Best way to joint fabricated carbon strut structure.

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Best way to joint fabricated carbon strut structure.

Author	Message
Warren (Staff)	Warren (Staff) posted 11 Years Ago HOT Post Details
Group: Administrators Posts: 2.5K, Visits: 8K	They should be bonded in using a structural adhesive like our ET515Semi Flexible 15min Epoxy Adhesive The braiding you want to add will just add further strength but isnt essential if you use inserts. Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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Tobias	Tobias posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 6, Visits: 16	Hi Warren, So if you were to build such a structure, you would work with alloy inserts and a braided sleeve, or is there another approach that you would prefer? And should the inserts be glued in using the same epoxy resin as the wetting, or should they be made of a more flexible epoxy? Cheers, T
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Warren (Staff)	Warren (Staff) posted 11 Years Ago HOT Post Details
Group: Administrators Posts: 2.5K, Visits: 8K	The strongest of the 3 is the tube joiner in aluminium. Such inserts are commonly used to join carbon tubes. You need to ensure the insert extends a fair way into the tube to spread the load at the joint. Also with pultruded tube, the insert cannot be too tight otherwise it will split the tubes. You will find Roll wrapped tubes are stronger in practice for this kind of application due to the extra strenthening around the tube. Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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Tobias	Tobias posted 11 Years Ago HOT Topic Details
Group: Forum Members Posts: 6, Visits: 16	Hi there, I am pretty new to working with carbon, but have a good background in other materials. I am working on designing a strutted framework, fabricated out of 5mm pultruded carbon tube, and I thought it best to seek some advice about how best to make the joints. My plan is to build a jig which holds everything flat, and use a braided sleeve to form a reinforced skin. However since I also plan on painting the structure, I don't necessarily need the braid for aesthetics, however I also don't want 'spider knees' at each join. To simplify things, lets assume i am building a small chair, with some structural triangulation, which needs to hold about 10kg ( so in real world terms I guess it has to be over-engineered to not fail under 50kg, or something of the kind ). In my crude drawing I have 3 potential jointing processes, but I wonder if there is another I have not considered, or if I would be better off making a mould and a core, and using a cast component joined by tubes, rather than attempting to join struts together. Thanks, T Attachments image.jpg (825 views, 114.00 KB) Tags Carbon joint pultruded tube strut
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