This article defines performance indices in a formal way and specifies how they are derived. The performance indices for a light, strong tie and a light, stiff beam are presented. The article provides two case studies that illustrate the use of material indices, shape factors, and selection charts to select materials.
M.F. Ashby, Performance Indices, Materials Selection and Design, Vol 20, ASM Handbook, Edited By George E. Dieter, ASM International, 1997, p 281–290, https://doi.org/10.31399/asm.hb.v20.a0002453
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