lab9(new) - CE 497 Compression Testing of Metals Section 5...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
CE 497 Compression Testing of Metals Section 5
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Hui Fan 4/2/2009
Background image of page 2
INTRODUCTION In this lab, experiments were conducted to investigate the relationship between stress and strain and the relationship between axial and transverse strain. The compression was applied to the specimen and two pairs of strain gages were attached to the surface of specimen to measure the axial and transverse strain. After collecting and processing the data, we expect to find the value of Yong’s elastic modulus and Poisson’s ratios for both specimens. PROCEDURE According to the Hooke’s Law, most engineering materials exhibit a linear relationship between stress and strain within the elastic region and this relationship can be expressed as: Axial Stress = E(young’s elastic modulus) * Axial Strain. When a load is applied to specimen, it changes its length and radius. There is a linear relationship between the transverse strain and axial strain: Poisson’s ratio= |transverse strain/ axial strain|. In this experiment, compression is applied to the ends of the specimen with dimension 3”*1” diameter. To ensure the specimen in the elastic region, the load is added 1000 lb per time. For 1020 HR Steel, up to 10000 lb compression is added and for aluminum, 8000lb is added. We then calculate the stress using the formula: stress=load/area. After we collected and processed the data, we plotted graphs and expected to observe the linear relationship between strain and stress, axial and transverse strains. We also expected to find out the Yong’s modulus and Poisson’s ratios for both specimens by calculation and graph method. RESULTS Table 1n Specimen Material: 1020 HR Steel
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Measured Calculated Nu mb er Load (lb) Di a m et er (in ) Strains Area (in*in ) Stress (psi) Strains Stress /Axial Strain Transv erse Strain/ Axial Strain Axia l 1 Axia l 2 Tra nsv ers e 1 Tra nsv ers e 2 Axial Aver age Tran svers
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/06/2010 for the course CEM CEM497 taught by Professor Ku during the Spring '10 term at Punjab Engineering College.

Page1 / 9

lab9(new) - CE 497 Compression Testing of Metals Section 5...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online