Fatigue Properties Of Vibration Welded Nylon 6 And Nylon 6,6 Butt Joints
Author(s)
K. Y. Tsang, D. L. DuQuesnay & P. J. Bates
Abstract
Fatigue properties of vibration welded nylon 6
and nylon 6,6 butt joints
K. Y. Tsang, D. L. DuQuesnay & P. J. Bates
Royal Military College of Canada, Kingston, Ontario, Canada
Abstract
The fatigue properties of vibration welded butt joints in two commonly used
thermoplastics, nylon 6 and nylon 6,6, are examined in this paper. Plaques were
welded at 212 Hz and at an amplitude of 1.8 mm to a weld penetration of 1.5
rnm. Dog-bone coupons were machined from the welded plaques and then
fatigue cycled at frequencies ranging from 3 to 10 Hz with a stress ratio of R=0.1
in load control. All coupons failed by fatigue initiated at the weld. Stress-life
data were generated for high pressure and low pressure welding conditions. They
all appear to have similar fatigue behaviour with the exception of nylon 6 welded
in high pressure. The temperature rise in the weld region during testing was
found to be insignificant and no physical thermal damage was observed.
Vibration welding of these materials appears to
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