Analyze your data regarding impact energy. Determine the DBTT, for operation of the Charpy machine

Data: ************Material A************* ##############Material B ############

Temps:

Energy:

Lateral

Expansion:

Fracture App.

Q Plot Energy, Fracture Appearance, and Lateral Exp. vs. Temp. (for each material) with measure bars:

For each material: ****Material A**** ####Material B####

Q What (value) is the DBTT (at 50% energy difference)?

Q What is the DBTT (at Eo = 60 joules or 81 ft-lb)?

Q What is the DBTT (using 50% Fracture Appearance)?

Q What is the DBTT (using 50% Lateral Expansion)?

Q What ‘transition temperature’ value do you assign to each material? Please explain your choice?

Material A:

Material B:

Q What are your two materials? Mat A:____________ Mat B:___________

Q How accurate is your DBTT value? (Compare values with literature via percent error. Explain.).

Material A:

Material B:

Q How precise is your DBTT value? (What tolerance do you give it? Explain how you determined it).

Q Use two examples (using a different issue for each example) to explain how our test procedure deviates from E23 (and could result in errors).

The following items should be completed for this lab:

1. General: Characterize the impact and fracture behavior of the given material via DBTT.

2. Results: Include tabulated temperature data with graphs

Include the graphs and final values for the Transition Temperature.

3. Discuss: ASTM E23 and how we’ve used it relevant to our tests.

Issues related to the tolerance and accuracy of the data.