Ready for Testing

Nicholas A -

Hello everyone, I’ve finished preparing the test specimens and all that’s left to do is the actual tensile testing next week. 

To do a tensile test, the sample is placed in the top and bottom grips of the tensile tester. Then, the machine hydraulically adds force to pull the specimen apart while keeping track of the force and displacement. Once the sample breaks, I will get a graph of the load form the machine versus the position of the machine. Also, I will have data on the strain of the material.

An extensometer, which measures the change in length of the material, is also important for the test. It shows the strain of the material that is needed to calculate the elastic modulus, which is the relationship between how much the material stretches under force. For these fiberglass composites, the amount they stretch before they break is almost unnoticeable because the fibers are stiff. 

Here are some pictures of the process of making the test specimens:

Composite without GO and the four grip tabs

Clamps holding grip tabs while epoxy cures

Composite panel with grip tabs attached

One of each test specimen with GO sample on the left


Next week, I will gather data on the precise dimensions of each test specimen and perform the tensile tests.

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    Looks like you are making a lot of headway with testing! Was it difficult to learn how to use the tensile tester?
    Hi Ms. Bennett, I was surprised by how easy the machine is to operate. I only needed to put the sample in, set up the machine, and run the program. I'll go into more detail in my next post.

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