Finite element modelling of helmeted head impact under frontal loading

Pinnoji, Praveen K.; Mahajan, Puneet

doi:10.1007/s12046-007-0034-6

Cited by 24 publications

(7 citation statements)

References 8 publications

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“…Helmets, which include military helmets, motorcycle helmets, sport helmets, emergency service helmets and more, can protect the wearers from head injuries. Significant research work has been done on numerical simulations of mainly motorcycle helmets [25], [14], [22], [18. There is an important difference between the impacts to motorcycle helmets and ballistic helmets: the former one is usually relative low velocity and high masses while the later is high velocity and low masses. A ballistic helmet is able to stop handgun bullets and rifle bullets in some cases.…”

Section: Introductionmentioning

confidence: 99%

Simulation-Based Assessment of Rear Effect to Ballistic Helmet Impact

Yang¹,

Dai²

2010

Computer-Aided Design and Applications

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Ballistic impact is one of the major causes for traumatic brain injury (TBI) and ballistic helmets are designed to provide protection from TBI. In real life, it is impossible to use real human subjects for experiments. Therefore, simulation based-methods are convenient to assess the rear effect to ballistic helmet impact and can provide crucial insights to injury. Rear effect happens when the interior of helmet is deformed and contacts with the human head. This paper proposes a simulation-based method to study the rear effect by using Head Injury Criterion (HIC) when the ballistic helmeted headform is impacted by a bullet with different impact angles and at various impact positions. Commercial software package LS-DYNA is employed to simulate the impact. A high fidelity headform model including detailed skull and brain has been used for the simulation purpose. Helmet and bullet are modeled according to the real shapes. The results show that, with a larger impact angle, the HIC score is smaller and therefore there is less damage to the brain. Based on the HIC scores obtained from the impact simulations at various impact positions, the bullet from back is the most dangerous position to the wearer.

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Section: Introductionmentioning

confidence: 99%

Simulation-Based Assessment of Rear Effect to Ballistic Helmet Impact

Yang¹,

Dai²

2010

Computer-Aided Design and Applications

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“…~10,000 N as previously reported. 18,19 To estimate the associated duration of impact, the change in momentum of the striker was equated to the impulse applied to the skull, as shown in the following equation with representing the force, the mass, ∆ the velocity change, the impulse and the time: = ∆ = (3) Therefore, assuming a constant deceleration force, the duration of deceleration (from a recorded speed of 4.6 m/s) may be estimated as follows:…”

Section: Simulationmentioning

confidence: 99%

“…A constant impact force was applied, equal to the peak recorded impact force of the empirical tests, that is,~10,000 N as previously reported. 18,19 To estimate the associated duration of impact, the change in momentum of the striker was equated to the impulse applied to the skull, as shown in the following equation with F representing the force, m the mass, Dv the velocity change, I the impulse and t the time…”

Section: Simulationmentioning

confidence: 99%

Evaluation of bone excision effects on a human skull model—II: Finite element analysis

Franceskides

Gibson

Zioupos

2019

Proc Inst Mech Eng H

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Patient-specific computational models are powerful tools which may assist in predicting the outcome of invasive surgery on the musculoskeletal system, and consequently help to improve therapeutic decision-making and post-operative care. Unfortunately, at present the use of personalized models that predict the effect of biopsies and full excisions is so specialized that tends to be restricted to prominent individuals, such as high-profile athletes. We have developed a finite element analysis model to determine the influence of the location of an ellipsoidal excision (14.2 mm × 11.8 mm) on the structural integrity of a human skull when exposed to impact loading, representing a free fall of an adult male from standing height. The finite element analysis model was compared to empirical data based on the drop-tower testing of three-dimensional-printed physical skull models where deformations were recorded by digital image correlation. In this bespoke example, we found that the excision site did not have a major effect on the calculated stress and strain magnitudes unless the excision was in the temporal region, where the reduction in stiffness around the excision caused failure within the neighboring area. The finite element analysis model allowed meaningful conclusions to be drawn for the implications of using such a technique based on what we know about such conditions indicating that the approach could be both clinically beneficial and also cost-effective for wider use.

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“…The presence of different energy transmission paths in the skull-brain-neck system have been assessed [11]. Finally, the effects of protective devices such as helmets have also been studied [12,13].…”

Section: Brain Injury Mechanisms and Related Modelingmentioning

confidence: 99%

Investigations into Wave Propagation in Soft Tissue

Valdez

Balachandran

2010

IFMBE Proceedings

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Abstract--In this article, the authors investigate wave propagation in soft-tissue matter with the aim of understanding the following: i) influence of nonlinear material properties of soft tissue on its mechanical response when subjected to transient loading and ii) mechanical response variation with respect to frequency and amplitude of the loading. To aid these investigations, reduced-order models are constructed taking into account available experimentally determined brain tissue properties and these models are used to study onedimensional wave propagation in brain tissue fiber bundles. These investigations could help in furthering the understanding of wave phenomena in a skull-brain system subjected to transient loadings.

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Finite element modelling of helmeted head impact under frontal loading

Cited by 24 publications

References 8 publications

Simulation-Based Assessment of Rear Effect to Ballistic Helmet Impact

Simulation-Based Assessment of Rear Effect to Ballistic Helmet Impact

Evaluation of bone excision effects on a human skull model—II: Finite element analysis

Investigations into Wave Propagation in Soft Tissue

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