Temperature-Nonthermal Relationship Example: Difference between revisions

From ReliaWiki
Jump to navigation Jump to search
No edit summary
No edit summary
 
(3 intermediate revisions by 3 users not shown)
Line 1: Line 1:
<noinclude>{{Banner_ALTA_Examples}}
<noinclude>{{Banner_ALTA_Examples}}
</noinclude>Twelve electronic devices were put into a continuous accelerated life test and the following data were collected.
''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}
Line 11: Line 15:
   \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

ALTA Examples Banner.png


New format available! This reference is now available in a new format that offers faster page load, improved display for calculations and images and more targeted search.

As of January 2024, this Reliawiki page will not continue to be updated. Please update all links and bookmarks to the latest references at ALTA examples and ALTA reference examples.




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.

ALTA10t1.png

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.

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.

Acceleration facton versus temperature given a constant voltage of 2V