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Composite Materials/Questions

SubjectDate AskedExpert
control of environment4/29/2016andy mackay
  Q: In which instances is the control of temperature, moisture or different emissions important and ...
  A: it is important to keep raw materials dry,, this includes resins, dry cloths, pre-pregs and cores. ...
High temperature properties of composites12/15/2015andy mackay
  Q: It is observed that composites materials properties vary with temperature. Ultem filled 50% with ...
  A: I'm not familiar with ULTEM sorry but understand it is a thermoplastic PEI-type material. ...
Military fabric and resin cups and plates7/24/2015andy mackay
  Q: Good afternoon! When I was a small child, I seem to remember seeing cups and plates my uncles ...
  A: I haven't seen these items myself, but imagine the mould is coated in resin first, then cord laid ...
tube with ultrathin walls4/4/2015andy mackay
  Q: Looking for possibility to produce tube length 35 mm ,OD 2.7 mm ,ID 2.5 mm . Ability to handle axial ...
  A: 0.1mm wall thickess is pretty slim all right! This equates to a single layer of 300gm/sqm e-glass ...
Recycled Polyester6/13/2014andy mackay
  Q: I recently purchased a reading pillow that is stuffed with polyester fibers made from recycled ...
  A: there should be no volatile organic compounds in polyester pillow flock, but it is possible to be ...
weight fraction5/6/2014Ever Barbero
  Q: sir, I am frabricated specimens of coir and epoxy with hand lay up method ,as per 30:70,40:60,50:50 ...
  A: If you search my archived responses in this site you will find the answer because I have responded ...
modeling short-fiber composite materials3/3/2014Ever Barbero
  Q: Barbero, I have a very basic question if you don't mind. I would like to know whether it is ...
  A: I am a bit out of my comfort zone with this question because I never attempted to do what you want ...
SMA hybrid composite12/30/2013Ever Barbero
  Q: Sir, I want to study about the Shape memory alloy hybrid composites and its modelling in FEM. I want ...
  A: You need to understand composites before you can do novel work on SMA composites. ...
hybridization of composite7/25/2013andy mackay
  Q: this is vasant doing project on "coir & rice husk reinforced vinylester base hybrid composite ...
  A: in most composite matrices, it is the fibre carrying the majority of tensile loading. you could try ...
rudder/keel ?6/2/2013andy mackay
  Q: Can you explain the construction of the boat to keel, and rudder?
  A: on pleasure craft, rudders are usually made of a fibre glass skin over a foam core, which in turn is ...
Composite Modelling5/21/2013Ever Barbero
  Q: I've read your paper on determination of material parameters for Abaqus progressive damage analysis ...
  A: Your doubts are explained in great detail in this book: ...
fabricatio of coir composite5/8/2013andy mackay
  Q: I have problem in fabricating COIR COMPOSITE with VINYLESTER as a resin...I am using weight fraction ...
  A: So to get 10% fibre fraction, thats 90 grams of resin to 10 grams of fibre. To get 20% fibre ...
Safety factor for composite structures5/6/2013Ever Barbero
  Q: I am a master student in the field of mechanical engineering. I have a project which requires me to ...
  A: This is a complex question, if I want to answer it in detail. To begin, if you do Nastran on ...
astm test dimensions i want know4/30/2013Ever Barbero
  Q: sir,i m doing project on RICE HUSK FLOUR reinforced VINYLESTER base POLYMER COMPOSITE. i know how to ...
  A: ASTM D3039 and D790, both tell you what speciemn dimension you must use. This is assuming that the ...
Wooden stacking chair design4/7/2013andy mackay
  Q: I am a student studying final year product design at Brunel Universiy, London. I am designing a ...
  A: From what I do understand, I'm guessing you're going to bend the front legs to support the chair, ...
weight fraction2/17/2013andy mackay
  Q: ..i want to put increasing weight percentage of coir to check where exactly is it shows optimum ...
  A: Please refer to link below; http://composite.about.com/library/glossary/f/bldef-f2200.htm If your ...
Kevlar tape fraying2/14/2013andy mackay
  Q: how can we stop the edges from fraying, we are using this on the edge of a reflector liner/light ...
  A: Couple of suggestions; You can make the shield/liner so that the kevlar stops before the part edge, ...
infusion of carbon fiber FVF adjustment11/25/2012andy mackay
  Q: I am attempting to fabricate a cosmetic near perfect carbon fiber part with that carbon under glass ...
  A: I'm surprised you're using polyester resin for the process - it typically does not bond well with ...
Composite technology11/22/2012andy mackay
  Q: my name is moohan and i'm living in iran i have a small workshop about fiber glass composite. i ...
  A: Moulding techniques are; Wet layup (dry glass, apply wet resin layer upon layer and wet out) ...
glass fiber rope properties11/5/2012andy mackay
  Q: I want to know about the mechanical properties of fiber glass rope, specially its modulus of ...
  A: I need a little more information about the fibre itself - is it in raw state, how many ends and ...
Carbon Fibre7/15/2012andy mackay
  Q: I need to the answers to some very hard questions that I have been searching on the internet for ...
  A: Brief answer as below, Environmental issues relate to manufacture (feedstocks and process), usage ...
Composite materials for commercial aircraft6/8/2012andy mackay
  Q: I stumble upon this website as I was searching for the type of composite materials used in Airbus ...
