Learning objectives Introduce explore orthogonality Study the standard oas Practice computing dOF of an experiment Learn how to select a standard oa Introduce means to modify Oas Consider studying interactions in Oas Robust System Design

Comments on hw#2 and Quiz #1 Questions on the reading Quiz Brief lecture Paper Helicopter Experiment Robust System Design 16.881

The following stress-strain curves were obtained for dif- ferent materials subjecting the specimen to the loading path(a, b, c, d ). Which one(s) of them correspond to elas- tic material(s)

Which of the following expressions represents the rate of work done by the stresses during the deformation of a body of an arbitrary material?

Which of the following expressions most ac curately and simply represents the comple mentary strain energy density Uc of a linear elastic material?

Which of the following are real problems with the ritz method 1. Selection of basis functions for general ge- metres 2. Lack of systematic procedure to compute stiff atrix and forcing terms

he finite element Metnod Overcome limitations of Rita Simple basis functions( ow order polyuouisls) Basisfonctians supported in sdo domains(fuite elemnet Basis functions constructed to provide interpolant of proximate soluton Undetermined beraweters represent vales of dead

The finite element melod I In FEM I We derived basis functions of arbitrary order for Hhe rod Model

By looking at the potential energy of an element, what can you conclude about the properties required for the basis functions of an euler -bernoulli beam element? They should be differentiable twice

The correct global local node mapping for the quadraticelement mesh in the figure is