Problem 1: Determining the modulus of elasticity and the proportional limit

Condition: A tensile test on a low-carbon steel rod with a diameter of 20 mm and a gauge length of 100 mm yielded the following data:

Under a load of 33 kN, the elongation was 0.05 mm.

Under a load of 66 kN, the elongation was 0.1 mm.

The load corresponding to the proportional limit was 100 kN.

Find:

Young's modulus of elasticity E of the material.

The stress corresponding to the proportional limit σpp.

Problem 2. Determining the Yield Strength and Ultimate Tensile Strength

Condition: A mild steel specimen with a diameter of 10 mm and a gauge length of 50 mm is stretched under load. The cross-sectional area of ​​the specimen after rupture is 55 mm².

At the moment the deformation begins to noticeably inc ... Читать дальше »