Temperature-Nonthermal Relationship Example: Difference between revisions
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<noinclude>{{Banner_ALTA_Examples}} | <noinclude>{{Banner_ALTA_Examples}} | ||
</noinclude> | ''This example appears in the [https://help.reliasoft.com/reference/accelerated_life_testing_data_analysis Accelerated life testing reference].'' | ||
</noinclude> | |||
12 electronic devices were put into a continuous accelerated life test and the following data were collected. | |||
[[Image:ALTA10t1.png|center|400px|]] | [[Image:ALTA10t1.png|center|400px|]] | ||
Using ALTA and the T-NT lognormal model, the following parameters were obtained: | Using ALTA and the T-NT lognormal model, the following parameters were obtained: | ||
::<math>\begin{align} | ::<math>\begin{align} | ||
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\widehat{C}=\ & 0.035292 \\ | \widehat{C}=\ & 0.035292 \\ | ||
\widehat{n}=\ & 0.776797 | \widehat{n}=\ & 0.776797 | ||
\end{align}</math> | \end{align}\,\!</math> | ||
A probability plot, with the 2-sided 90% confidence bounds for the use stress levels of 323K and 2V, is shown next. | A probability plot, with the 2-sided 90% confidence bounds for the use stress levels of 323K and 2V, is shown next. | ||
[[Image:T-NT_Ex1.gif|center|600px|Probability plot for the use stress levels of 323K and 2V]] | [[Image:T-NT_Ex1.gif|center|600px|Probability plot for the use stress levels of 323K and 2V]] | ||
An acceleration factor plot, in which one of the stresses must be kept constant, can also be obtained. For example, in the following plot, the acceleration factor is plotted versus temperature given a constant voltage of 2V. | An acceleration factor plot, in which one of the stresses must be kept constant, can also be obtained. For example, in the following plot, the acceleration factor is plotted versus temperature given a constant voltage of 2V. | ||
[[Image:T-NT_Ex2.gif|center|600px|Acceleration facton versus temperature given a constant voltage of 2V]] | [[Image:T-NT_Ex2.gif|center|600px|Acceleration facton versus temperature given a constant voltage of 2V]] | ||
Latest revision as of 19:03, 18 September 2023
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This example appears in the Accelerated life testing reference.
12 electronic devices were put into a continuous accelerated life test and the following data were collected.
Using ALTA and the T-NT lognormal model, the following parameters were obtained:
- [math]\displaystyle{ \begin{align} \widehat{Std}=\ & 0.182558 \\ \widehat{B}=\ & 3729.650303 \\ \widehat{C}=\ & 0.035292 \\ \widehat{n}=\ & 0.776797 \end{align}\,\! }[/math]
A probability plot, with the 2-sided 90% confidence bounds for the use stress levels of 323K and 2V, is shown next.
An acceleration factor plot, in which one of the stresses must be kept constant, can also be obtained. For example, in the following plot, the acceleration factor is plotted versus temperature given a constant voltage of 2V.
