They are derived from experimental data.

Hi,

You say “typical assumed” coefficients, but where do these numbers actually originate from?
I understand that they are based on experimental data rather than “assumed”?

November 30, 2018

The Southern Regional Education Board (SREB) and the state of Ohio are partnering in the development of an Automated Materials Joining Technology (AMJT) curriculum for high school students. The curriculum is part of SREB’s Advanced Career (AC) project that involves 9 states in the development of project-based curriculum with each state authoring its own unique career area.

We are writing to request copyright permission for teachers and students to view the following link for completing Project 2 in Course 4 (Projects in Automated Materials Joining):

http://www.desolutions.com/blog/2014/10/temperature-cycling-testing-coffin-manson-equation/

Also, no changes in or deletion of author attribution, trademark, legend, or copyright notice will be made, if permission is granted.

We hope you will be able to respond positively to our request.

We will cite appropriately.

Thanks.
Jim Berto

James J. Berto
AC Program Manager/Research Associate, School Improvement
Southern Regional Education Board
592 Tenth Street, N. W.
Atlanta, GA 30318-5776
Phone 404-875-9211, ext. 228
Direct 404-879-5528
Fax 404-872-1477
james.berto@sreb.org
http://www.sreb.org

We will note your page as a benchmark for Temperature Cycling Testing: Coffin-Manson Equation.

We also invite you to link and other web resources for equations
like equation-solver.org or https://en.wikipedia.org/wiki/Equation.
Thank you ang good luck!

I’m writing my thesis, and I’m about to run a thermal shock test for some car lighting panels. What ΔT use, and m exponent value should I use? It’s a normal panel, with some leds on it, inside the car cabin. I want to test the solder joints.

Thanks for your help beforehand.

Assume Tuse and exponent (m) are the same for both. Calculate acceleration factor AF1 using -55/125 (Test ΔT= 180), then calculate AF2 using -65/150 (Test ΔT= 215).

Was wondering if you have a equivalency table on stress for -55/125 vs -65/150. Appreciate if you could share this info. Thanks!