ME 220 Materials Lab
Lab 6 – Tensile Test
To determine the strength and several elastic and inelastic properties of various materials and to observe
the deformation and fracture behavior of materials under load.
Universal testing machine (UTM), aluminum/steel/cast iron rod, digital extensometer, digital caliper
Please wear safety glasses in the lab. You are not allowed to start the testing machine unsupervised.
1. Measure cross sectional area of steel rod
2. Mark off 2-inch gage length
3. Place the rod in the load cell
4. Attach the extensometer to the specimen
5. Calibrate the load cell and the strain gage extensometer
6. Turn on the load cell
7. Record strain every 500-lbs until it fractures
8. Take off extensometer once necking forms and record using a ruler (For brittle materials, take off the
extensometer before estimated fracture around 12~15k-lbs)
9. Repeat steps 1-8 using the aluminum rod/cast iron rod
Virtual Lab Link
You can use the above link to perform a simulated tensile test.
1.Using the virtual tensile test data, calculate the upper yield stress, lower yield stress, tensile strength,
elastic modulus and elongation.
2. (a) Using experimental data for different materials (C1018 steel, 6061 Aluminum and cast iron),
compute instantaneous strain and stress during the tests. Report sample calculations.
(b) Plot the stress-strain relationship. Based on the graph, discuss whether it is brittle or ductile material
and whether the graph line meets your expectation. Explain the reason.
(c) Estimate Young’s modulus in the elastic region based on the graph.
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.Read more
Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.Read more
Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.Read more
Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.Read more
By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.Read more