Injury Assessment of Focal Loading Using the Mandible Load Sensing Headform with a Multi-point Thin Film Force Sensor


  1. Fournier, E.
  2. Williams, K.
  3. Wonnacott, M.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN);Biokinetics and Associates Ltd, Ottawa ONT (CAN)
Military helmets are evolving to improve protection and coverage against fragments, behind armour blunt trauma (BABT), and blunt impact trauma. Providing additional coverage is a challenge due to compromises between human factors requirements and desired coverage and protection. In order to properly assess these trade-offs, it is important to be able to quantify the protection system performance in terms of injury mitigation. However, there are few applicable test methodologies to support product development or acceptance testing. A preliminary injury assessment methodology for evaluating the performance of mandible guard systems has been developed based on the mandible load sensing headform (MLSH) which was designed for the assessment of mouth guards used in American football. The MLSH comprises a Hybrid III 50th percentile headform modified to include an articulating jaw with representation of the upper and lower dentition. Unfortunately the original headform instrumentation was found to be inadequate for distinguishing between unprotected and protected impacts due to the stiffness of the MLSH’s jaw and the placement of its measurement load cells in the upper dentition and the temporal mandibular joints. A brief feasibility study using discrete Tekscan FlexiForce® thin film force sensors mounted on the MLSH jaw demonstrated the value of contact force gauges to augment the headform’s measurement capabilities. These findings led to the implementation of a custom multipoi
jaw fracture;impact;behind armour blunt trauma;BABT;instrumentation;surrogate;biofidelic;test methodology
Report Number
DRDC-RDDC-2014-P66 — External Letter
Date of publication
18 Nov 2014
Number of Pages
Electronic Document(PDF)

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