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.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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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.
Transcribed Image Text: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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