ENGRI_HW6_2004 - (b The behavior of polymers is temperature...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
ENGRI 111 Homework # 6 Due Friday, December 3, 2004 1. Draw a stress/strain (engineering) curve for a typical metal and a typical ceramic. For the metal also draw the true stress/strain curve. 2. Answer a - d with true or false and explain your answer with a short sentence. (a) Grain boundaries are created when crystals of different orientations are joined together. (b) In a ceramic the tensile stress is 50 % greater than the yield strength. (c) Metals are not as brittle as ceramics because there are no cracks present. (d) Ceramics are brittle because there are no dislocations present. 3. Answer a – d with true or false and explain your answer with a short sentence. (a) The mechanical response of polymers is time dependent.
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: (b) The behavior of polymers is temperature independent. (c) Dendimers are insulators under ordinary conditions but doping at the ppm level can turn them into conducting solids. (d) Fuel cells produce electricity by breaking water into hydrogen and oxygen. 4. The following data were collected from a 0.4-in.-diameter test specimen of polyvinyl chloride. After fracture, the gage length is 2.09 in. and the diameter is 0.393 in. Plot the data and calculate a) the 0.2% offset yield strength b) the tensile strength c) the modulus of elasticity d) the % elongation Load (lb) Gage Length (in) 2.00000 300 2.00746 600 2.01496 900 2.02374 1200 2.032 1500 2.046 1660 2.070 1600 2.094 1420 2.12...
View Full Document

{[ snackBarMessage ]}

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