Is there a difference of properties between 600GM E-Glass Woven fiber and 300GSM E-Glass Woven fiber? The properties of interest are E1,E2,E3,Nu12,Nu23,G12,G13 and G23 of the Composite of WOVEN FABRIC and Polyester Resin.
can anyone kindly state there formulas to…
Uzair, what are you trying to make? I’ve watched your other threads and have been curious.
Moved to engineering talk due to the highly technical nature.
The fabric itself won’t have different properties. However the final composite may have differing properties due to the “nesting”/compaction of fibers in the final composite.
I performed research using identical unidirectional and bidirectional fibers and one thing for certain was that even with identical fibers and matrix their strength properties were vastly different.
Im making a Kayak from composite materials. The materials that i have chosen due to local availability are woven E Glass Fiber and Polyester resin. The constrain is the mass of the kayak which has to be under 15kg and it has to be made with woven fiber. The only type of E GLass locally available here are 600 GSM and 300GSM… For properties calculation i ve used the equations available in the attached document. Kindly help me as this is project is essential for my graduation. 
Thanx
Uzair,
the values in Table 2 ,as first guess and lacking of tests data, are reasonable for that type of laminate, maybe the poisson ratio 12 seems to be a little higher for a woven fabric ( typically in the range of 0.07-0.1 for plain/twill2x2 styles…, while in 13 and 23 planes the values tend to be little higher the UD values ); the mass constraints with glass fiber of areal density available are quite stringent, but it depends by the design and layup that you will use ( don’t forget a reasonable safety factor…). Moreover the design ( then the weight) will be driven by the final use of the kayak ( flat lakes :), fast rivers with rocks and possibility to hit an obstacle :eek: , etc…)
About the areal density: fixed the thickness of a laminate, generally, the thinner the plies and more resistant to delamination is the laminate ( due to homogeneization of the plies), even if 300 gsm is still in the “heavy/thick” side (…but being the only available…).
Note: is a good practice to specify every detail of the laminate constituents, in order to know exactly, which information is worth to be searched…:)…therefore “ woven fabric properties” has little meaning if you don’t specify the style you are referring to……for example: from a structural viewpoint a plain weave is not the same of an 8 harness satin weave, even if they are both made with the best carbon fiber of the planet
Im trying to vary the volume fraction and see it’s effect on the properties of the lamina.The properties are E1,E2,E3,Nu12,Nu23,G12,G13 and G23 of the Composite of WOVEN FABRIC and Polyester Resin. The fabric available is Plain Weave.The mold for the fabrication is available, so the Kayak will be almost of the same dimensions as those of the mold.
Do the areal weight and the weave type effect the properties significantly ???I mean are there separate relations (for the properties) for the composite for each type of weave pattern ???
Im planning on using ABAQUS(6.10) for the composite layup and it asks for the above mentioned properties of the Lamina.
How can you deduce the lamina mechanical E1,E2,G12,etc…properties by simply playing with volume fraction ? You need to test samples, mathematics doesn’t help in this.
There are not different relation for different styles and areal weight; relations account for an ideal laminate where all properties of a particular fabric (plain,twill,etc…)are smeared on each layer.
What relation cannot account for, is the real behavior of al laminate ( here only tests can help you…) which depends by the type of reinforcement (weight,style) and ply angles. A laminate of UD is stronger (in tension/compression e.g.) than a laminate with same fiber volume fraction, same material, but made with plain at 0/90 ( therefore with half fibers aligned with load at 0 deg like UD…); weave pattern plays its role in the premature failure of the plain but only a test can show you, not mathematics.
In your analysis be conservative at the beginning; use the values reported in your document with adequate safety factor, run the analysis, built the kayak, load it , compare your test with your analysis………and, at the end , believe to the test !!!
Don’t forget to show us your kayak, when finished…
Sure thanx alot man…you are a saviour
In my experience I can get a higher Vf with multiple lighter layers of woven fiber than fewer heavier layers. The only way to make a fabric heavier is to push the yarn closer together (increase thread count) or make the yarn bundle larger. Making the yarn bundle larger increases the magnitude of the crimp which typically reduces the Vf. Also weave patters like 8HS end up being thinner because the crimp of the fiber is reduced. This also can potentially increase the Vf.
Fabrics with a high magnitude of crimp can also have slightly less stiffness and strength. As tension or compression is applied to the laminate the fibers try to straighten or buckle. This usually increases the stress within the matrix/resin.
Hi, is this kayak finished, did it went well?
sorry for the late reply…i was working in a very remote area…yes the Kayak was completed and the material optimization we were trying was a successful experiment. Thank you all for your support and help
This is the final report of my project…i hope it would be helpful for anyone who check’s into compositescentral.com searching for guidelines in this specific field.
Thanks for the write-up! I may pick your brain about your abaqus simulation in the near future if you don’t mind. I messed around with the composite modeling in abaqus for my senior design project and it ended up not working very well for me.