{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

exam2fall01 - ENSC 3313 Fall 2001 Name TEST 2'Answer alll O...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Name ENSC 3313, Fall 2001 TEST 2 .'- Answer alll O Questions. 2 points each. ,$-"' Shown is the load-elongation plot for a tensile specimen of circular cross section, 0.25 inches diameter and 1.0 inches gauge length. Determine the a) tensile strength (ksi), b) yield strength (ksi), c) elastic modulus, and d) strain at fracture. 1 Cross sectional area = 7t(0.25)2/4 = 0.049 in2 * Stress = Load/O.O49! * One inch gauge length, so elongation equals strain. * Hence a) TS = 1300/0.049 -26.5 ksi b) YS(0.5% extension) -850/0.049 -17.4 ksi c) (500/0.049)/0.002 = 5 x 106 Rsi d) Read off plot, -~ 0. b o.~ o'~ ~LUI'4GA7'oN. ;,.r Lt.. / Tell about the Rockwell B (HRB) hardness test! a) What is the indenter? b) What is the load? c) What is the hardness measured in terms of? d) Deduce why there are other Rockwell scales besides B. 2. a) A 1/16" diameter hard steel sphere b) 100 kg c) depth of penetration d) For soft materials, would need a lower load and/or a larger diameter penetrator; for hard materials, would need a diamond indenter and a large load. Machine won't work if penetration is too much or too little. Also, indenter must not deform.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
The starting material is a 10 mm diameter rod of ~ brass (85Cu -15Zn) of HRB 80. Required is an ~ diameter rod ofHRB 70. Describe an appropriate processing sequence. (,(0 3 ~ , ~ .,...1 HRB 70 signifies a final processing stage of ~ 32% CW.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the 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