What is MERIT INDEX?

Criterion for materials selection eg in terms of the best mechanical properties for least weight of material. Relevant for design of vehicles, aerospace products and devices fitted to or by hand eg tools, building products. Products put in tension suggest a merit index of E/p, so for rope, a table of comparative indices can be made. The best materials with high merit indices can thus be filtered and further criteria applied eg cost. See panel on High-performance polymers


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