donno did i understand ur advice correctly. in my model, there are 3 layers/plane with all different properties but with same dimensions. within each layer/plane, same properties were used throughout. i meshed all 3 planes to the same density. in each of my body constraint, i have 3 nodes which...
Hi Hillbilly,
pardon me for imposing on u again, but seems like u r the only one that i can turn to. Really hope u can reply to my thread...thks.
regarding the method u taught me, i'm kinda facing some problem. using the constraint method, seems like i can't get the model to converge, as in...
thanks once again vonlueke,
just to add on the comment u made on my 2nd method, i tried comparing my model with a calculated answer (formula gotten from J.M.Davis book on Lightweight Sandwich Construction). tried varying the mesh density and my results seemed to tell me that there is an...
sorry hillbilly,
tried out the method and compared with some results calculated from formulae in J.M. Davies' book -'Lightweight sandwich construction'. Seems like there is a optimal mesh density, cos if i use a denser mesh, the displacement became < actual displacement calculated. would a...
thanks so much vonlueke.
those sites are really wonderful.
just wondering if u have used SAP2000 to model sandwich panel before? i'm currently playing around with 2 methods, one is using the equivalent approach and the other one is to directly model the composite panel. Did this by...
thanks very much tstanley,
actually mine is a linear system, so wondering if the axial and bending effects can be uncoupled. since young's modulus of axial and bending effects are different, so will use the respective E's to get axial and bending stress respectively.
will try to look for the...
hi to all experts,
wondering if anyone had experience in modeling a composite material using equivalent approach, which means converting the composite to non-composite. can this approach model all behaviours, i.e. bending, axial behaviours etc, accurately?
thank you very much
Hello....
I'm currently modeling a sandwich panel. However i have started using SAP2000 sometime ago before i realised that it is only for non-composite structures. So now actually thinking of using ABAQUS.
Fortunately with the help of this forum, i managed to get an idea to model a composite...
thank you very much once again,
will try out what u have said and also some other benchmarks to verify this.
regarding the book by Ed Wilson, heard that it is very good too but could not get it from the library in my college. Think the website www.csiberkeley.com only has excerpts of it...
hi Barefoot_hillbilly,
just pondering if, say a pressure load, acting on one surface of the composite panel, is it true that only the first layer (the layer on the side where the load is acting) is resisting the load and not all 3 layers? pls correct me if im wrong, cos constraint only causes...
thanks barefoot_hillbilly
i have tried modeling it with various mesh intensity. for a panel of 1m by 2.15m, i used a 8x8 mesh. the strain calculated at the interface of the sandwich panel still differed by about 50% (but has improved quite a lot compared to a 4x6 mesh initially). Actually did...
thank you very much barefoot_hillbilly,
one more question, u mentioned using rigid body type constraint, which kind of constraint are u recommending, for instance, Equal, Body constraint etc? How to ensure debonding does not occur at other regions of the panel besides the nodes?
really...
thanks for the reply,
could you kindly elaborate on how to link the separate panels one on top of the other? seems to me SAP2000 allow me to specify a shell at one spatial location only (by specifying a shell element by clicking on the grid), pls correct me if i'm wrong.
thank you once...
Hello to all experts out there,
i understand that SAP2000 is a non-composite modeling software. I'm currently trying to model a sandwich panel in SAP2000. To model as a single material panel, i found an equivalent young's modulus using EI (flexural rigidity) so as to model the flexural...
