Best Way To Perform Stress Analysis On Wood?

[ThePieMonster]

I have a stack of 2x4's that are of Wood (Oak) material. I constrained the items together using the typical constrain process in  Inventor 2024. Went into the Stress Analysis Environment and created two fixed constraints on the bottom face of the bottom two 2x4's and then added some loads to the middle 2x4 and a bit of load to two more 2x4s as shown in the below image.

As you can see, a piece of wood is not going to bend like we see below. Also there would be more of a dispersed load and not a direct point like what is shown in the stress analysis view. I have a picture of the real thing at the bottom of this post and ultimately that is what I am trying to re-create. 

Can anyone offer any suggestions on how to create a more life-like analysis? 

Real life wheel crib

I also included the project file below. You will most likely need Inventor 2024 to open it however. 

[JDMather]

@ThePieMonster 

Wood is not an isotropic material (material properties the same in all directions) because of the layered growth wood grain.  Also, linear elastic stress analysis does not analyze for fracture - what is it that you want to know about this design?

Anyhow, Fix face the contact patch(es) of the tire.

Apply the force at the wheel location patches (I did not look at your file).

Similar problem - the important stuff for your issue starts around 9 minutes...

https://www.youtube.com/watch?v=gHOAz8TMam0&list=PLp5izJt_zvN0KUccGh5OrgbNTZ_c4vYxs&index=24

[ThePieMonster]

Thanks @JDMather 

Is the Adjusted x1 two times greater than what would be shown in real life (AKA "Actual") when viewing the simulation outcome? I'm not to sure on what the usage of Adjusted is or the reasons behind using these different view features.

I saw the video and I see why you would want to constrain the top part of your car jack that the car sits on so it could bow out the sides of the sheet metal.

In this case, the wood would end up snapping of course, and I am trying to determine how much weight this could support before failing was the idea behind this test design. 

ADJUSTED x1

ACTUAL

[Frederick_Law]

All those wood and only one piece taking the load.

[swalton]

The basic FEA included in Inventor is limited to problems that fit into its basic assumptions.  See: https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Stress-analysis-as...

In general, wood does not fit into those assumptions.

Robot Structural Analysis might be a better match for the physics/material science of the problem.

https://help.autodesk.com/view/RSAPRO/2023/ENU/?guid=GUID-6E2262BF-610E-421A-A342-33D7BE012925

Inventor Nastran may also be a good match for the physics/material science of the problem.  

[johnsonshiue]

Hi! I believe NASTRAN can handle non-isotropic cases better.

Many thanks!