Recent content by makamo66

Thank you, Dale, that is a useful insight. I will have to account for that.

I can't even use the Kirchhoff thin plate theory by itself anyway because the breaking boards are borderline moderately thick plates not thin ones. For example, a google search for wooden boards to break in karate shows boards with the dimensions: 6" x 12" x 0.5" so the ratio of the thickness...

I was hoping I would only need to calculate for small deflections because at first glance, the calculations for large deflections look a lot more complicated and I haven't been able to understand them yet. They involve non-linear equations that have to solved numerically.

There are no consequences, I'm just making a model. But I would like it to be accurate and 20% error sounds like a lot to me.

I found this source https://www.academia.edu/36316365/Chapter_13_Flat_Plates which had a more generous definition of a small deflection than the book by Szilard. For this paper, the deflection is less than half of the plate thickness. With a thickness t of 18 mm over a maximum deflection w_max...

It doesn't seem to be fixed at the edges, it looks like it can move around at the connection points on both edges of the plank

Maybe I just need a source with a thicker board so that the deflection decreases as described here: A thicker wooden breaking board will generally require a greater force to achieve the same amount of deflection as a thinner board, and will also exhibit less deflection under the same force. This...

Maybe I can find a different source for the board deflection required to break wood other than Richard Burr

I've attached the capitol about small deflection theory

I was so happy that the deflections are small because that means I don't have to use nonlinear equations but then I looked at the book "Theories and Applications of Plate Analysis" by Rudolph Szilard the capital with the title "Classical Small Deflection Theory of Thin Plates" and one of the...

Here's a picture

I want to get the boundary conditions for a board held at two edges by participants.

I made a PDF of just chapter 1.7 and attached it

The problem is that I have a book by Ugural that I attached and he only has the options of simply supported, free, sliding, and clamped/built-in for the boundary conditions of the edges of a plate. He discusses these in Chapter 1.7 that has the title Boundary Conditions. I need a boundary...

Thanks for the video. Now I'm wondering what the reason is that the eggs at the fulcrum didn't break.