phenolic sandwich panels
phenolic sandwich panels
(OP)
Hi Guys,
Im after some help. Im have some problems with some glass phenolic sandwich panels. they seem to be buckling. Any solutions?
Im working off an aluminium mould, applying two plies of phenolic, curing then applying 19mm honeycomb core and a further two plies of phenolic. A pressure plate is applied before bagging. The weave of the glass phenolic is a satin weave 8 harness. There is also an airex border internally along with some aluminium inserts. The panels themselves are around 2 metres long by 1 metre wide.The amount of buckle seems to vary with every panel.
This is causing me some concern so any help would be much appreciated.
I look forward to hearing from you.
Im after some help. Im have some problems with some glass phenolic sandwich panels. they seem to be buckling. Any solutions?
Im working off an aluminium mould, applying two plies of phenolic, curing then applying 19mm honeycomb core and a further two plies of phenolic. A pressure plate is applied before bagging. The weave of the glass phenolic is a satin weave 8 harness. There is also an airex border internally along with some aluminium inserts. The panels themselves are around 2 metres long by 1 metre wide.The amount of buckle seems to vary with every panel.
This is causing me some concern so any help would be much appreciated.
I look forward to hearing from you.





RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
The fabric weave is unbalanced. Are you using a balanced layup (e.g, warp face to warp face in each skin or warp face toward core in each skin)? Weave misalignment in the prepreg can also cause this,and is a very common problem. Check that the warp and fill yarns are straight and square with each other. Is the prepreg tacky or dry and boardy? Tacky prepreg can be difficult to lay down flat, without waves and bags. Pressing these flat will misalign the fabric.
Do you have a good release layer between the mold and and part? The CTE does not match so things will want tomove with temperature changes. Is the mold stiff enough to stay flat under stress?
Resin content of the two face sheets may be different due to variations in the prepreg or due to resin bleed into the core which flows to the lower surface. More resin means more shrinkage.
Phenolic releases water during cure which dries out later. Drying results in shrinkage.
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels
RE: phenolic sandwich panels