MT-1620 Fall 2002 3. Stress-Strain(6 Omn -mpg pg we 'll come back to this Let's review the 4th important concept Static Determinance There are there possibilities (as noted in U.E.) a. a structure is not sufficiently restrained ( fewer reactions than d o f. degrees of freedom → DYNAM|CS b. Structure is exactly (or"simply)restrained of reactions = of d o f → STATICS( statically determinate Implication: can calculate stresses via equilibrium(as done in Unified) Paul A Lagace @2001 Unit 4-p. 5MIT - 16.20 Fall, 2002 3. Stress - Strain (6) σmn = Emnpq εpq we’ll come back to this … Let’s review the “4th important concept”: Static Determinance There are there possibilities (as noted in U.E.) a. A structure is not sufficiently restrained (fewer reactions than d.o.f.) degrees of freedom ⇒ DYNAMICS b. Structure is exactly (or “simply”) restrained (# of reactions = # of d.o.f.) ⇒ STATICS (statically determinate) Implication: can calculate stresses via equilibrium (as done in Unified) Paul A. Lagace © 2001 Unit 4 - p. 5