MT-1620 Fall 2002 Thus X Key concept: The letters used for indices have no inherent meaning in and of themselves Thus:xi= y is the same as: X,=fs ys or x =fi yi Now apply these concepts for stress/strain analysis 1. Coordinate System Generally deal with right-handed rectangular Cartesian: y Paul A Lagace @2001 Unit 3-p. 6MIT - 16.20 Fall, 2002 Thus: xi = ….. ⇒ x1 = ….. x2 = ….. x3 = ….. Key Concept: The letters used for indices have no inherent meaning in and of themselves Thus: xi = fij yj is the same as: xr = frs ys or xj = f y ji i Now apply these concepts for stress/strain analysis: 1. Coordinate System Generally deal with right-handed rectangular Cartesian: ym Paul A. Lagace © 2001 Unit 3 - p. 6