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Massimiliano
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Hi, in general, when it is better to use one or another?
On my specific case, I need to bond stainless steel to carbon fiber panel.
Appearance is not important.
The bond has to resist pull force, pull shocks, salt water.
UV resistance is desired but the part could be coated for UV protection so no big deal.
Thanks
Massimiliano
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torsten Ker
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Methyl methacrylate adhesives may be better for your application because it allows for expansion and contraction of different bonded materials better then epoxy
Epoxy may be to inflexible and brittle which leads to cracks and bond failure.
Methacrylate adhesives are used to glue windscreens to metal car bodies for example without any special keying of surfaces, the only problem may be low grade stainless steel
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Massimiliano
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+xMethyl methacrylate adhesives may be better for your application because it allows for expansion and contraction of different bonded materials better then epoxy Epoxy may be to inflexible and brittle which leads to cracks and bond failure. Methacrylate adhesives are used to glue windscreens to metal car bodies for example without any special keying of surfaces, the only problem may be low grade stainless steel Thanks It will be 316 L
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torsten Ker
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PS: just to be sure I would tape up the surouding area of where the steel is to be bonded to and key the bonding resin surface a bit with wire wool.
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Massimiliano
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+xPS: just to be sure I would tape up the surouding area of where the steel is to be bonded to and key the bonding resin surface a bit with wire wool. Thanks, what do you mean by tape up the surrounding area? To add carbon at the edge of the steel?
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Hanaldo
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Would need to know more about the application, from what you've told us either adhesive would be fine. When bonding dissimilar materials, elongation is an important part of the adhesives properties, but semi-flexible structural epoxies like Araldite 2015-1 would be very good. In fact you can even get structural epoxies that you can tie in a knot they are so flexible. Car manufacturers will also use epoxies and polyurethanes to bond windscreens and other parts of the car, so it isn't as black and white as that.
What sort of vibration do you expect in the application? What sort of temperature cycles will it need to withstand? Is the bonded structure increasing the rigidity of the composite panel, like an I-beam, or is it purely an assembly joint?
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Massimiliano
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+xWould need to know more about the application, from what you've told us either adhesive would be fine. When bonding dissimilar materials, elongation is an important part of the adhesives properties, but semi-flexible structural epoxies like Araldite 2015-1 would be very good. In fact you can even get structural epoxies that you can tie in a knot they are so flexible. Car manufacturers will also use epoxies and polyurethanes to bond windscreens and other parts of the car, so it isn't as black and white as that. What sort of vibration do you expect in the application? What sort of temperature cycles will it need to withstand? Is the bonded structure increasing the rigidity of the composite panel, like an I-beam, or is it purely an assembly joint? Hi, it is an assembly joint. Please see below the attached SS316L part (dark purple) and the actual shape the SS316L will have. Carbon fiber plate will have peelply texture, while SS will be properly etched. As this is an outside application, temperature range can vary from 0 C in the winter to 40 C in the summer (not that much excursion during the days). Vibration will be mostly low vibration from a nearby outboard (not directly connected to the part). Occasionally there could be pull forces. I have both Araldite 2015 and the MMA from EC at hand, what do you suggest to use?  
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torsten Ker
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hah, that looks a bit differnet to what I imagined reading the initial post,that is quiet a small surface area to bond and that really depends on the force you expect.
Epoxy used to laminate of infuse is definetly not a choice, aircraft grade epoxy glue is too expensive and I would test the MMA
You may have to resort to a mechanical solution having a backplate and rivets or bolts trough the carbon, that depends on teh core if you use any
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Massimiliano
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+xhah, that looks a bit differnet to what I imagined reading the initial post,that is quiet a small surface area to bond and that really depends on the force you expect. Epoxy used to laminate of infuse is definetly not a choice, aircraft grade epoxy glue is too expensive and I would test the MMA You may have to resort to a mechanical solution having a backplate and rivets or bolts trough the carbon, that depends on teh core if you use any Hi, size of the base will be 100 x 80 mm. The carbon will be 3mm carbon, 3mm soric, 3mm carbon
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Rosta Spicl
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Like a Torsten said, if the bonded join is safety relevant, use some type of mechanical joint for sure. From the long time usage point of view, the water and UV is killer for epoxy.
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