An Analysis of Head Impact Angle on the Dynamic Response of a Hybrid III Headform and Brain Tissue Deformation PDF Download
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Author: Anna Oeur
Publisher:
ISBN:
Category : Angles (Geometry)
Languages : en
Pages :
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Book Description
The objective of this research was to better understand how impact angle influences headform dynamic response and brain tissue deformation. A bare headform was impacted using a pneumatic linear impactor at 5.5 m/s. The impacts were directed on the front and side location at angles of 0, 5, 10 and 15° rightward rotations as well as -5, -10 and -15° (leftward) rotations at the side to examine the characteristics of the head and neckform on the results. Peak resultant linear and rotational accelerations from the headform as well as peak maximum principal strain (MPS) and von Mises stress (VMS) estimated from a brain finite element model were used to measure the effect of impact angle. Significant results were dependent upon the impact angle and location as well as the dependent variable used for comparison (p
Author: Anna Oeur
Publisher:
ISBN:
Category : Angles (Geometry)
Languages : en
Pages :
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Book Description
The objective of this research was to better understand how impact angle influences headform dynamic response and brain tissue deformation. A bare headform was impacted using a pneumatic linear impactor at 5.5 m/s. The impacts were directed on the front and side location at angles of 0, 5, 10 and 15° rightward rotations as well as -5, -10 and -15° (leftward) rotations at the side to examine the characteristics of the head and neckform on the results. Peak resultant linear and rotational accelerations from the headform as well as peak maximum principal strain (MPS) and von Mises stress (VMS) estimated from a brain finite element model were used to measure the effect of impact angle. Significant results were dependent upon the impact angle and location as well as the dependent variable used for comparison (p
Author: Clara Karton
Publisher:
ISBN:
Category : Biomechanics
Languages : en
Pages :
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Book Description
The varied impact parameters that characterize an impact to the head have shown to influence the resulting type and severity of outcome injury, both in terms of the dynamic response, and the corresponding deformation of neural tissue. Therefore, when determining head injury risks through event reconstruction, it is important to understand how individual impact characteristics influence these responses. The effect of inbound mass had not yet been documented in the literature. The purpose of this study was to determine the effects of inbound mass on the dynamic impact response and brain tissue deformation. A 50th percentile Hybrid III adult male head form was impacted using a simple pendulum system. Impacts to a centric and a non-centric impact location were performed with six varied inbound masses at a velocity of 4.0 m/s. The peak linear and peak angular accelerations were measured. A finite element model, (UCDBTM) was used to determine brain deformation, namely peak maximum principal strain and peak von Mises stress. Inbound mass produced significant differences for peak linear acceleration for centric (F(5, 24) = 217.55, p=.0005) and non-centric (F(5, 24) = 161.98, p=.0005), and for peak angular acceleration for centric (F(5, 24) = 52.51, p=.0005) and non-centric (F(5, 24) = 4.18, p=.007) impact locations. A change in inbound mass also had a significant effect on peak maximum principal strain for centric (F(5, 24) = 11.04, p=.0005) and non-centric (F(5, 24) = 5.87, p =.001), and for peak von Mises stress for centric (F(5, 24) = 24.01, p=.0005) and non-centric (F(5, 24) = 4.62, p=.004) impact locations. These results indicate the inbound mass of an impact should be of consideration when determining risks and prevention to head and brain injury.
