How can we explain the decrease of tensile strength and modulus but increase in flexural strength and flex modulus for CFRP/GFRP/PolyEster composite

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Is There Any Feasible Method To Test Fluorescent Compounds Other Than Fluorescence Spectrometers ??

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Manish Kumar Lila

Kindly check the compressive strength also, if possible. As Flexural properties are a combination of tensile as well as compressive properties (below and above the neutral plane respectively). This can surely help in explaining the same.

Yehia A. Khulief

I guess this observation may be attributed to the resin. For polyester resin, which are classified into flexible, semirigid, and rigid resins, in general, rigid resin is used, which normally suffer degradation in ultraviolet light. Yet, one needs to look carefully into the composite structure and the type of test made.

You may wish to read how such elastic constants are related. Attached is a link for a good book on this and related issues. Download from my link:

https://www.dropbox.com/s/i1o3iewq35zazgy/Composite%20Materials%20Mechanical%20Behavior%20and%20Structural%20Analysis-%281999%29.pdf?dl=0