Summary
The more important factors affecting bend recovery are:
• Temperature
• Humidity
• Total strain (deflection)
• Strain rate
• Time under load
• Relaxation time
The effect of each factor on bend recovery was measured by
keeping the others constant. Several general conclusions may
be drawn from the data in this bulletin. The more important
conclusions are listed below:
• With all factors held constant, a fundamental bend recovery
value may be obtained for each material. This is an inherent
property of that material.
• With all factors held constant, except one:
◆ Bend recovery is maximum for Tynex® at room temperature
or slightly above and lower at either higher or lower
temperatures.
◆ Bend recovery of Tynex® is less temperature-sensitive than
that of 6 nylon or 66 nylon.
◆ Humidity has no measurable effect on the bend recovery of
Tynex®.
◆ The greater the deflection, the lower the bend recovery for a
given material.
◆ Small and rapid deformations of nylon are perfectly elastic
and result in complete recovery.
◆ The shorter the time under load, the higher the bend
recovery.
◆ The longer the relaxation time, the higher the bend recovery.