[Eng Apps] Stress/Strain/Modulus of Elasticity Calculations

It is expressed as the ratio of the applied force divided by the resisting area.

• stress

• strain

• elongation

• tensile strength

What is the amount of deformation in the direction of the applied force divided by the initial length of the material

• strain

• stress

• force

• pascals

A weight of 18,000 lb is supported on a rectangular baseplate that is 9-in. wide and 2-ft long. The baseplate rests on a concrete slab. Determine the stress (in psi) that the baseplate exerts on the concrete slab.

• 83.3 psi

• 85.4 psi

• 166.7 psi

• 170.1 psi

A certain rod material is expected to break at a normal stress of 48,447 psi. If the tensile testing machine can apply no more than 800 lb of force to the specimen, calculate the maximum rod diameter that should be used for the specimen.

• 0.136 in

• 0.0046 in

• 0.068 in

• 0.145 in

Determine the maximum load that a 0.50-in. diameter steel rod can support if the normal stress in the rod must not exceed 24,000 psi.

• 18,849.6 lbs

• 4712.4 lbs

• 122,231 lbs

• 4938.2 lbs

A ¼-in. diameter rod must be machined on a lathe to a smaller diameter for use as a specimen in a tension test. The rod material is expected to break at a normal stress of 63,750 psi. If the tensile testing machine can apply no more than 925 lb of force to the specimen, calculate the maximum rod diameter that should be used for the specimen.

• 0.136 in

• 0.0046 in

• 0.068 in

• 0.0145 in

Determine the maximum load that a 0.50-in. diameter steel rod can support if the normal stress in the rod must not exceed 24,000 psi.

• 18,849.6 lbs

• 4712.4 lbs

• 122,231 lbs

• 4938.2 lbs

A 1.25 in. by 3 in. rectangular steel bar is used as a diagonal tension member in a bridge truss. The diagonal member is 20 ft long, and its modulus of elasticity is 30,000,000 psi. If the strain in the diagonal member is measured as 0.001200 in./in., determine the total elongation of the bar.

• 0.33 in

• 0.29 in

• 1.25 in

• 0.42 in

calculate the stress in the specimen given above

• 28.7 GPa

• 287 GPa

• 2.87 GPa

• 0.287 GPa

Determine the maximum load that a 25mm diameter copper rod can support if the normal stress in the rod must not exceed 545 MPa.

• 1,070,100 N

• 1070 kN

• 267,526 N

• 267,526 kN