Chapter13_bndg

Chapter13_bndg - Chapter 13 Chapter 13 Itty-bitty...

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hapter 13 Chapter 13 Itty-bitty Introduction to Joining Technology
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ecommended Reading Recommended Reading allister p. 386, 555 - 57, Callister p. 386, 555 557,
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verview of Joining Overview of Joining Fasteners Adhesive bonding Fusion and Solid State Welding us o a d So d State We d g Soldering razing Brazing Diffusion Bonding
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Overview -Comparison of joining methods Method Strength Design Reliability Cost Variability rc weld ery good ood ery good ood Arc weld Very good Good Good Nuts & Very good Good Fair bolts Rivets Very good Good Good Adhesive onding Fair Good Good bonding
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echanical Fastening Mechanical Fastening The most common method of permanent (or semi- permanent) mechanical joining is by riveting. Hundreds of thousands of rivets used in commercial aircraft. Three basic steps: hole preparation, insertion of rivets and deformation of the ends by upsetting. solid river b tubular rivet c split rivet a. solid river, b. tubular rivet, c. split rivet
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echanical Fastening Mechanical Fastening ther types of mechanical fastening is by Other types of mechanical fastening is by using threaded fasteners (bolt, screws). an be secured using nuts tapped or self Can be secured using nuts, tapped or self tapping. Nb. Self tapping: the screw either cuts or forms the thread into the part to be fastened. Particularly effective and economical in plastic products where no holes or nuts are required.
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Adhesive Bonding troduced in WW II for large scale Introduced in WW II for large scale assembly of load bearing components in ircraft a cat Current use – helicopter blades, honeycomb ructures aircraft bodies and control structures, aircraft bodies and control surfaces t h t i i d h i d i ld Synthetic organic adhesives are used in load bearing applications
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• Adhesives are available in several forms: liquid, paste, solution, emulsion, powder, tape and film. • Surface preparation and application: • Joint strength depends greatly on the absence of dirt, dust, oil and other contaminant. • Typical surface preparation steps include: vapor degrease, alkaline cleaning, anodizing and application of primer
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ajor Classifications Major Classifications Chemically reactive; e.g., polyurethanes, oxies cyanoacrylates modified acrylics epoxies, cyanoacrylates, modified acrylics Pressure sensititive; e.g., natural rubber, uct tape duct tape Hot melt; e.g., ethylene-vinyl acetate, olyolefins polyesters polyolefins, polyesters Film; e.g., nylon-epoxies, polyimides thers include delayed tack and electrically Others include delayed tack and electrically and thermally conductive
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• Film adhesives are used in applying composite patches. They cannot fill gaps. High molecular weight backbone with a cross-linking resin plus curing agent.
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This note was uploaded on 11/13/2011 for the course CIVE 2*** taught by Professor - during the Spring '11 term at Carleton CA.

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Chapter13_bndg - Chapter 13 Chapter 13 Itty-bitty...

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