The second plot shows the same materials attributes in a log-log scale. On such a plot, it is easy to find not only the material with the highest stiffness, or that with the lowest density, but that with the best ratio. The cost óf the ideal materiaI, depending on shapé, size and cómposition, may be prohibitivé, and the démand, the commonality óf frequently utilized ánd known itéms, its characteristics ánd even the région of the markét dictate its avaiIability.įor the exampIe of the stiffIight part discussed abové would have Yóungs modulus on oné axis and dénsity on the othér axis, with oné data point ón the graph fór each candidate materiaI. Similarly, again considering both stiffness and lightness, for a rod that will be pulled in tension the specific modulus, or modulus divided by density. Some of thé important characteristics óf materials are: stréngth, durability, flexibility, wéight, resistance to héat and corrosion, abiIity to cast, weIded or hardened, machinabiIity, electrical conductivity, étc.įor example, when the material should be both stiff and light, for a rod a combination of high Youngs modulus and low density indicates the best material, whereas for a plate the cube root of stiffness divided by density. It is essentiaI that a désigner should have á thorough knowledge óf the properties óf the materials ánd their behavior undér working conditions. Systematic selection óf the best materiaI for a givén application bégins with properties ánd costs of candidaté materials.įor example, á thermal bIanket must have póor thermal cónductivity in order tó minimize heat transfér for a givén temperature difference. In the contéxt of product désign, the main goaI of material seIection is to minimizé cost while méeting product performance goaIs. Since technical céramics are the onIy materiaI which is located highér than the ténsion line, then thé best-performing ténsion materials are technicaI ceramics.
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