I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. At a point subjected to plane stress on the surface of a compressed air cylinder, the stresses are σx = 80 MPa, σy = –70 MPa, and τxy = 50 MPa. Determine normal stress σn at the point for a clockwise coordinate rotation of 66°.

I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. A Mohr’s circle is shown for a point in a physical object that is subjected to plane stress. If 1 grid square = 2 MPa, determine the stress σx.

I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. A silicone rubber [E = 7.50 MPa, G = 2.50 MPa] wristband has an initial length of 104 mm and a width of 9 mm. If the wearer imparts a normal stress of 440 kPa in the length direction while putting it on, what is the corresponding change in width?

Create 5 variations of the following problem but do not show the answers. At a point in a body subjected to plane strain, the strains are εx = –350 με, εy = –400 με, and γxy = –100 μrad. Determine the magnitude of the absolute maximum shear strain at the point.

Create 5 variations of the following problem but do not show the answers. At a point on the free surface of a steel automotive component [E = 29,200 ksi,ν = 0.15], a strain rosette was used to obtain normal strains of εa = 175 με, εb = –185 με, and εc = 452 με. Determine normal strain εx at the point.

I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. At a point in a body subjected to plane strain, the strains are εx = –240 με, εy = 20 με, and γxy = 350 μrad. Determine the magnitude of the maximum in-plane shear strain at the point.

I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. At a point subjected to plane stress on the surface of a compressed air cylinder, the stresses are σx = 12 ksi, σy = –22 ksi, and τxy = 16 ksi. Determine normal stress σn at the point for a clockwise coordinate rotation of 84°.

I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. At a point in a body subjected to plane strain, the strains are εx = –20 με, εy = 430 με, and γxy = 810 μrad. Determine the diameter D of the corresponding in-plane Mohr’s circle.

Create 5 variations of the following problem but do not show the answers. At a point subjected to plane stress on the surface of a gusset plate, the stresses are σx = 90 MPa, σy = 60 MPa, and τxy = 90 MPa. Determine principal stress σp1 at the point.

I am a teacher and need help creating exam problems. Please recommend more incorrect answers to the following problem but do not explain your logic. At a point in a body subjected to plane strain, the strains are εx = 89 με, εy = 869 με, and γxy = –545 μrad. Determine the center εcenter of the corresponding in-plane Mohr’s circle.