×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Determination of composite Lay-Up properties

 Forum Search FAQs Links MVPs

## Determination of composite Lay-Up properties

(OP)
Hi all,

I want to perform fea on composite lay-up using ansys apdl. The frp laminate is consisted of 4 layers of 0.3mm bi-directional frp fabric. The bi-rectional frp is layed-up for different angle at each layer. The arrangement is (0-90-45-135-0-90-45-135). The resin is applied at layer surface. The manufacturer provided properties for single bi-directional frp fabric as been supplied. The mechanical property of the resin also been supplied by manufacturer. How to determined the properties of completed frp laminate ? is it by tensile test ? or possible by using mathematical formulation?.

Thanks

### RE: Determination of composite Lay-Up properties

What properties do you need? You can have stiffness and strength for the laminate in each of the usual directions, which is a total of six numbers (tension & compression in X, Y and XY (shear)); you may also be interested in bending properties (another six). Combinations of these are also possible.

Classical lamination theory is the usual approach for calculations, but is not too accurate for strength (better than nothing, though). It's quite a project to write your own software for CLT (allow a few weeks), but is no great challenge with a good reference, but usually people buy in software or use an FE package (most FE packages have CLT built-in).

If you need accuracy then test is the only way forward (especially for strength, and especially for combinations of loading).

### RE: Determination of composite Lay-Up properties

Google classical lamination theory calculator for a bunch of free CLT options and tutorials.

### RE: Determination of composite Lay-Up properties

(OP)
@RPstress,

Thanks for replying, sorry it is took very long time to reply, but you suggestions really helping me. For testing, which code related the testing of the ply properties?. I looked into ASTM D3039 guideline, it said the test piece should be in constant rectangular cross section, means that in 0-90 fiber direction (as far as i understand). In my work, after applying adhesive for 4 layers fabrics, the fiber direction is 0-90-45-135-0-90-45-135. Is there any specific code for multi angle ply composite? Thanks

### RE: Determination of composite Lay-Up properties

What do you mean by "code"?? Analysis (software) code? Test method?

For the fabric, did the manufacturer provide dry fabric properties? or properties of fabric + resin (composite)?

What properties are you looking to obtain? moduli or strength? tensile? compressive? shear? other? Each will require a different test method. See ASTM D4762 for guidance on test method selection.

SW

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

#### Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!