suitable Face for my core of the sandwich
suitable Face for my core of the sandwich
(OP)
Hi All,
I have to do a four point flexural test for sandwich
I have to find a suitable Face for my core of the sandwich.
I am to choose one of these three choices:
first selection: 2 layers 0°/0°
second choice: 2 layers 0°/90°
third choice: 2 layers -45°/45°
I am for first choice(0°/0°), because Faces can only be loaded under normal stress!
am I right?
I have to do a four point flexural test for sandwich
I have to find a suitable Face for my core of the sandwich.
I am to choose one of these three choices:
first selection: 2 layers 0°/0°
second choice: 2 layers 0°/90°
third choice: 2 layers -45°/45°
I am for first choice(0°/0°), because Faces can only be loaded under normal stress!
am I right?





RE: suitable Face for my core of the sandwich
Your query about facings being loaded under normal stress makes little sense to me; yes, the facings are under only longitudinal load. The loads across the facings are purely from Poisson's effects.
RE: suitable Face for my core of the sandwich
we do this test to measure deflection and bending strength of sandwich.
my material is not woven, but is a UD-fabric (I don't know what it is called in English, see Attachement).
how will it look like when I work withClassical Lamination Theory and calculate modulus of elasticity(E1) for each face layer?
thank you again for your Help and Time
RE: suitable Face for my core of the sandwich
UD stands for UniDirectional This is a fabric where the majority of the threads run in one direction.
B.E.
You are judged not by what you know, but by what you can do.
RE: suitable Face for my core of the sandwich
I would say that choice one or two would work but I would go with 0/90 because all zeros tend to split very easily and this could introduce an unexpected failure mode.
RE: suitable Face for my core of the sandwich
RE: suitable Face for my core of the sandwich
Your advice was correct.
I did the experiments yesterday.
I have produced all variants, 0°/0° is the best variant
45°/+45° is the weakest.