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Rigidity Tester.
Rigidity Tester -
The ability of a helmet to withstand deformation due to any force
acting on it is determined by subjecting it to a rigidity test. In this
test the helmet, without the head-form, is placed between two horizontal
flat parallel plates and is subjected to a small initial load and
subsequently to a major load over a specified time period. The change in
the dimension of the helmet under initial and major loads is measured
and compared against standard values.
The Rigidity Tester
for helmets consists of two solid steel plates held parallel to each
other with the help of four spacer rods. A loading plate with a guide
rod is guided along a vertical axis in a brass bush held in the upper
plate. The weight of the loading plate assembly is equal to the initial
load.
Major load is applied in specified steps by placing disc
shaped dead weights on top of the loading plate assembly. The deflection
of the helmet is measured with the help of a scale fixed to the frame
and a pointer fixed to the loading plate assembly.
The equipment
is designed for simplicity in use. It is finished in shore blue metallic
painting and bright chrome plating to give it a corrosion resistant
finish.
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