentration? What causes it?
II. 材料科学代写
Using the hardness-%CW diagram shown, determine the amount of cold work needed to improve the tensile strength of a brass rod by 40%. The original tensile strength of the brass rod is 283 MPa. (23 points)
III.
A steel rod 15 mm in diameter is cold drawn to 12 mm in diameter. What is the amount of cold work? (10 points)
IV. 材料科学代写
What is the tensile strength of a mild steel having hardness of 45 HRC? Show your approach. (10 points)
V.
What are the true stress and true strain for point P on the engineering stress-strain curve? Show your calculation. (10 points)
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