# Mat Sci Ch 8

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1. What are the 2 types of fracture possible for metals?
• 1) Ductile
• 2) Brittle
2. The two steps involved in fracture process:
• 1) crack initiation
• 2) crack propagation
3. The crack propagatoin for a __(1)__ fracture is slow and stable while it is sudden and rapid for __(2)__ fracture.
• 1) Ductile
• 2) Brittle
4. Why is Ductile fracture almost preferred more than Brittle fracture?
• 1) Brittle fracture occurs suddenly & satastrophically
• 2) Ductile fracture gives warning
5. Brittle fracture can be catagorized into two types:
• 1) Triangranular (through grains)
• 2) Intergranular (along grain boundaries)
6. A measure of a material's resistance to brittle fracture when a crack is present.
Fracture toughness
7. What are the two types of impact testing techniques for fracture toughness?
• 1) Charpy v-notch (CVN)
• 2) Izod
8. Decreasing the grain size of low strength steels does what two things to the metal?
What is the opposite method?
• 1) decreases the strength
• 2) lowers the DBT temperature, hence toughens it.
• - Increase Carbon content
9. A form of failure that occurs in structures subjected to fluctuating stress.
Fatigue
10. Three types of Cyclic stresses:
• 1) Axial (tension-compression)
• 2) Flexural (bending)
• 3) Torsional (twisting)
11. Three different fluctuation stress-time modes:
• 1) Reversed stress cycle
• 2) Repeated stress cycle
• 3) Vary randomly in amplitude and frequency
12. The stress level at which failure will occur for some specific number or cycles.
Fatigue strength
13. The number of cycles to cause failure at a specified stress level.
Fatigue life
14. The three steps by which failure is characturized by:
• 1) crack initiation
• 2) crack propagation
• 3) Final failure
15. Failure that occurs by simultaneous action of cyclic stress and chemical attack.
Corrosion fatigue
16. Deformation under constant static load (or stress) at elevated temperature are termed as what?
Creep
 Author: Dusyat ID: 112492 Card Set: Mat Sci Ch 8 Updated: 2011-10-27 03:33:44 Tags: Material Science Chapter Folders: Description: Material Science Chapter 8 Show Answers: