Load Link Examples and Construction
The Parks College Parachute Research Group
link is machined from stainless steel and strain gauges are selected
that match the temperature expansion of the particular material. The
strain gauges used on this particular link are Micro-Measurements part
number CEA-06-125UT-120. There are actually two strain gauges mounted
at 90 degree angles on the same strain gauge "patch". A patch is mounted
on both sides of the link and wired according to the diagram below. This
arrangement of the strain gauges minimizes any output from twisting forces
on the link and measures mostly expansion (pulling) forces.
The strain gauges have been mounted on the load link and small flexible
wires have been soldered to the strain gauge pads. Silicone sealant has
been used to keep the wires in place so that no stress is placed on the
solder joints. The strain gauge wires have been connected to a securely
mounted cable that exits the load link enclosure.
This Industrologic built link is also used by the PCPRG for scale model
parachutes and for forces in the range of one hundred pounds. It is made
from 1/16 inch thick and 1/2 inch wide aluminum and has holes for "Rapide"
links. The strain gauges are Micro-Measurements part number
CEA-13-125UT-350 which are designed for the temperature expansion of aluminum.