Tensile lab report
1.0 Abstract
The elastic modulus, yield point, and ultimate strength of mild steel were determined in uniaxial tension. The "dogbone" specimen geometry was used with the region of minimum cross section having the dimensions: thickness =1.04 mm, width = 3.14 mm, and length section = 30 mm. This experiment was accomplished by first placing our specimens one at a time into a tensile testing machine (A G.U.N.T Hamburg Tensile Testing Machine (Max. load = 2kN)), which, under physical control, slowly increased the tension force on each specimen, stretching each until failure. We then analyzed the data output from the load and extension gauge. Referring from the resultant graph, we can see that the obtained graph line is straight until the one point it decrease gradually and be rupture. This shows that both variables on the graph are linearly related with each other. From the data obtained, we identify types of fracture surface of mild steel under tensile loading. The yield strength was determined to be 165.165MPa.The ultimate strength was determined to be 285.285MPa.Calculation for percentage elongation was determined to be 43 percent. After all, experimental result was compared with theoretical data.
Table of Contents
List of table:
List of Figures:
List of Symbols
A Area over which force (F) acts (m2)
E Elastic modulus (GPa)
F Force (N) Initial dimension in direction i (mm)
T Specimen thickness (m) Rate of chart displacement (mm/min) Rate of sample displacement (mm/min) w Specimen width (m) Displacement of chart (mm) Displacement of sample (mm) Strain =0 Predicted strain at zero stress Normal strain in direction i
E Error in the predicted elastic modulus (GPa)
F Error in the force (N) Change in dimension in direction i (mm) t Error in the specimen thickness (m) w Error in the width (m) =0 Error in the predicted strain at zero stress Error in the
The elastic modulus, yield point, and ultimate strength of mild steel were determined in uniaxial tension. The "dogbone" specimen geometry was used with the region of minimum cross section having the dimensions: thickness =1.04 mm, width = 3.14 mm, and length section = 30 mm. This experiment was accomplished by first placing our specimens one at a time into a tensile testing machine (A G.U.N.T Hamburg Tensile Testing Machine (Max. load = 2kN)), which, under physical control, slowly increased the tension force on each specimen, stretching each until failure. We then analyzed the data output from the load and extension gauge. Referring from the resultant graph, we can see that the obtained graph line is straight until the one point it decrease gradually and be rupture. This shows that both variables on the graph are linearly related with each other. From the data obtained, we identify types of fracture surface of mild steel under tensile loading. The yield strength was determined to be 165.165MPa.The ultimate strength was determined to be 285.285MPa.Calculation for percentage elongation was determined to be 43 percent. After all, experimental result was compared with theoretical data.
Table of Contents
List of table:
List of Figures:
List of Symbols
A Area over which force (F) acts (m2)
E Elastic modulus (GPa)
F Force (N) Initial dimension in direction i (mm)
T Specimen thickness (m) Rate of chart displacement (mm/min) Rate of sample displacement (mm/min) w Specimen width (m) Displacement of chart (mm) Displacement of sample (mm) Strain =0 Predicted strain at zero stress Normal strain in direction i
E Error in the predicted elastic modulus (GPa)
F Error in the force (N) Change in dimension in direction i (mm) t Error in the specimen thickness (m) w Error in the width (m) =0 Error in the predicted strain at zero stress Error in the
References: 1. Ashby, M. (2006). Engineering Materials 1: An Introduction to Properties, Applications and Design. 3rd ed. Butterworth-Heinemann 2. Hibbeler, R.C. (2004). Statics and Mechanics of Materials. Prentice Hall. 3. Tarr, M. (no date). Stress and its effect on Materials [online]. Available from 4. http://www.ami.ac.uk/courses/topics/0124_seom/index.html. [Accessed 29/03/14]. 5. Van Vlack, L.H., Introduction to Materials Science and Engineering - 6th Edition, Addison Wesley, 1989, p 8. 6. Smith,W.F., Principles of Materials Science and Engineering - 2nd Edition, McGraw Hill, 1990, p 255. 7. Van Vlack, L.H., Introduction to Materials Science and Engineering - 6th Edition, Addison Wesley, 1989, p 556. 8. Dewey, B. R., Introduction to Engineering Computing - 2nd Edition, McGraw-Hill, 1995, p 69. 8.0 Appendices