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 = 100 με, εy = 390 με, and γxy = –220 μrad. Determine normal strain εt at the point for a counterclockwise coordinate rotation of 59°.

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 = 7.90 MPa, G = 2.70 MPa] wristband has an initial length of 90 mm and a width of 12 mm. If the wearer imparts a normal stress of 460 kPa in the length direction while putting it on, what is the corresponding change in width?

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 = 520 με, εy = 790 με, and γxy = –540 μrad. Determine shear strain γnt at the point for a counterclockwise coordinate rotation of 85°.

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 = 370 με, and γxy = –360 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. A silicone rubber [E = 2.60 MPa, G = 0.87 MPa] wristband has an initial length of 94 mm and a width of 11 mm. If the wearer imparts a normal stress of 470 kPa in the length direction while putting it on, what is the corresponding change in width?

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 drill bit, the stresses are σx = 20 MPa, σy = 0 MPa, and τxy = 100 MPa. Determine the magnitude of the maximum in-plane shear stress 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 = –230 με, εy = –260 με, and γxy = 540 μrad. Determine normal strain εt at the point for a counterclockwise coordinate rotation of 40°.

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 structural member, the stresses are σx = 55 MPa, σy = 75 MPa, and τxy = 30 MPa. Determine the magnitude of the absolute maximum shear stress 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 = 490 με, εy = 770 με, and γxy = –170 μrad. Determine normal strain εn at the point for a clockwise coordinate rotation of 75°.

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 = 160 με, εy = –330 με, and γxy = 110 μrad. Determine normal strain εt at the point for a clockwise coordinate rotation of 70°.