In tribology of polymer cases we know that:
In contrast to other materials, the tribological properties of polymers depend on the tensile strength and the toughness rather than on the hardness. Due to their thermal properties, polymers are very sensitive to frictional heating. Please suggests in case of friction stir welding of polymer, property mainly depend on tensile strength or toughness or hardness?
Your opinion is highly appreciated
Regards
Sudhir
Thank you for your question. In this case Prof. Arshad Noor Siddiquee can give better advice. Please follow or inbox him.
Among three kinds of polymeric materials; thermoplastics, thermosets, and elastomers, only thermoplastics are the weldable polymers. It is due to their ability to be reshaped after heating below their degradation temperature.
Several researchers such as Bilici and Yukler are depending tensile strength especially lab shear.
Bilici MK, Yukler AI (2012) Effects of welding parameters on friction stir spot welding of high density polyethylene sheets. Mater Des 33:545–550
I hope this help you.
Regards
In general there is no correlation between friction and mechanical strength characteristics even for metals not saying about polymers. This is always a balance between ductility and britlleness. i.e it is a question of achieving optimal softening temperatures.
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