BAE 2023
Experiment-2
Strength of materials
Name
Date:
Team:
Objective: The goal of this laboratory exercise is to:
• Become familiar with a universal testing machine
• Conduct tensile tests on biomaterials
• Identify safety hazards in the lab
Introduction: The destructive tensile test is the most important method for determining the mechanical properties
of materials.
Equipment:
 Intron testing machine
Procedure:
Tensile Testing
1. Select testing material (2 samples)
2. Make sure you always get initial dimensional measurements for the samples before testing.
3. Conduct a test at one rate of crosshead travel. Double the rate and run the test again the same set of samples
4. Determine the normal stress and normal strain (page 112 text), and apparent modulus of elasticity (page 114115) for each of the samples.
Questions
1). Using Excel, plot stress-stain relationship curve. Axes must be labeled and have units.
2) Compare the ultimate stress of metal coupons for each thickness. Comment on any variation.
3) Identify two potential safety hazards one might encounter when using the Instron machine for tensile and
compression testing. What should be done to guard against these hazards?
Your lab report should include items such as objective, detailed procedure, formulas used, discussion of how
results compare with published values, possible sources of error and conclusions. On the title page, list the team
members and each of the contributions to this lab project. Report due date: 8th February, 2012
Sample -1
1. Speed (
)
2. Width (
)
3. Thickness (
)
4. Computed area (
)
5. Test Length, shoulder to shoulder (
6. Ultimate tensile strength (
)
Test-1
Test-2
Test-1
Test-2
)
Sample -2
1. Speed (
)
2. Width (
)
3. Thickness (
)
4. Computed area (
)
5. Test Length, shoulder to shoulder (
6. Ultimate tensile strength (
)
)