Final answer:
To calculate engineering stress, divide the load by the cross-sectional area. To calculate engineering strain, divide the change in length by the original length. However, data might be missing for a complete solution.
Step-by-step explanation:
The student's question involves the calculation of engineering stress and strain for a tensile specimen. To calculate engineering stress, we divide the applied load by the original cross-sectional area of the specimen. Engineering strain is calculated by dividing the change in length by the original gage length of the specimen, assuming the deformation is within the elastic region.
The original cross-sectional area (Ao) of the specimen is found using the diameter before the load was applied. Since the specimen is circular, the area would be Ao = π(d/2)2, where d is the original diameter.
Engineering stress (σ) is thus calculated by:
σ = Load / Ao
σ = 5000 lbs / π(0.375 in)2
To calculate the engineering strain (ε), we need the change in length (∆L), however, since the question does not provide this and only a change in diameter is given, the student might be misunderstanding the problem or missing information. In typical tension stress-strain problems, strain would be calculated as:
ε = ∆L / Lo
where Lo is the original gage length.