Report on the testing of shear strength
- Maciek Pajak (Deactivated)
Abstract/Summary
This section will include the following (and maybe some other stuff I missed?)
Highlight of results
What test we are doing (tensile, compression anvil pendulum etc.)
Some more specific information we missed, for example, we used our own equipment, we didn’t have the correct equipment so we had to choose something else, something that may have messed up our test results? (feel free to add other things you believe are important to note)
Lack of test specimens for the standard quantity that standards require?
Link to ASTM Standard summary?
Introduction
In this experiment, we will be determining the shear strength of our own CF composite sandwiches by means of a 3-point bend test. We will use the failure force to calculate the shear strength of our materials. We will use these results and compare them to simulations and see if our carbon fibre is up to standard. We will also be noting failure modes encountered during our experiment. The one most likely to occur will be local core crushing. We consulted ASTM C393_Standard Test Method for Shear Strength for this particular experiment.
Materials
Equipment required
Micrometres
Callipers
Deflectometer
Conditioning/environmental testing chamber
Procedures
Below is a schematic of which test configuration we used with the values below:
Below is a picture of our apparatus:
Test Specimen Prep
Here, we can outline how we prepared the specimen along with the dimensions we went with, sorta similar to what Tommy did here in the specimen prep section:F2020 - Bottom Panel Structural Evaluation?
I believe this section is something that we would do in person. We still have to finalize if we actually do any specimen conditioning or the final dimensions of our test specimens.
Raw Data
Specimen Number | Maximum Force (N) | Failure Force (N) | Head displacement (mm) | Deflection (mm) |
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This isn’t what actually happened, I just want to show how the organization would look
Failure mode | Picture of failure mode |
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During the test, we faced a debonding failure mode during the test for specimen number 2. (area and location of failure? please explain to me what this means). (Please tell me how I could better word this, would appreciate the feedback) | Specimen number 2 |
During the test, we faced a debonding failure mode during the test for specimen number 2.
(Please tell me how I could better word this, would appreciate the feedback)
Specimen number 2
Pls tell me which one you think looks better? After putting it in the table, I’m leaning towards that.
Processed Data
Preliminary calculations
Variable | Quantity | Notes |
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Support span | 150 mm | Approximate |
Depth of Specimen | Will vary between each specimen | Averaged measurement |
Load rate | 6 mm/min | This is the load rate that was used during the ASTM process |
Loading span | Varied by specimen? | Averaged measurement |
Specimen Number | Depth of Specimen (mm) | Loading span (mm) |
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Is there anything that I’m missing?
Post-testing calculations
*remember to put sample calculations for each of the 3 calculations below when we come to it*
Specimen Number | Cores Shear Ultimate Stress (MPa) | Core Shear Yield Stress (MPa) | Facing Stress (MPa) |
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Graphs below this with a description of what the graph is showing
Discussion
Here, we can just explain what went/think went wrong and how we could’ve maybe avoided it if anybody wants to read this for future reference?
Conclusion
Here, we can include our final remarks and what we learned while going through this test
Validity of results
Conclusions
Implications
Some Highlight of Results (quantitative statements)
Trends
More stuff that I can’t think of?