1.3.5 Head injury criterion (HIC)
The head injury criterion (HIC) is calculated from the resultant of accelerometer time
histories as the maximum (depending on
[equation]
where
a
is the resultant acceleration as a multiple of gravity ‘g’ (1g = 9.81 m/s
2
) and
t
1
and
t
2
are the two time instants (expressed in seconds) during the impact, defining the beginning
and the end of the recording for which the value of HIC is a maximum. Values of HIC for
which the time interval (
t
1
−
t
2
) is greater than 15 ms are ignored for the purposes of
calculating the maximum value.
NOTE: The head injury criterion may also be referred to as the ‘head performance criterion’
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