Plate mode shape subjected to damage

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SUMMARY

The discussion centers on the effects of damage to a metal plate's mode shapes at frequencies of 100 Hz and 300 Hz. It concludes that cutting a small part of the plate, particularly at the top corner, will alter the mode shapes, with the top antinode being most affected. The frequency at which the mode shape will change more severely is not definitively stated, but the inquiry suggests that both frequencies will experience changes. The original poster (OP) recommends using LISA-8 for analysis, highlighting its effectiveness and cost-free nature.

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  • Understanding of vibration analysis principles
  • Familiarity with mode shapes and frequency response
  • Basic knowledge of finite element analysis (FEA)
  • Experience with LISA-8 software for vibration analysis
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  • Research the impact of structural damage on mode shapes
  • Learn how to perform vibration analysis using LISA-8
  • Explore the finite element modeling capabilities of ANSYS
  • Investigate the relationship between frequency and mode shape alterations
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Mechanical engineers, vibration analysts, and researchers in structural dynamics who are interested in understanding the effects of damage on mode shapes and vibration frequencies.

bulgogii
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Hello Peeps~ I have couple of questions related to vibration and I would really appreciate some help from you experts out there.

Anyways, say I have a metal plate with mode shapes observed at 100 Hz and 300 Hz as shown in the below figures. If I were to chip(cut) off a small part of the plate(top corner), will the mode shape for both frequencies totally change? or will just the top antinode part("mountain shape") will change? which frequency range (100 Hz or 300 Hz) will be more severly changed in general?
upload_2015-9-30_16-24-37.png
upload_2015-9-30_16-25-3.png


Figure 1. at 100 Hz Figure 2. at 300 Hz

This question would of been easy if I had ANSYS but... I wouldn't understand the reasons for the result anyway :(
 
Last edited:
Ah well~ I'll try and find ANSYS user and ask for help~
 
There was no way of answering this properly without doing full analysis on a plate with actual dimensions and constraints .

OP - try using LISA-8 . Excellent and costs nothing .
 

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