12) A high strength steel component has a MPa-m that can be tolerated if t Yield
ID: 1866289 • Letter: 1
Question
12) A high strength steel component has a MPa-m that can be tolerated if t Yield critical stress intensity (worst case, Kic equal to 28.2 trength is 1,000 MPa. Calculate the largest size of a surface crack (in mm) t an extermal tensile stress of 900 MPa is applied. Assume 1-1 a) 0.44 mm b) 3.12 mm c) 0.88 mm d) 0.31 mm e) 4.44 mm 13) Polymeric materials usually tend to have: a) Much greater tensile strength than that of metallic alloys values comparable to those of metallic alloys b) Elastic modulus c) Predominantly ionic bonding within chains d) Covalent bonding within chains e) High electric conductivity 14) The yield strength of metallic alloys in common engineering service is typically a) very close to the ultimate tensile strength b) 3 10 psi c) 100 psi to 1,000 psi d)-1/2 of the elastic modulus e) 10,000 psi to 100,000 psi °C or T2-200 °C. The metal is solid and is in the same crystalline system at both temperatures. Which of the following statements is incorreet? 15) Consider a piece of metal that has been allowed to stabilize for a long time at either T1-20 a) The concentration of vacancies is greater at T2 than at T1 b) Edge dislocations slip when the shear stress exceeds a limit value that may be different at T1 than at T2. If T2 is near the melting temperature the concentration of vacancies at T2 is roughly in the order of 1/1000 c) d) Grain boundaries may exist at both temperatures. e) At both temperatures interstitial impurity atoms are usually larger than the atoms in the host crystal.Explanation / Answer
13. D covalent bonding within chains
14. Very close to ultimate tensile strength
15 c
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