Dear researchers,
I conducted tensile test on Al based Al-Zn binary alloy wherein I found that the failure mainly occurs at the grip area and not at the gage area. At the same time all the samples have broken at the same stress.
Likely an imperfection is introduced on the specimen causing stress/strain to localize to the point where you observe failure.
If failure occurs directly at the gripping of the specimen it might be the grip deforming, thinning or pressing marks into the material, the specimen. If the gripping is hydraulic reducing the clamping force might be an option.
If failure occurs in the transition from gage to head of the specimen an imperfection from specimen production could be the reason. Such imperfections can be caused by specimen design in CAD and are not necessarily caused by manufacturing.
If there was a heat treatment of the specimen an uneven temperature distribution can cause failure at unintended positions.
Захватывая материал, мы создаём деформацию кристаллической решётки бинарного сплава, что и приводит к разрушению в этой области при испытании на растяжение.
Dear Mr. Podder
Very interesting question. Need more info about your alloy. Crystal structure, Casting method, percentage. Also have you characterize the failure or not?
In general impurities causes failure. And failure generates at the weakest point of an alloy along the preferable slips. So, breaking can be anywhere depending on the casting methods and how well the method is.
Thank You.
Dujana
It may be due to "Stress Concentration" effect at the gripped area.
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