Moment of Inertia: Check My Calcs for Iy

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SUMMARY

The discussion focuses on the calculation of the moment of inertia (MOI) for a triangular shape using Autodesk Inventor. The user confirmed that their centroids and areas were accurate but suspected errors in their MOI calculations, particularly for the triangle. They questioned whether the moment of inertia should be calculated about the tip of the triangle or the centroid of the entire figure. Ultimately, the user calculated the MOI of the triangle as \(\frac{1}{36}\), indicating a need for clarification on the correct reference point for the calculation.

PREREQUISITES
  • Understanding of moment of inertia (MOI) concepts
  • Familiarity with centroids and area calculations
  • Proficiency in using Autodesk Inventor software
  • Knowledge of geometric shapes, specifically triangles
NEXT STEPS
  • Research the calculation of moment of inertia for composite shapes
  • Learn about the parallel axis theorem in relation to MOI
  • Explore Autodesk Inventor's tools for verifying MOI calculations
  • Study the differences between calculating MOI about different reference points
USEFUL FOR

Engineering students, mechanical designers, and anyone involved in structural analysis or CAD modeling who needs to understand moment of inertia calculations.

aaronfue
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Homework Statement


I was wanting to see if someone could check my calculations. I've checked out the Iy and Ix in Autodesk Inventor and what I got is wrong.

Here are the links to my images. I apologize, the uploading option is not allowing me to upload the pictures.

http://postimage.org/image/re825r20b/
http://postimage.org/image/vomq1c73f/
http://postimage.org/image/lkdgw1dyv/

Homework Equations



I believe the only one that is wrong is the triangle?

My centroids were all correct, including my areas. So I'm sure my calculations for MOI's are wrong somewhere.
 
Last edited:
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The MOI of the triangle is wrong.
Are you supposed to calculate Iy about the tip of the triangle or about the centroid of the entire figure?
 
SteamKing said:
The MOI of the triangle is wrong.
Are you supposed to calculate Iy about the tip of the triangle or about the centroid of the entire figure?

I was supposed to calculate Iy of the entire figure, but still wanted to calculate each shape. I was able to get the MOI of the triangle: [itex]\frac{1}{36}[/itex]
 

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