creep quiz - 1 What is creep Is the term used to desribe the tendency of a material to move or to deform permanently under a constant load over a period

creep quiz - 1 What is creep Is the term used to desribe...

This preview shows page 1 out of 1 page.

1. What is creep? 2. Mention at least 3 factors which affect rate of creep Material properties Exposure time Exposure temperature Applied load 3. Identify 4 stages of creep on the graph, HOw does the deformation occur at each stage Instaneous Deformation, mainly elastic Primary creep, starts rapidly and slows with time Secondary creep, uniform rate Tertiary creep, has accererating creep rate and terminates at material failure 4. Mention 3 types of creep testing. Draw simple loading diagram for each Tensile creep- Compressive creep Flexural creep 5. What is creep strength Is the highest stress that a material can withstand for a specified length of time without exceeding
Image of page 1

Unformatted text preview: the specified deformation at given temp. 6. what are 3 ways to engineer so creep is more difficult to occur? High melting point coarse grained structures High oxidation resistance 7. What are 3 mechanisms of creep? Stress assisted vacancy diffusion Grain boundray diffusion Grain boundary sliding Dislocation motion The temp range for which creep is prime importance is .4TM, where, TM is the melting point T Plastics are more vulnerable to creep because they are covalently bonded F Metals are more vunerable to creep then ceramics T A windmill blade will be high affected by creep F If the load is .4 of the yield strength then creep will be the primary concern F...
View Full Document

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes