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Re: Simulation study on 2x4 lumber just for practice using simulation module.....(to see how much can be applied before it breaks)
John Stoltzfus Dec 29, 2017 11:08 AM (in response to Dave Krum)Dave Krum - what version are you running?
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Re: Simulation study on 2x4 lumber just for practice using simulation module.....(to see how much can be applied before it breaks)
Dave Krum Dec 29, 2017 11:38 AM (in response to John Stoltzfus)Hi John,
Still on SW2015. Solid for me.
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Re: Simulation study on 2x4 lumber just for practice using simulation module.....(to see how much can be applied before it breaks)
John Stoltzfus Dec 29, 2017 11:42 AM (in response to Dave Krum)I don't have an answer for you, the reason I asked is - it's always best to list the version you're using when it comes to something like this, maybe the information you get back is from guy's using 2018 and it don't help you at all. or there maybe a special fix for your version... etc.
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Re: Simulation study on 2x4 lumber just for practice using simulation module.....(to see how much can be applied before it breaks)
Matt Peneguy Dec 29, 2017 11:40 AM (in response to Dave Krum)Generally 2x4s are made of pine. I think it is Ponderosa Pine, but don't quote me on that. Also remember the fiber direction makes a huge difference in the property (wood is anisotropic, steel is isotropic). So, make sure you choose the correct modulus.
A quick web search turned up this resource:
http://www.conradlumberco.com/pdfs/ch4-Mechanical-Properties-of-Wood.pdf
I haven't looked through it completely and verified that resource. But, it looks pretty legit to me.
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Re: Simulation study on 2x4 lumber just for practice using simulation module.....(to see how much can be applied before it breaks)
Dave Krum Dec 29, 2017 11:43 AM (in response to Matt Peneguy)Hello Matt,
Thanks for the heads up. I'll take a look
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Re: Simulation study on 2x4 lumber just for practice using simulation module.....(to see how much can be applied before it breaks)
Dave Krum Dec 29, 2017 12:02 PM (in response to Matt Peneguy)Thanks! I sure will. Happy New Year to you.
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Re: Simulation study on 2x4 lumber just for practice using simulation module.....(to see how much can be applied before it breaks)
J. Mather Jan 2, 2018 9:10 AM (in response to Dave Krum)...the math formulas for the handwritten workup
... thought it would be cool to see how much weight I could apply to the center of a standard 2x4 oriented the strong way before it breaks.
What are the limitations of a linear static stress analysis?
1. The math is appropriate within the linear portion of the stress/strain curve. (Break (fracture) might occur well past the linear portion of the curve.)
2. Istropic material properties. (Wood is not isotropic.)
3. Relatively small displacements. (Relative is, well, relative.)
4. More reliable if the aspect ratio between width, depth and height is not too great (another relative term). (Take a veneer strip of that material and you can bend into a loop. Now you do not have an aspect ratio that extreme, but you have a pretty long, skinny part.)
Use caution with your analysis.
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Re: Simulation study on 2x4 lumber just for practice using simulation module.....(to see how much can be applied before it breaks)
Dave Krum Dec 29, 2017 2:24 PM (in response to J. Mather)Hi. Not building anything really. More of a curiosity thing just to get a flavor for simple simulation practice (but maybe not that simple since the wood isn't isotropic as you guys mentioned). Sorry if sounding ignorant.
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Re: Simulation study on 2x4 lumber just for practice using simulation module.....(to see how much can be applied before it breaks)
J. Mather Dec 29, 2017 3:06 PM (in response to Dave Krum)Dave Krum wrote:
... (but maybe not that simple since the wood isn't isotropic as you guys mentioned).
Doesn't matter if it was isotropic.
SolidWorks linear static analysis does not calculate fracture. So even if it was steel, you are not going to calculate (with that analysis) when it breaks.
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