Glassfibre and plywood properties

[ferro1001]

Hello,

I have to model some parts of a structure with plywood and glassfibre, anybody knows what their properties are? How can I do it in ABAQUS?

Thanks in advance

 

[cedro]

Glassfibre: isotropic, linear elastic - brittle failure. Fails at about 1-2% elongation (depends on quality). E-modulus is 72 GPa and Poisson ratio 0.22.

Plywood properties are for sure dependent on degree of moisture, would, orientation of layers etc. Anything between 20-40 GPa in E-modulus for a quasi-isotropic laminate should be possible. Can you get testdata?

"model some parts of a structure with plywood and glassfibre" is a very loose description of your material...

 

[ferro1001]

Thank you Cedro,

My structure is a part of a bus, I am doing an impact essay in dynamic explicit. The glassfibre part is an inner curved shell touching the ceiling with 1 milimeter of thickness, the plywood part is the floor of the bus where people walk to the seats.

By the way, I need density too for the dynamic model, do u know their densities too?

Lots of thanks

Ferro

 

[cedro]

Density of glass is 2.6 g/cm3. By the way it sounds from your description (1 mm ceiling) that it is not really glass fiber but a composite: plastic-glassfiber. Then you first of all need the ammount of glass fiber and type of plastic to say something about material properties.

Plywood density is about 1 g/cm3, floats if not too much phenolic resin. By the way I believe now i overestimated the E-modulus of plywood, should be more like 10-12 GPa at 23 degrees C and 50% RH. For ex birch wood is 12 GPa.

 

[ferro1001]

Thank you very much Cedro,

Sorry, it´s my fault, the glassfibre is a shell of 2 mm of thickness in the OUTER ceiling, in the inner ceiling there is a curved shell of plywood of 6 mm of thickness. The glassfibre curved shells are divided in 2 parts of 1.5 m and 1 m length and about 12,5 m of curvature. Both of them are about 2 m wide; they are some kind of stiffners for the ceiling main structure. I don´t know what kind of glassfiber (or plywood)is, I´ll have to choose the most suitable for my model.

 

[cedro]

hmmm. I still dont understand how you can make a shell of glassfibers without a matrix of some kind. Note that I have given FIBER DATA, not data for a plate with distributed fibers - it is not possible to have 100 volume-% fibers in a shell. If you apply my data directly it will correspond to a window glass.

 

[ferro1001]

Hi,

Sorry, of course it is a matrix of resin and glassfiber.
I need the properties of the resin (density, Young´s modulus and Poisson´s ratio) with glassfibers, one which is suitable for my model.

Thanks again

ferro1001

 

[ferro1001]

Hi,

I have found an ineteresting web page in order to calculate the density of composite of resin with glass fiber:

http://experts.about.com/q/2430/3567225.htm