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How do you calculate toughness?

In: Physics, Mechanical Engineering [Edit categories]

Answer:

Toughness is a term used to describe a material's resistance to failure, or its ability to absorb the energy of impact, if that is clearer. A couple of methods of testing toughness involve putting a (known) weight on a swinging arm, raising it a certain distance, and letting it swing down into a test piece of material into which a notch has been cut. This way a known amount of energy can be impressed against a sample of fixed dimension and a relative toughness demonstrated.

In the physics department on exam day, we'd be given a stress-strain graph (or, more probably, the variables to plot the graph) and we'd "find the area under the curve" using integral calculus to discover an answer. The formula and the graphs (which cannot be put up here) can be seen by using the links to the Wikipedia articles. Additionally, a link is provided to a post on the Izod method of impact strength testing of plastics put up by MatWeb, which is a site dedicated to the properties of materials. Have a quick look.

First answer by Quirkyquantummechanic. Last edit by Quirkyquantummechanic. Contributor trust: 3691 [recommend contributor ]. Question popularity: 2 [recommend question].

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