IAAF Calibration and Testing Manual - Asian Athletics Association

IAAF Calibration and Testing Manual
P/2
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L/4 L/4 L/4 L/4
CLsym
Bending Moment Distribution
PL/8
Figure 4. Schematic of Loading of Handle Grip and bending Moment
Distribution
Test Procedure
The Hammer Handle is mounted on the upper and lower mounts as described
above which were inserted into the jaws of the Instron Hydraulic Test
machine. The test data consisting of the applied tensile load and the axial
displacement (elongation of the hammer handle) are recorded digitally via a
data acquisition board into a PC for processing. All specimens were initially
loaded up to about 4kN (approximately the working load, i.e. the maximum
load expected to be exerted on the hammer handle when used in
competitions) at a slow loading rate of 1mm/min, and the load and
displacement data collected at a sampling rate of about 4 samples/s. The
specimens are then unloaded and inspected for any permanent deformations.
An intermediate load step of up to 8kN is employed if the handle is capable of
withstanding this load. Finally the specimen is loaded until failure occurs. For
the final tests (loading up to failure) a typical displacement rate of 5 mm/min
and sampling rate of 20Hz (20 samples/s) is employed. The failure mode of
the hammer handle is observed and recorded photographically.
Performance Requirements
Using the above test procedure the total deformation of the handle in the
direction of the load under a tension of 3.8kN shall not exceed 3mm and the
minimum handle breaking strength shall be 8kN.
Edition 2010 28