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The thing that will happen to the Yield strength, the Tensile Strength, and the ductility. of a material if you increase the strain rate is option B: The Yield Strength and the Tensile Strength will increase, but the the ductility will decrease.
What connection exists between ductility and yield strength?
Boosting the strain rate or decreasing the temperature has the effect of raising the flow stress and decreasing ductility. The less uniform elongation before necking begins is what causes the poorer ductility; however, significant plastic flow may still be seen within the necked region.
Note that the primary distinction between yield strength and tensile strength is that the former refers to the lowest stress at which a material would permanently deform, whilst the latter refers to the highest tension at which a material will withstand before failing.
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