Finding Plate Deflection of 10*10*0.2 cm Composite Plate

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SUMMARY

The discussion focuses on calculating the deflection of a composite plate measuring 10 cm x 10 cm x 0.2 cm made from glass-epoxy under impact testing conditions. The plate experiences an impact from a weight of 24 grams and 57 grams at velocities of 0.6 m/s and 1.2 m/s, respectively, while remaining within the elastic region. The strain in the x-direction has been measured, and additional strain data in the y-direction is available. The discussion emphasizes the need for more information regarding the plate's orientation and coordinate system to accurately determine deflection.

PREREQUISITES
  • Understanding of composite materials, specifically glass-epoxy laminates.
  • Knowledge of strain measurement techniques, including the use of strain gauges.
  • Familiarity with impact testing methodologies and their implications on material behavior.
  • Basic principles of mechanics of materials, particularly in the elastic region.
NEXT STEPS
  • Research the calculation methods for deflection in composite plates using the Euler-Bernoulli beam theory.
  • Learn about the effects of impact velocity on strain and deflection in composite materials.
  • Explore the use of finite element analysis (FEA) software for simulating impact tests on composite structures.
  • Investigate the relationship between strain and stress in composite materials, particularly under dynamic loading conditions.
USEFUL FOR

This discussion is beneficial for mechanical engineers, materials scientists, and students involved in composite material research, particularly those focusing on impact testing and structural analysis.

multipeditalist
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Homework Statement



Dear friendes, I have just measured the strain of a composite plate at it's surface. It was an impact test. I have only epslon x. How can I find the plate defection? Plate size is equal to 10*10*0.2 cm.

Homework Equations





The Attempt at a Solution

 
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One needs to supply more information. For example, what is the orientation of the plate, and what is the coordinate system?

I would expect one is measuring a permanent deformation based on an impact test?
 
Astronuc said:
One needs to supply more information. For example, what is the orientation of the plate, and what is the coordinate system?

I would expect one is measuring a permanent deformation based on an impact test?

Dear Friend, thank you for you reply. The plate is composite material [0 90 0 90 0]s from glass-epoxy. The plate weight is 24 gr (10*10*0.2 cm) and the impactor weight is 24 and 57 gr (large mass impact) with impact velocities: 0.6 and 1.2 m/s (low velocity impact). There is no damage. We are in Elastic region. I can find the strain in y direction too (I have the strain in x direction now). I have attached the strain gauge at the botoom of the plate, below the place that I impacted the plate from top wih a small ball.

Anything else?

Please tell your answrs with naming of the references.

With respect

Faramarz A. Gh.
 

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