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Flashcards in Lec19 adhesives Deck (12)
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1

adhesives

are very strong, material around them normally fails first

2

applications

many applications

3

anaerobics adhesives

activate due to absence of air causes curing to take place

4

Types of adhesive

epoxy
cyanoacrylate
hybrid
sealants

5

Methods of glue drying

UV
anaerboic

6

adhesives are strong and weak under what type of loads

strong under shear load
weak under peal load

7

to maximise joint strength increase overlap length or joint width

increase joint width improves joint strength, increasing overlap does not have the same affect

8

UV adhesives adv

very fast drying time
can position part and then once happy use UV to set
BUT do need UV lighting

9

Epoxy

two parts - resin and hardener
cure time 5 min or 4 hours slower the cure stronger the bond

10

what surface prep is require

need to clean surfaces - dont want to glue the dirt and grime together

11

To toughen adhesives can add what

rubber will increase strength against peel loads

12

Cyanoacrylate

easy to dispense
quickly cures so can achieve 60% strength after 1 minute 100% after 24 hours