Author: Scott G. Foreman
Publisher:
ISBN:
Category : Biomechanics
Languages : en
Pages : 108
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Book Description
Author: Marshall Kendall
Publisher:
ISBN:
Category : Biofidelic
Languages : en
Pages : 11
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Book Description
The development of surrogate headforms with similar dimensions and weight to that of a human head has allowed researchers to collect dynamic impact response data for impact reconstructions and injury assessment. These headforms are relied upon to deliver accurate and repeatable dynamic impact response data for setting helmet certification standards as well as head injury reconstruction. With recent research demonstrating the importance of measuring three dimensional dynamic impact response characteristics, the Hybrid III headform is a potentially a good candidate for use in standards testing and impact reconstructions. Currently, this headform is validated with a single 37.6-cm drop to the front region of the headform with an acceptance window of 50 g. Therefore, the purpose of this study was to compare the dynamic impact response of two Hybrid III headforms and verify repeatability, compare dynamic impact response, and determine how closely the two headforms correlate across different impact conditions. Two Hybrid III headforms were dropped from nine heights at two impact locations (front and side). Results of this study show that the two headforms are highly correlated across drop heights. Significant differences in terms of dynamic impact response were found between the two headforms across impact conditions. This study showed that two Hybrid III headforms produce similar mean peak linear acceleration for front centric impacts, however, differ significantly for mean peak angular response.
Author: Philippe Rousseau
Publisher:
ISBN:
Category : Biomechanics
Languages : en
Pages : 150
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Book Description
Author: Isabelle Gagnon
Publisher: CRC Press
ISBN: 1351645633
Category : Medical
Languages : en
Pages : 557
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Book Description
Sport-related concussions have become an increasingly important topic as evidenced by recent media attention. Due in large part to the complex nature of concussive injuries, there is great discrepancy in the effect these injuries have on individual functioning and the type and nature of services that best facilitate recovery. This book is intended as a complete reference guide dealing with sports-related concussions.
Author: Jeffrey A Pike
Publisher: SAE International
ISBN: 0768064422
Category : Technology & Engineering
Languages : en
Pages : 218
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Book Description
Nearly 50,000 Americans die from brain injuries annually, with approximately half of all Traumatic Brain Injuries (TBI) being transportation-related. TBI is a critical and ever-evolving safety topic, with equally important components of injury prevention, consequences, and treatment. This book is part of a 3-volume set which presents a comprehensive look at recent head injury research and focuses on head impact injuries and features 13 technical papers. These publications are primarily related to head impact and the resulting injury to the outside of the head – the skin, the bones of the skull, and sensory organs. Editor Jeffrey A. Pike has selected the most relevant technical papers spanning the early 1990s through the beginning of 2011, including several older papers which provide an essential historical perspective. Each volume in the series also includes a table of references arranged by topic and a new chapter tying together anatomy, injury, and injury mechanism topics. Buy the Set and Save! Head Injury Biomechanics The three-volume set consists of these individual volumes: Head Injury Biomechanics, Volume 1--The Skull Head Injury Biomechanics, Volume 2--The Brain Head Injury Biomechanics, Volume 3--Mitigation
Author: Katrina Zanetti
Publisher:
ISBN:
Category : University of Ottawa theses
Languages : en
Pages :
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Book Description
The objective of this study was to determine the degree of association of peak resultant linear acceleration with maximum principal strain, von Mises stress, and strain rate in the cerebrum. Three prevalent head impact mechanisms in the sport of football were represented by impacting an accelerometer-outfitted Hybrid III headform. Head to head impacts were characterized using a linear impactor, falls to the ground using a monorail drop, and elbow or forearm strikes to the head by a pendulum system. Representative inbound impact velocities were selected according to epidemiological research. Impacts were performed at nine prescribed centric and non-centric sites on the head. Finite element modeling using the University College Brain Trauma Model was employed to obtain peak values of maximum principal strain, von Mises stress, and strain rate in the cerebrum. Pearson product-moment correlation coefficients (r) were calculated between peak resultant linear acceleration of the head and peak MPS, VMS, and strain rate in order to determine the degree of correlation between the variables. This was determined for each impact mechanism and location as well as for all mechanisms together. Significant correlations (p
Author: Natalie R. Coulson
Publisher:
ISBN:
Category : Biomechanics
Languages : en
Pages : 206
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Book Description
Author: W. King
Publisher: Springer Science & Business Media
ISBN: 1475715021
Category : Technology & Engineering
Languages : en
Pages : 401
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Book Description
