Hi!
Is there anyone who knows about the consideration of shell neutral axis offset in NASTRAN ?
Especially when modeling honeycomb panel to the frame(beam) with laminated element, there is a offset for neutral axis with respect to the reference curve.
I saw the dummy element with very weak...
Hi guys,
Is there anybody who has a clear idea on the attachment factor of 1.33 in the seat design ?
According to FAR, the factor is required to the attachment of
- seat to the structure
- belt/harness the the seat or the structure
Therefore I understand for example,
- It doesn't have to be...
Hi,
Regarding the compressive failure mode in the bending member such as circular tube, rectangular tube, or hat section,
What is the relationship between the plastic bending theory and the crippling strength ?
If I consider the crippling stregnth as the compressive strength (Fcc < Fcy), it's...
Hi guys,
I am choosing the suitable Glass Fabric product.
I am wondering if there is any criteria regarding the resin
content. As far as I know, roughly 40% is quite standard.
What about 30%? Obviously it can provide better mechanical
properties for stfinness and strength. As far as I know...
Hi !
I am looking at the bearing strength of FRP material in the bolted joint. I am wondering what is the main failure mode for the bearing strength. In metal, it is obviously contact compress stress at the contact area.
In my analysis model using NASTRAN, in-plane shear stress is more...
Hi !
I have a question of rigid element usage of applying load.
Let's suppose I put the rigid cylinder weight onto the wide cantilever beam end, and I applied the side load at the CG causing the torsion on the beam. I have four or eight bolts to fasten the cylinder.
Most of people might use a...
Hi !
In single shear joint, I normally pick up the bending moment arm
with the half of assembled length. I've checked all references, but
I couldn't find a formula of the subject.
I blieve that moment arm is conservative. I need less conservative
but more practical formula especially for...
Hellow!
I have a question about single shear lug joint strength.
If assuming I get the nominal axial strength of a lug, Fa, then
one of my references, German design hand book, says that
Fa* = Ka x Fa x (Sbr / Stu)
where, Fa* = final lug strength of sigle shear lug joint
Ka =...
Hi guys!
Anybody who let me know the modeling way using CSHEAR element? As u know, spar web can be modeled with that element very often for simplicity based on conservatism in aerospace industry. I tried it comparing with the other elements, membrane and plate, but I got a strange result for...
