The state of strain at a point in a rectangular block of material using an x-y coordinate system is given by: • €xx = 51x10-4 €yy = 18 ×10-4 • Yxy=-4x10-4 ● Part One a) Which element below best represents the deformed element due to the state of strain in the x-y plane?

3. An aluminum material element experiences a state of plane stress with the magnitudes and directions of the stress components given in the figure. Please calculate the change in volume per unit volume this material element would experience when subjected to the stress state given in the image below and a temperature increase of 80°C. (Note that the dotted horizontal line and 15 degree angle are irrelevant to this problem). Aluminum Properties: Thermal Coefficient of Expansion = 24 x 10-6 mm/mm/°C, Elastic Modulus = 69 GPa, Poisson Ratio = 0.35 250 MPa 60 MPa 15° 150 MPa