MT-1620 al.2002 Values of c te,s Note: a=a Anisotropic Materials 6 possibilities: a11, 022, a33, 012, 013, 023 →△ T can cause shear strains not true in"engineering " materials Orthotropic Materials 3 possibilities: a,1,022, 0.33 AT only causes extensional strains Notes Generally we deal with planar structures and are interested only in a11 and a22 2 If we deal with the material in other than the principal material axes, we can"have an a12 Transformation obeys same law as strain (it's a tensor) Paul A Lagace @2001 Unit 9-p 8MIT - 16.20 Fall, 2002 Values of C.T.E.’s Note: αij = αji • Anisotropic Materials 6 possibilities: α11, α22, α33, α12, α13, α23 ⇒ ∆T can cause shear strains not true in “engineering” materials • Orthotropic Materials 3 possibilities: α11, α22, α33 ⇒ ∆T only causes extensional strains Notes: 1. Generally we deal with planar structures and are interested only in α11 and α22 2. If we deal with the material in other than the principal material axes, we can “have” an α12 Transformation obeys same law as strain (it’s a tensor). Paul A. Lagace © 2001 Unit 9 - p. 8