Material Failure: Causes & Solutions

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The discussion centers on the use of a tensiometer to analyze a heat-treated material that exhibited unexpected fracture behavior. Instead of necking in the middle of the dumbbell sample, the material fractured near the chucks of the tensiometer. Key points include the possibility that the sample was gripped too tightly, which can lead to premature failure, particularly in brittle materials like ceramics. Additionally, the presence of porosity at the neck section may contribute to this issue. Improper machining at the neck region, resulting in an inadequate radius, can create stress concentrations that lead to failure before the material reaches its expected performance.
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Hi,

I have been using a tensiometer to help me try and determine what the material is. one of the materials has been heat treated and and instead of a nice necking formation in the middle of the "dumbell sample" it has fractured perpendicular to the sample right next to the chucks of the tensiometer, rather then the thinner section. what is the reasoning behind this?
 
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was it help in too tightly? this happens with ceramics and other brittle materials a lot
 
presence of porosity at the neck section may be reason.
Improper machining at the neck region leads to improper radius which might cause stress concentration at that region causing failure much before.
 

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