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Hi; I want to know how can i find the initial shape of a deformed structure. I have a filament wound pressure vessel and i know that the optimum shape(after deformation) for the dome is a geodesic dome so i want to know the undeformed shape which produces that geodesic shape after loading with...

Thanks a lot for your consideration.The values i mentioned are based on this book: Hyer M.W.,"Stress Analysis of Fiber Reinforced Composite Materials"McGrawHill 2001 perhaps these are for another kind of carbon/epoxy. but i want to know how did you guess Ez and other formula,where are they...

I am analysing a 3d composite(carbon/epoxy) pressure vessel with ansys using shell99 elements and i want to obtain tsai-wu failure criterian.I have only these properties:(1,2 or x,y are in plane 3 or z is out of plane) MODULUS: E1,E2,G12 STRENGHT: Xt,Xc,Yt,Yc,S POISON RATIO:NU12 but there are...

I used shell elements(shell 99 which is Linear Layered Structural Shell)and i mentioned that in ansys manual The Tsai-Wu failure criteria used are 3-D versions of the failure criterion .so strenghts in all directions(x,y,z,xy,xz,yz)are required. your questions: 1-carbon fibers are TC-42 from...

Is there any standard for opening and flange dimension of a composite pressure vessel with nonmetalic liner. Cheers alleak

I am analysing a 3d composite(carbon/epoxy) pressure vessel with ansys and i want to obtain tsai-wu failure criterian.I have only these properties:(1,2 or x,y are in plane 3 or z is out of plane) MODULUS: E1,E2,G12 STRENGHT: Xt,Xc,Yt,Yc,S POISON RATIO:NU12 but there are more properties required...

I am analysing a 3d composite(carbon/epoxy) pressure vessel with ansys and i want to obtain tsai-wu failure criterian.I have only these properties:(1,2 or x,y are in plane 3 or z is out of plane) MODULUS: E1,E2,G12 STRENGHT: Xt,Xc,Yt,Yc,S POISON RATIO:NU12 but there are more properties required...

In an optimization procedure angle and thickness are design variables and i want to know how accurate should i be. Cheers alleak

I am analysing a 3d composite(carbon/epoxy) pressure vessel and i want to obtain tsai-wu failure criterian.I have only these properties:(1,2 or x,y are in plane 3 or z is out of plane) MODULUS: E1,E2,G12 STRENGHT: Xt,Xc,Yt,Yc,S POISON RATIO:NU12 but there are more properties required by ansys,if...

Hi SWComposites ; It is necessary at least to enter Ez & Strenght in Z direction and it is sufficient to enter other modulus and strenghts relating to z direction. Cheers alleak

Hi SWComposites ; Is there any refrence for your answer.Is there any website. Cheers alleak

In filament wound structures such as pressure vessels what is the accuracy of layers thickness and fiber angles.for example can we say alayer is 1.1 mm thick and the fiber angle is 9.1 degrree or can we be more accurate like 1.11 and 9.12. Cheers alleak

For an ansys analysis i need to know z direction(out of plane)material properties of on filament wound carbon/epoxy composite.but in handbooks i saw only the properties in x,y&xy directions.how can i have these properties.any help would be appreciated. Cheers alleak

Hi; I am analysing a 3D composite pressure vessel with ansys.I use shell 99 elements and want to know max. tsai-wu failure criterian.for material properties i have seen composite handbooks and there is only properties in directon 1,2 and 1-2 but there is not anything mentioned for direction 3.It...

I want to know how can i use ansys as a simulation tool for an external optimizer like matlab,a C program or anything else.can i use external optimizer inside ansys via user-defined optimization method.any help would be appreciated. Cheers alleak

I want to know how can i call one FEM(like ansys)software from Matlab(optimization toolbar) and how can i make inputs and outputs beetween these two(making a loop until reaching the optimum result) Cheers alleak

Hi; I am working on optimizaton of composite pressure vessels and currently on the stacking sequence optimization.I have two design variables(fiber angle & layer thickness)and I want to optimize the weight.I prefer to use genetic algorithm for optimization and ansys for simulation.I am seeking a...

I still have a keen interest in working in this area and would like to learn more about what others are doing. Are there samples of your work that can be shared? If there are other resources you can point me to would be appreciated. Cheers alleak

so what is the difference beetween high density polyethylene and polyethylene Cheers alleak

Hi; I am working on optimizaton of composite pressure vessels and currently on the stacking sequence optimization.I have two design variables(fiber angle & layer thickness)and I want to optimize the weight.I prefer to use genetic algorithm for optimization and ansys for simulation.I am seeking a...