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Composites (in general)

Posts regarding composites (in general).

Test

cimini's picture

Test the post service for Composites Design Workshop XIII. Carlov

Lamination factor for plain and twill weave fabrics

Daniel_Retief's picture

When back calculating trace from a woven (twill or plain) fabric test sample, which lamination factor do I divide the test result with to get trace?

Answers provided by John Linck on Challenges and Opportunities

Daniel_Melo's picture

Q.: Can we add "the cutting challenge of Carbon Fiber Laminate"? For example, it is hard to use laser cutting.

YouTube Video - Trace-Based Composites Design

Daniel_Melo's picture

Introduction to trace-based stiffness and strength of laminated composites by Prof. Steve Tsai and Prof. Daniel Melo at Stanford University.
https://www.youtube.com/watch?v=5YadjrRx4YM

Cure modelling software??

Ghulam_Mustafa's picture

Is there any composite cure modelling software available for the participants of CDW?

Mustafa

Multilaminate part

Arnaud_Divialle's picture

Hi all,

I am looking for advice.

I have a part where based on MicMac, I would need two different ply-angle laminates:

Thank you for an excellent and very thought provoking workshop

Alison_McMillan's picture

Dear Steve, Daniel, and all the presenters,

Pultrusion in using open bath

Naresh_Sharma's picture

As a manufacturing company located in Italy, we've been told by the environmental agency here that in a new operation, such as ours, they will not allow/license the manufacture of anything with open access to resin. Therefore, meeting the environmental requirements will far outweigh the costs involved in developing the same process using pultrusion dies with infusion of resin. Additionally, due to new VOC regulations any existing operation using such methods has a limited number of years to cease all high VOC type of activity in area's open to workers.

This points to the answer for ladder manufacture question and the nature of the information shared.

Material Database

David_Rouison's picture

Is there any data available for E-Glass/Unsaturated Polyester (isophthalic) combination to use in MicMac? I have only found E-glass/Epoxy combinations to date. Thanks!

Carbon Frame Tubing Bonding

John_Eggers's picture

In building carbon bicycle frames we use the traditional tube to tube construction method.

Cooking composites as fast as possible: catalytic heaters

Naresh_Sharma's picture

Dear all,

A few years back, I'd done some work regarding faster means of curing of composites for our internal production processes, basically to think of alternative ways to create better aircraft parts without the costs and cycle time of autoclaves. There was something similar to what I was thinking that was being done elsewhere as well. So this is what we found out, catalytic conversion of methane gives energy in the 2-9micron range, which is better than a focused energy at a single frequency that electric/infrared/microwave-generator would give. This spread of energy is suited for curing of composites. This is a very basic youtube video on catalytic heaters.

However, there is a problem, that methane catalytic converters have a hard time in finely controlling the amount of heat. Due to lack of resources and the pre-programming (that we should have a certain curing cycle etc.) we had from our epoxy supplier, we dropped this idea early on, but perhaps it was too early. If one could have a part that moved in between a bank of such catalytic heaters, one could control the absorption of radiation. There are some other ideas that could control that heat. If anyone among you is interested, to independently pursue, perhaps its an idea worth investigating. Or if you've already tried it, it will be great to hear your views.

Thanks,
N

Some interesting links

Naresh_Sharma's picture

Dear all, For those who may be interested. Do a search on a company called Rocky Mountain Composites on the patent server of google. Here is a link of the search today. This company has some of the best patents for aircraft production techniques. They benefited from a project that Toyota funded many years back when Toyota wanted to enter into the general aviation world.

A similar search for Boeing on composites is also available here. Then there is a great patent on VAP by EADS.

Happy reading and hope you get great ideas for your projects.

N

SQRTM

Arnaud_Divialle's picture

Hi,

Here are some details about SQRTM (Same Qualified RTM): http://www.compositesworld.com/articles/sqrtm-enables-net-shape-parts

Basalt fibers

Naresh_Sharma's picture

Dear all,

I wonder if anyone among you have experience with Basalt fibers. What are the material allowables (A or B) that one can use with Basalt?

Thanks

HOMEWORK #6 Error

Keri_Broderick's picture

Getting an error for HW#6 when pulling up SMM+ & MMFatigue:
"This workbook has one or more links which can not be updated

Friday Lecture and final HWs

Keri_Broderick's picture

Is there any way to do what happened yesterday and post a pdf of the lecture presentation and the corresponding HW BEFORE class begins please?

New Group on LinkedIn

Alberto_Bassanese's picture

Dear all,

for those of you who are interested I have just created a group "Multi-Scale and Progressive Damage Analysis of Composites" on Linkedin.

Thanks

Alberto

Curing of dry fibre/wet resin (after hand layup) in autoclave

Laraib's picture

Hi,
Has anyone come across curing of dry fiber/wet resin after hand lay up in autoclave?

Recorded Lectures

ctower's picture

Dear Participants,

The recorded lectures are located under the date they were given in the Workshop 2 download utility on the left hand side of this forum.

You can download the webex player required to play the .wrf files at
http://www.webex.com/downloadplayer.html

Thanks!

Homework Submission

ctower's picture

Dear Participants,

We will be assigning multiple homework sets throughout the workshop. The homework sets assigned during lectures this week (Jan. 8 and 9) will be due next Monday, January 11.

The homework sets assigned during lectures next week (Jan. 11-15) will be due the following Monday, January 18.

You may submit typed solutions or scans of handwritten work, whichever you prefer.

Please compile your work for each homework set into a single file (e.g. YourNameHomework1.doc) and send your solution to:

CDW.Homework@gmail.com

Thanks!

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