Dilaver Singh | University of Waterloo (original) (raw)

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Papers by Dilaver Singh

Basic Finite Element Method as Applied to Injury Biomechanics

International Journal for Numerical Methods in Biomedical Engineering

International Journal of Impact Engineering

Annals of Biomedical Engineering

Blast wave overpressure has been associated with varying levels of traumatic brain injury in sold... more Blast wave overpressure has been associated with varying levels of traumatic brain injury in soldiers exposed to blast loading. In realistic blast loading scenarios, the mechanisms of primary blast injury are not well known due to the complex interactions of the blast wave with the human body, and the high acceleration experienced over very short time durations. The purpose of this study was to investigate head kinematics resulting from a range of simulated blast loading conditions corresponding to varying standoff distances, and differing heights of burst. This study considered peak linear acceleration, and the head injury criteria (HIC) to examine the effect of blast wave interaction on head kinematics using a validated multi-body model. A modified version of the GEnerator of Body Data (GEBOD) 50 th percentile male was validated against experimental blast data using a Hybrid III 50 th percentile male ATD. The blast wave was applied using an air blast function via the application of pressure loads corresponding to the detonation of a conventional spherical charge using an equivalent mass of TNT. This approach applied the blast shockwave, a rapid increase in pressure, temperature and density, and included Mach stem effects. As expected, the results demonstrated that head acceleration increased with decreased charge standoff distance, and severe head injury may occur in close proximity to blast as the head injury criterion threshold was exceeded for all explosive sizes at close proximity. The presence of a Mach stem resulting from an elevated charge has been found to increase the potential injury zone surrounding an explosive charge compared to a free field blast; this could be addressed through increased standoff or enhanced blast protection.

Conference Proceedings of the Society for Experimental Mechanics Series, 2014

International journal for numerical methods in biomedical engineering, 2014

Mild traumatic brain injury caused by blast exposure from Improvised Explosive Devices has become... more Mild traumatic brain injury caused by blast exposure from Improvised Explosive Devices has become increasingly prevalent in modern conflicts. To investigate head kinematics and brain tissue response in blast scenarios, two solid hexahedral blast-head models were developed in the sagittal and transverse planes. The models were coupled to an Arbitrary Lagrangian-Eulerian model of the surrounding air to model blast-head interaction, for three blast load cases (5 kg C4 at 3, 3.5 and 4 m). The models were validated using experimental kinematic data, where predicted accelerations were in good agreement with experimental tests, and intracranial pressure traces at four locations in the brain, where the models provided good predictions for frontal, temporal and parietal, but underpredicted pressures at the occipital location. Brain tissue response was investigated for the wide range of constitutive properties available. The models predicted relatively low peak principal brain tissue strains ...

Biomechanics / 752: Robotics, 2011