Question

"A tension test was conducted on a specimen of AISI 1020 hot rolled steel... (details of the test) ... Determine the following properties from this test: yield stress, ultimate strength, percent elongation, and percent reduction in area. Estimate the toughness."

What properties need to be determined from the test on the AISI 1020 steel specimen?

a) Yield stress, ultimate strength, and toughness.
b) Yield stress, ultimate strength, percent elongation, and percent reduction in area.
c) Toughness, percent elongation, and percent reduction in area.

Answer 1

The properties to be determined from the test on AISI 1020 steel are yield stress, ultimate strength, percent elongation, and percent reduction in area, as well as an estimation of toughness, which is derived from these values.

Step-by-step explanation:

An estimation of the specimen's toughness may also be derived from these values, particularly from the area under the stress-strain curve. The yield stress is the stress at which a material begins to deform plastically. Ultimate strength, also known as tensile strength, is the maximum stress that a material can withstand while being stretched or pulled before necking, which is when the specimen's cross-sectional area starts to significantly contract. Percent elongation is a measure of the ductility and is calculated by the change in length divided by the original length after fracture. Percent reduction in area reflects the material's capacity to undergo plastic deformation before fracture. Toughness is indicative of the material's ability to absorb energy up to fracture and depends on both the yield stress and the tensile strength.