Excellent presentation Sir.
Thank you sir
01:36 Table of Contents02:39 Need For Testing05:19 Major Types of Testing09:36 Mechanical Testing14:09 Tensile Test19:14 Compression Test22:11 Flexural Testing23:09 Shear Test24:49 Peel Test25:34 Impact / Toughness Test29:46 Creep Test32:23 Fatigue Test35:22 Chemical Testing36:17 tHERMAL tEST39:43 Rheological Test
Thanku sir
Excellent sir
Excellent Sir, I cleared lots of things this presentation
very important
very nice lecture sir, now understood many topics
I think that was supposed to be 2300% (not 230%) for fiber/steel.
Interesting. Guess this is why racing craft are way ahead in using these materials. And why IMOCA yachts are fragile in some cases.Worries me about the now widespread use in airliners. But I guess their stress limits are much lower compared to ships.
2.5x is 150%
You're very knowledgeable, in contrast your energy level is just not very captivating, I endured due to a vested interest in the tech, but if you want more likes, and more views, you need to zest it up a bit!
You still design vessels made of wood? Its a natural composite. Imagine luthier standards applied to wood for a boat design
I've got one for you Viable hull material? Cant be welded but you can get the honeycomb without the plating on either side. Thinking it might be able to replace the foam core? Or (this is a bit much I know) possibly use it as is and encase it with a composite. Ala... Connect Four" lol! Yes the Hasbro game! By that I mean, Slotted Edged Ribs, slide the panels in (which can be bent), use this to seal and hold in place on the inner hull, then composite around the outer hull. Sorry, I know it sounds like Im trying to reinvent the wheel here but I have had this idea for a possible modular kit offering in my head for over a year now and I just HAVE to know if these materials may be viable! Not an engineer but will most likely soon have the cash to be able to start a business around it. Can you please let me know if I am crazy or not? Lol! And yes, I do plan on using you for the design, if viable. And willing to destroy few hulls to test the proof of concept. Would really appreciate your feedback.
How does aluminium hull elasticity and plasticity compare to that of steel hulls? If I wanted the most durable hull possible, would it be advisable to 'not' use aluminium even though I might save weight?
As someone who has built a number of hand laid Glass Fibre boats from 24 to 29 foot, I would NOT reccomend or use Fibreglass as a boat building material. Ok for a runabout but believe me....Gell coat covers a multitude of sins.... think about it. If you knew how many bubbles/faults/gaps in fibreglass boat building you would not buy one.
Thank you Nick. Soon you'll be able to grow your own composites with self-organising compounds, much the way a crystal 'grows' in nature. Great video and Fair Winds to you..
Interessting overview about composit structures, all the downsides that are listed, most likely to represent reference to glass, and to level of design/enginerring , and at last degree the method/capacity of manafuctruing parts ( process, tooling rigging/handling and cost).IF we talk about problems on materials with wicker spots on diferent material, for example welding, thats why you due inspections & x-rays to them.If we refer to quality built composites they will deliver the promisse but at higher prices, there are not "only" good conditions, or you have or not , elese is scrap parts or poor designi find very "off" to compare the "promisse" to "real", the sample to qualify composite material have in consideration how the are built (%resin, fiberplacement, delaminations, voids..), etc.Composite material have good properties if their are handled properly (according with their manufcturing process) as any other material.Under the test X with X properties the strenght is X, so its the reference. Can't expect to use the same amout of fiber and resin of the qualification, and thats it. Rarely seen clean rooms, ply cutters, layup tooling, vaccum tools or cure system. So then appear the worst condition, and people seam to be satisfied.For calculus the contribution of resin is never accounted as it doesnt contributes and the fiber /plies need to comply with maximum deviation with their orientation as well other safety factors(reducing their max strenght).Honestly i disagree because with proper mafcturing (that is expensive), quality control and design, i those are great.apart ofour different views,Thank you for your videos, its great to see people sharing their knownledge & experience
Hello. Could you do some kind of analyze video for the Rafnar's K hull shape? It looks very interesting and i would like to hear your opinion about it.
How did you manage to repair a broken composite hull with the same safety margin compared to a steel one ? I just think of repairing a basic kayak 50 years ago... Steel and other traditional materials seems to me to be safer ! Thank you for the video.
Cost of the resins, particularly epoxy, is enormous too.
