MT-1620 Fall 2002 We do not characterize materials by their enno the emon are mpg useful in doing transformations manipulations etc We characterize materials by their ENGINEERING CONSTANTS (or, Elastic Constants) (what we can physically measure There are 5 types 1. Longitudinal young s)(Extensional)Modulus: relates extensional strain in the direction of loading to stress in the direction of loading (3 of these) 2. Poissons Ratio: relates extensional strain in the loading direction to extensional strain in another direction (6 of these.. only 3 are independent Paul A Lagace @2001 it 5-p. 2MIT - 16.20 Fall, 2002 We do not characterize materials by their Emnpq. The Emnpq are useful in doing transformations, manipulations, etc. We characterize materials by their “ENGINEERING CONSTANTS” (or, Elastic Constants) (what we can physically measure) There are 5 types 1. Longitudinal (Young’s) (Extensional) Modulus: relates extensional strain in the direction of loading to stress in the direction of loading. (3 of these) 2. Poisson’s Ratio: relates extensional strain in the loading direction to extensional strain in another direction. (6 of these…only 3 are independent) Paul A. Lagace © 2001 Unit 5 - p. 2