Blog

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 = 7 MPa, determine the stress τxy.

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 = 174 με, εy = 829 με, and γxy = –140 μrad. Determine the center εcenter of the corresponding in-plane Mohr’s circle.

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 = 40 MPa, σy = –70 MPa, and τxy = 90 MPa. Determine shear stress τnt at the point for a clockwise coordinate rotation of 70°.

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 = –8 ksi, σy = 9 ksi, and τxy = 9 ksi. Determine principal stress σp1 at the point.

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 = 20 MPa, σy = 70 MPa, and τxy = 20 MPa. Determine principal stress σp2 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 = 890 με, εy = –100 με, and γxy = 710 μrad. Determine the diameter D of the corresponding in-plane Mohr’s circle.

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°.

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 = 30,800 ksi,ν = 0.12], a strain rosette was used to obtain normal strains of εa = 439 με, εb = –200 με, and εc = 418 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 = 400 με, εy = 760 με, and γxy = –100 μrad. Determine the radius R 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 = –15 ksi, σy = –22 ksi, and τxy = –11 ksi. Determine principal stress σp2 at the point.