The Science and Engineering of Materials (MindTap Course List)
The Science and Engineering of Materials (MindTap Course List)
7th Edition
ISBN: 9781305076761
Author: Donald R. Askeland, Wendelin J. Wright
Publisher: Cengage Learning
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Chapter 1, Problem 1.16P

Temperature indicators are sometimes produced from a coiled metal strip that uncoils a specific amount when the temperature increases. How does this work: from what kind of material would the indicator be made; and what are the important properties that the material in the indicator must possess?

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(one or more option can be true please select from below) which of the following will reduce the failure strength or lifetime of a test piece and why?  Decreasing the grain size, more grain boundaries to initiate failure Raising the temperature above the BDTT, more plastic deformation in the lattice will cause it to fail faster   Increasing its volume, greater likelihood of critical defects Decreasing the loading frequency, the material will be at peak stress values for longer  Increasing the difference between the maximum and minimum stress values, as this affects the stress concentration factor
At operating stress of 420MPa, the number of cycles to fail a specimen is 65 cycles. At operating stress of 360MPa, the number of cycles to fail the specimen is 390 cycles, and at operating stress of 130MPa, the number of cycles to fail the specimen is 11,900 cycles. A test sequence as follows is designed: first, operating stress of 420MPa for 7 cycles, second, operating stress of 360MPa for 65 cycles, and third, operating stress of 130MPa for 325 cycles. Determine at what number of cycle and which operating stress level the specimen would be expected to fail if the above sequence is repeated.

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The Science and Engineering of Materials (MindTap Course List)

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