Another test with the new tensile testing machine

So, I did another test today, just to test the controlling circuits and the software. This time, I put a real time chart on the video. I almost managed to sync it with the video (I recorded the testing and my screen at the same time). I intentionally did not put any units on the axes, because the load cell should be calibrated better and there is no displacement data at this moment.

Since I move the grips with a stepper motor, I could get some approximate displacement based on the number of steps, but because of the stiffness of the whole setup (slackness and/or backlash) it would not be so precise. I will assemble my displacement sensor for the next video. The unit on the y-axis is kg (kilogram) and on the x-axis is ms (milliseconds). So, this is a time-load curve. This sample started to fail after reaching ~340 kg.

The flat part in the beginning of the tensile curve is because of the "self-alignment" of the machine and also, there is a small amount of displacement needed before the sample is being pulled.