Symbol A
A is part of the quantity the equation computes from the expression on the right.
Read this term in its guide →Published equation contexts
Why this formula appears here
The mechanistic reason accelerated tests can mislead is that raising the stress variable does not always leave the failure mechanism unchanged. Frankel’s review of pitting corrosion lays out how localized breakdown of a passive oxide film depends on a threshold potential, chloride concentration, and temperature in a coupled, nonlinear way — push chloride concentration or temperature far enough and the pitting mechanism itself, and the alloy ranking it produces, can shift relative to what occurs at realistic exposure levels [ 5 ] . The same caution applies to thermal aging of polymers: raising oven temperature to accelerate an Arrhenius-type degradation rate is valid only while the dominant…
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Symbol F
F is part of the quantity the equation computes from the expression on the right.
Read this term in its guide →Symbol k_B
occurs below the fraction bar. The quantity above the bar is divided by this expression; zero is excluded as a denominator.
Read this term in its guide →Symbol T_use
se occurs below the fraction bar. The quantity above the bar is divided by this expression; zero is excluded as a denominator.
Read this term in its guide →How to interpret it
With a fixed numerator, increasing a nonzero denominator reduces the fraction. Read it with the definitions, units, and assumptions supplied by the article.
Research cited beside this formula
Published contexts (1)
A symbol can carry a different meaning in another article. Each occurrence keeps its own guide and term definitions.
Equation 9 · Materials Science
Materials Discovery and Degradation in Practice: An Advanced Technical Guide
This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.
The mechanistic reason accelerated tests can mislead is that raising the stress variable does not always leave the failure mechanism unchanged. Frankel’s review of pitting corrosion lays out how localized breakdown of a passive oxide film depends on a threshold potential, chloride concentration, and temperature in a coupled, nonlinear way — push chloride concentration or temperature far enough and the pitting mechanism itself, and the alloy ranking it produces, can shift relative to what occurs at realistic exposure levels [ 5 ] . The same caution applies to thermal aging of polymers: raising oven temperature to accelerate an Arrhenius-type degradation rate is valid only while the dominant…