  A: CFRP = Carbon Fibre reinforced plastic - and in aircraft use this is thermoset plastic, typically ...
hard coating5/20/2012andy mackay
  Q: My name is Edward.I m developing food industry device and one part of device is made ...
  A: you can unravel some filaments and wind them onto a small mandrel - assuming your ulterior motive is ...
Boundary Conditions for Free Warping3/30/2012Ever Barbero
  Q: Dr Barbero, I have modeled an composite I beam in ANSYS with the help of shell181 elements. I want ...
  A: I don't understand what BC and what loading you want. I understand you don't want warping ...
curved beam3/13/2012Ever Barbero
  Q: I study on laminated curved beam with variable curvature with first shear deformable theory. what ...
  A: Strain-displacement are the definitions of strain as derivatives of displacements. Eq. 6.3, in Into ...
fabrication composite3/12/2012andy mackay
  Q: I have enquiry regarding fabricate a composite. I have a very limited fibres which I've produced by ...
  A: I'm not sure what you mean by limited fibres - do you mean they are short? Best to lay them up in ...
composites2/11/2012Ever Barbero
  Q: longitudnal stress,tensile strength,tensile transverse strength,and transverse comporesive strength ...
  A: I assume that the 9 orthotropic properties that you have are the stiffness, called E1, E2, etc. or ...
Stress in principal co-ordinates2/2/2012Ever Barbero
  Q: Dr. Barbero, This is regarding your reply for my last question regarding the stresses in principal ...
  A: ANSYS: How to display in lamina coordinates as opposed to global. Using RSYS, SOLU (in menus: ...
Biocomposite2/2/2012andy mackay
  Q: Good day, i am doing research on biocomposite. In order to do my samples, i need to determine the ...
  A: Typically the formula used is fibre volume fractin - how much fibre is in a finished composite item. ...
ANSYS MODELLING1/30/2012Ever Barbero
  Q: Dr Barbero, Currently I am working on a Composite I beam. I have created a Composite I beam with 3D ...
  A: In most cases it is not a good idea to use solid elements to model a thin walled beam (such as an I ...
design of zero CTE composite panels1/24/2012Ever Barbero
  Q: While reading on the carbon fiber composites, some text books claim using carbon fiber it is ...
  A: It is true. Depending of the fiber volume, you can make it zero or negative in one direction for one ...
latex substitute?11/28/2011andy mackay
  Q: **i have to wear a post-op prescrip compression stocking (absolute support hosiery). **the package ...
  A: You might be able to ask the prescribing doctor or nurse - or the hospital/clinic you got the ...
composite materials11/22/2011Ever Barbero
  Q: I AM DOING HYBRID COMPOSITE MATERIAL PROJECT.I HAVE DROUGHTS IN CALCULATING VOLUME FRACTION OF ...
  A: As it is explained in my textbook http://barbero.cadec-online.com/icmd/, all the formulas for volume ...
Self-healing composite on helicopters11/17/2011andy mackay
  Q: I am currently researching on a project at my university on adapting self-healing composites on a ...
  A: I did read something last year that discussed filling the fibreglass strand itself with a liquid ...
rule of mixture in composite material10/13/2011Ever Barbero
  Q: sir how to find silicon and aluminium carbide density send the calculation
  A: Silicon is an element (Si), so its density is known experimentally. Aluminum carbide is a chemical ...
Bow Shipping Tube10/8/2011andy mackay
  Q: I have a particular application and am looking for a low-cost solution. I'd value your advice. I ...
  A: Have you thought about using cardboard tube with perhaps a thin layer of fibreglass over the top? ...
crack propagation in composites9/5/2011Ever Barbero
  Q: Barbero, I am a PhD student in university of Toronto and I have a question regarding to cracks in ...
  A: It is not clear how the pressure is applied. Anyway, if the faces of the delamination crack are ...
Composite Hydraulic Telescopic Hoist9/2/2011andy mackay
  Q: We have been working on a hydraulic telescopic hoist project designed for dump trailers for the past ...
  A: I'd need to see the specifications of the hoist, SWL, reach, and planned design before I could ...
Vacuum Infusion8/15/2011andy mackay
  Q: I have a confusion. After the resin is totally infused, should the vacuum pump stay 'on' for the ...
  A: You need the vacuum pump on until the resin has cured ! The only time you would ever consider ...
density of fiberglass7/28/2011Ever Barbero
  Q: We are doing an analysis of our USEPA laboratory and we need to calculate the mass of materials. We ...
  A: You have a "composite" made of a matrix (such as polyester) reinforced with fiberglass. From ...

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Composite Materials

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andy mackay

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Expertise

Composite fabrication and testing, plug and mould design & build, surfacing materials, gelcoats, resins (epoxy, polyester, BMI, urethane) GRP, FRP, carbon, aircraft and marine composites, infusion techniques, Light RTM methodology, troubleshooting materials and process engineering.

Experience

11 yrs experience with aeronautical, marine and bathroomware composites.

Education/Credentials
Royal New Zealand Air Force Advanced Composites Course BCA Victoria University, Wellington, 1995

Past/Present Clients
Aeronautical, marine and bathroom ware composite cmanufacturing.

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