- #1
Junkwisch
- 31
- 0
Hey guy, I would like to ask a few question about force and free body diagram.
First question, I conduct a compressive experiment a few day back, using compression machine to test the strength of different materials e.g., Aluminium, PVC and Ceramic. However there is one thing that I don't under stand in regards to this experiment. When the machine start working, the stress and strain graph somehow start up with a very shallow gradient instead of a straight linear gradient which one would expected for the elastic region (modulus of elasticity). This shallow gradient exists for all three experiments. I asked my lab adviser, which he hold me that this is normal. However, it still stuck me about where this shallow gradient come from... can anyone give me a clue for its existence.
The second question has something to do with a question I found on a textbook in regards to drawing a free body diagram. I'm a newbie at this and I'm not certain whether this is the right way to draw it. Can anyone give me a head up. (The question and my work out is in attach files)
Best Regards
Junkswischen
First question, I conduct a compressive experiment a few day back, using compression machine to test the strength of different materials e.g., Aluminium, PVC and Ceramic. However there is one thing that I don't under stand in regards to this experiment. When the machine start working, the stress and strain graph somehow start up with a very shallow gradient instead of a straight linear gradient which one would expected for the elastic region (modulus of elasticity). This shallow gradient exists for all three experiments. I asked my lab adviser, which he hold me that this is normal. However, it still stuck me about where this shallow gradient come from... can anyone give me a clue for its existence.
The second question has something to do with a question I found on a textbook in regards to drawing a free body diagram. I'm a newbie at this and I'm not certain whether this is the right way to draw it. Can anyone give me a head up. (The question and my work out is in attach files)
Best Regards
Junkswischen