Thank you, you answered a question I was actually pondering over
NRP Tejo P590 Portuguese Coastal Patrol Vessel -from 1995 still going strong -all-composite construction, one-piece hull! -and superstructure is also made in carbon fibers, engineered in the early 80s -40 years ago now, the 54 meters length were maximum size in the 80s https://www.youtube.com/watch?v=hqLZDyaggXk&ab_channel=TomMcCleanPositiveBelfast
And a little info on the former Royal Danish Navy's "Flyvefisken": and Danish naval architects/engineers are almost 40 years ahead! here is a link to Royal Swedish Navy "Visby class" corvette, the class where designed in the late 90s. After delays, the first "Visby" enter service in 2009. The same Swedish naval architects had 15 years earlier worked with the Royal Danish Navy and naval architects on the first full hull composite build fast Standart Flex 300 type multirole ship/Patrol vessels(multi-purpose, modular weapon system as engines too), know as the "Flyvefisken" class. At the time they were the maximum length a carbon/composite vessel could be built. Resin is control in a controlled environment -know as an own ;-), as strength goes the biggest issue is micro air bubbles in the resin! this issue where address in the "Flyvefisken" second batch -or "Mark 2" from1992 by using a vacuum, making the hull on top of the mold, and suck the resin true the carbon layers. The Swedish naval architects had pioneer composites constructed vessels and were therefore contacted by the Royal Danish navy in the early 80s as partners, so the "Visby" class benefits from the experiences learned from the 80s in this partnership. https://www.youtube.com/watch?v=H9RdcmICyuQ
I feel like I just became more understanding of the hairline cracks in my 30 years old fiberglass day cruiser. Thanks for a good video Nick!
Thanks again for making these awesome videos!
Can you please quantify the term strength as your use of the term seems to be to mislead The same with the term composite Composite is a material which is produced from two or more constituent materials. The steel used is ship construction s technically a composite. Quantifying your position is critical. Fibre-reinforced polymer (plastic) like steel is not a generic composite, Almost all of your arguments against FRP can also be applied honestly to metal Both are dependent on orientation thickness and composite attributes By using eg Carbon E-glass S-glass aramids etc, then there is the polymer it is encased in modifies and negates the argument. As this is the same for steals do they include for example carbon alloys silicates etc then there is the crystalline structure orientation etc. The thickness and how it is combined is also a factor like it is with FRP. With FRP a core is used as is a web is with most meatal to deflect/resist loads. This aligns with your final inference that the manufacturing control of the laminate integrity, this is mitigated in many ways. As with metal testing is key to checking and specifying the properties of the product throughout the process by testing eg weight, accounting of quantity and visual inspection, etc Then there is mechanical testing and x-raying etc. The testing of all materials have the same outcome you will always take the lowest denominator and apply it to the approved safety factor. Every product needs to be correctly engineered and specified with the appropriate safety factor. The engineer when spec-ing FRP like metal must mitigate material inconsistency with the specific specification, in metal plate by specifying alloy content and combinations etc( 41xx steel) with FRP they will specify a filament arrangement percentage to a polymer percentage. They may instead specify an engineered prepregs location and orientation to achieve greater control over the outcome. They may similar to a steel web weld specify the core (web), polyemer bonding agent.In conclusion, FRP has no limitation in relation to any other correctly engineered and managed material. The true reason that it is not so widespread is more to do with the cost, eg the complexity of construction. and economy of scale. This is another complex story. I do believe in the future that FRP will become far more commonplace in modular supper structures. If modular they can be reused over and over after a hull reaches its used by date As it will save on maintenance and reduced VOG's and displacement mass Things like prop shafts as the economy will outweigh costs. The same with Propeller blades as large scale Cabon fibre FRP 3D printing is not far away and the benefits will be huge. Again another story for another time. Sorry, that got away from me, I was only going to referance the first few sentences.
Please provide ppt sir..
Hi.. This is out of topic but I want to ask can we adapt the compression standard for impact test Help me anyone
which software is used for modelling of composite material.
excellent analysis
thank you very much for the tutorial, I want to simulate a composite ring in thickness 5 mm, in part, what should I selected shell or solid and that choice affects the result or not
Hi! That was a pretty good video. Do you have any tutorial about VCCT delamination? Even a written tutorial is helpful! Thank you!