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material science examination, Exams of Material Science and Technology

this is a sample of the questions that will be asked don the exam

Typology: Exams

2020/2021

Uploaded on 04/28/2021

f-samman
f-samman 🇨🇦

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Quiz # 4 MECH 321 Winter 2020
NAME: ID #:
INSTRUCTIONS: Please put your answers below each question, use more pages as
required.
Either:
1. SAVE the file as a word.doc, or pdf, with your ID number and then UPLOAD using
the Moodle assignment.
2. Scan or take pictures of your pages and rename with your ID number and then
UPLOAD using the Moodle assignment.
QUESTION 1 (5 POINTS)
Three identical fatigue specimens (denoted A,
B, and C) are fabricated from a nonferrous
alloy. Each is subjected to one of the
maximum–minimum stress cycles listed in the
following table; the frequency is the same for
all three tests.
a) Rank the fatigue lifetimes of these 3 specimens from the longest to the shortest. Justify your
answer. (It may help to make a schematic S-N plot).
b) Suppose that the specimens are fabricated from a stainless steel. What additional information
is needed to rank the fatigue lifetimes of the specimens? Justify your answer.
c) List four measures that may be taken to increase the fatigue lifetime of a metal alloy.
ANSWER Q1
QUESTION 2 (5 POINTS)
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Quiz # 4 MECH 321 Winter 2020 NAME: ID #: INSTRUCTIONS: Please put your answers below each question, use more pages as required. Either:

  1. SAVE the file as a word.doc, or pdf, with your ID number and then UPLOAD using the Moodle assignment.
  2. Scan or take pictures of your pages and rename with your ID number and then UPLOAD using the Moodle assignment. QUESTION 1 (5 POINTS) Three identical fatigue specimens (denoted A, B, and C) are fabricated from a nonferrous alloy. Each is subjected to one of the maximum–minimum stress cycles listed in the following table; the frequency is the same for all three tests. a) Rank the fatigue lifetimes of these 3 specimens from the longest to the shortest. Justify your answer. (It may help to make a schematic S-N plot). b) Suppose that the specimens are fabricated from a stainless steel. What additional information is needed to rank the fatigue lifetimes of the specimens? Justify your answer. c) List four measures that may be taken to increase the fatigue lifetime of a metal alloy. ANSWER Q QUESTION 2 (5 POINTS)

Quiz # 4 MECH 321 Winter 2020 For an S-590 alloy (in attached graph), predict the time to rupture for a component that is subjected to a stress of 150 MPa at 727 C. ANSWER Q