Test Results: Composite Panel Deflection & Stiffness

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In summary, the conversation discusses the testing and calculation of stiffness and deflection for a composite panel. The speaker encountered different results when using hand equations and is unsure which deflection value to use in calculating stiffness. They are seeking advice on what they may be missing and how others have determined their stiffness values. Additionally, the speaker wonders if the theoretical background they used accounted for the panel's properties, particularly if it is a complex lamina or laminate with orthotropic layers.
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har_rai
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Hi:

Recentlly we tested a composite panel for uniform pressure load and tablulated the deflection at few location where we were intersted.But when I tried to use hand equations to calculate the stiffness/deflection and I got totally diffefrent results for deflection.Actually deflections are more in hand eqations.

Now am I wondering which deflection to use to calculate stiffness.

If I use from hand results, stiffness (total load from pressure /deflection)is not acceptable because sfiffness is small than required.

Can anyone tell what I am missing?

Thanks in adwanse.
 
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  • #2
How did you come up with your values of stiffness and so? Was thinking whether the theoretical background you utilized is able to take account the properties of your panel, in case it's a more complex lamina/laminate (several layers which are orthotropic for example).
 

1. What is the purpose of conducting tests on composite panel deflection and stiffness?

The purpose of conducting tests on composite panel deflection and stiffness is to determine the structural integrity and performance of the panel. This information is important in various industries such as construction, aerospace, and automotive, where composite panels are commonly used.

2. How are tests for composite panel deflection and stiffness conducted?

Tests for composite panel deflection and stiffness are typically conducted using specialized equipment such as a universal testing machine. The panel is subjected to a controlled load and the resulting deflection is measured. Multiple tests are performed at varying loads to determine the stiffness of the panel.

3. What factors can affect the deflection and stiffness of a composite panel?

The deflection and stiffness of a composite panel can be affected by various factors, including the type and quality of materials used, the design and construction of the panel, and the environmental conditions in which the panel will be used. Temperature, humidity, and exposure to chemicals can also impact the performance of the panel.

4. What are the acceptable levels of deflection and stiffness for a composite panel?

The acceptable levels of deflection and stiffness for a composite panel vary depending on the specific application and industry standards. In general, a lower deflection and higher stiffness are desired for optimal performance and structural integrity. Acceptance criteria for deflection and stiffness can also be determined through comparative testing with other similar panels.

5. Can the results of tests on composite panel deflection and stiffness be used to predict the performance of the panel in real-world applications?

Yes, the results of tests on composite panel deflection and stiffness can be used to predict the performance of the panel in real-world applications. However, it is important to note that there may be differences in the actual performance due to factors such as installation, environmental conditions, and other variables. Therefore, it is recommended to conduct periodic tests to ensure the continued performance of the panel.

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