Merit exponents and control area diagrams in materials selection
2011 (English)In: Materials & Design, ISSN 0261-3069, Vol. 32, no 10, 4850-4856 p.Article in journal (Refereed) Published
Merit indices play a fundamental role in materials selection, since they enable ranking of materials. However, the conventional formulation of merit indices is associated with severe limitations. They are dependent on the explicit solution of the variables in the equations for the constraints from the design criteria. Furthermore, it is not always easy to determine which the controlling merit index is. To enable the ranking of materials in more general design cases, merit exponents are introduced as generalisations of the merit indices. Procedures are presented for how to compute the merit exponents numerically without having to solve equations algebraically. Merit exponents (and indices) are only valid in a certain range of property values. To simplify the identification of the controlling merit exponent, it is suggested that so called control area diagrams are used. These diagrams consist of a number of domains, each showing the active constraints and the controlling merit exponent. It is shown that the merit exponents play a crucial role when the control area diagram (CAD) is set up. The principles in the paper are developed for mechanically loaded components and are illustrated for engineering beams with two or three geometric variables.
Place, publisher, year, edition, pages
2011. Vol. 32, no 10, 4850-4856 p.
Material selection charts, Performance indices
IdentifiersURN: urn:nbn:se:kth:diva-37638DOI: 10.1016/j.matdes.2011.06.013ISI: 000294373500024ScopusID: 2-s2.0-79960902712OAI: oai:DiVA.org:kth-37638DiVA: diva2:434567
QC 201108152011-08-152011-08-152012-08-23Bibliographically approved