Quasi-static test is usually stopped when the peak load degrades to 80-85% or at the substantial damage to the specimen, whichever occurs earlier. Why the load degradation criteria is set to 80-85%?
Any response will be helpful.
https://www.hindawi.com/journals/sv/2018/5643872/
You may find your answer in the above article.
These days people don't stop at 85% of ultimate load. They apply load until, you are able to apply load. This helps to determine collapse load.
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