The head injury criterion (HIC) is a measure of the likelihood of head injury arising from an impact. The HIC can be used to assess safety related to vehicles, personal protective gear, and sport equipment.
Normally the variable is derived from the measurements of an accelerometer mounted at the center of mass of a crash test dummy’s head, when the dummy is exposed to crash forces.
It is defined as:
[1][2]
where t1 and t2 are the initial and final times (in seconds) chosen to maximize HIC, and acceleration a is measured in gs (standard gravity acceleration). The time duration, t2 – t1, is limited to a maximum value of 36 ms,[1][2] usually 15 ms.[3]
This means that the HIC includes the effects of head acceleration and the duration of the acceleration. Large accelerations may be tolerated for very short times.
At a HIC of 1000, there is an 18% probability of a severe head injury, a 55% probability of a serious injury and a 90% probability of a moderate head injury to the average adult.[4]
^ abMcHenry, Brian G. Head Injury Criteria and the ATB (PDF) (Report).
^ ab"Crash Tests and the Head Injury Criterion" (PDF). Archived from the original (PDF) on 2011-07-06. Retrieved 2009-11-03.
^A Test Methodology for Assessing Demining Personal Protective Equipment (PPE)] (Report). Archived from the original on 2013-04-09.
^MacKay, Murray (August 2007). "The increasing importance of the biomechanics of impact trauma". Sādhanā. 32 (4): 397–408. doi:10.1007/s12046-007-0031-9. S2CID 111347672.
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Global Information![{\displaystyle {\mathit {H}}{\mathit {I}}{\mathit {C}}=\max _{t_{1},t_{2}}{\bigg \{}(t_{2}-t_{1})\cdot {\bigg [}{\frac {1}{t_{2}-t_{1}}}\int _{t_{1}}^{t_{2}}a(t)dt{\bigg ]}^{2.5}{\bigg \}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/29667501f653c88b7ce40bbd537f1970c7894365)