Reliability Physics and Engineering: Time-To-Failure by J. W. McPherson

By J. W. McPherson

"Reliability Physics and Engineering" presents significantly very important info for designing and development trustworthy reasonably priced items. The textbook includes a variety of instance issues of options. Included at the tip of each bankruptcy are workout problems and solutions. "Reliability Physics and Engineering" is an invaluable source for college kids, engineers, and fabrics scientists.

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14b) or γ =− and Q = KB . 15) From the above equations, the power-law exponent n is determined from the partial derivative of the logarithm of time-to-failure ln(TF) with respect to the logarithm of the stress ln(ξ ) while holding the temperature T constant. Thus, to determine n, one usually does a log-log plot of TF versus the stress variable ξ. The slope of the best fitting straight line is n. This is illustrated in Fig. 2. n is simply a power-law exponent and, as such, n is dimensionless. 5 To properly use this equation, the temperature T must be expressed in Kelvin.

5 Competing Degradation Mechanisms Competing mechanisms can also occur (one mechanism is driving an increase in the critical parameter S while the other mechanism is driving a reduction in S). 13) where the first term on the right of the above equation is tending to increase the parameter S while the second term on the right is trying to decrease the parameter S. These mechanisms are competing and can produce either a maximum or minimum in the degradation, as illustrated in Fig. 7. In Fig. 7 If the roles are reversed, the decreasing term 7 An example of competing mechanism comes from the joining/bonding of dissimilar materials.

The prostate-specific antigen (PSA) test is routinely used to detect the possibility of prostate cancer. 0 ngm/ml, but the rate of change is also important. Below are the hypothetical PSA levels for a patient over a three year period. 0 ngm/ml, but is the rate a concern? a) Find the power-law model which best-fits the increase in PSA versus time data. b) Is the increase in PSA occurring at an increasing or decreasing rate? 1 2 (t) (yr)2 b) Since m=2 (>1), the rate of increase for the PSA is very strong and should be noted to the physician.

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