Materials, Properties and Design

Table of Contents




Selection Issues

· The quantities (E/ρ), (E/ρ2), and (E/ρ3) are all employed in material selection. The diagram shows a log-log plot of Young's modulus versus density for a wide range of materials. The yellow zone is metal alloys, the blue polymers, the green composite materials, and the brown woods. The red line represents a selected value of (E/ρ). All materials above the line have a higher value of this parameter, all below the line a lower value. If the selected value of (E/ρ) is based on a design criterion, those materials above the line exceed this criterion and merit further examination.

From: Ashby, Materials Selection, Pergamon (1993)