Tension and Compression Test

To determine the nominal or engineering stress and strain experienced by a specimen of a material while it is subjected to a tension test, and to be able to read important values from a conventional stress-

strain diagram obtained from the test.

A tension test is being conducted on a steel-rod specimen with a gauge length of Lo = 50 mm and initial diameter of do= 13 mm. Data were collected to form the conventional stress-strain diagram as

shown. From the diagram, f = 502 MPa, e = 697 MPa, g = 573 MPa, and h = 0.152 mm/mm

Part A- Nominal or engineering strain in the rod

IT (MPa)

750-

500

250-

fo=f

σ=e

02.04 .06.08.10.12.14.16.18 20 22 24

c=h

do

-σ=8

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e (cm/cm)/nTension and Compression Test

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Part A -Nominal or engineering strain in the rod

Assuming that the strain remains constant throughout the region between the gauge points, determine the nominal strain & experienced by the rod if it is elongated to L = 73.0 mm.

Express the nominal strain in millimeter per millimeter to three significant figures.

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195| ΑΣΦ 11 vec

Submit

Part B - Nominal or engineering stress in the specimen

[5] ΑΣΦ

?

Assuming that the stress is constant over the cross-sectional area and if the tension force used is P = 12.0 kN, find the nominal stress experienced by the rod.

Express the nominal stress in megapascals to three significant figures.

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Ivec

mm/mm

?

<

5 of 5/n

Tension and Compression Test

Part B - Nominal or engineering stress in the specimen

Assuming that the stress is constant over the cross-sectional area and if the tension force used is P = 12.0 kN, find the nominal stress experienced by the rod.

Express the nominal stress in megapascals to three significant figures.

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σ=

Submit

V ΑΣΦ | |

Part C-Force needed to reach the ultimate stress

P =

vec

[5] ΑΣΦ

Determine the force P needed to reach the ultimate stress in the steel-rod specimen.

Express the force in kilonewtons to three significant figures.

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?

11 vec

MPa

?

kN

<

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