The Effect of Inbound Mass on the Dynamic Response of the Hybrid III Headform and Brain Tissue Deformation PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download The Effect of Inbound Mass on the Dynamic Response of the Hybrid III Headform and Brain Tissue Deformation PDF full book. Access full book title The Effect of Inbound Mass on the Dynamic Response of the Hybrid III Headform and Brain Tissue Deformation by Clara Karton. Download full books in PDF and EPUB format.
Author: Clara Karton
Publisher:
ISBN:
Category : Biomechanics
Languages : en
Pages :
Get Book Here
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: Clara Karton
Publisher:
ISBN:
Category : Biomechanics
Languages : en
Pages :
Get Book Here
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: Anna Oeur
Publisher:
ISBN:
Category : Angles (Geometry)
Languages : en
Pages :
Get Book Here
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: Natalie R. Coulson
Publisher:
ISBN:
Category : Biomechanics
Languages : en
Pages : 206
Get Book Here
Book Description
Author: Scott G. Foreman
Publisher:
ISBN:
Category : Biomechanics
Languages : en
Pages : 108
Get Book Here
Book Description
Author: Marshall Kendall
Publisher:
ISBN:
Category : Biofidelic
Languages : en
Pages : 11
Get Book Here
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: Marjorie. R. Seemann
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 21
Get Book Here
Book Description
ABSTRACT -- In this paper human volunteer head/neck dynamic response is compared with that of a Hybrid III head and neck. The data base used for the comparison was taken from the extensive Naval Biodynamics Laboratory data base of human volunteers and manikin sled runs for various thrust vector directions.
Author: Hesam Moghaddam
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Traumatic brain injury (TBI) is a major health concern as about 2.9 million people TBI in the United States every year. Fall, accidents, and sports are major causes of impact induce TBI. While many finite element (FE) head models have been developed to understand the biomechanics of TBI under impact, the majority of them have overlooked the effect of skull deformation on the biomechanical responses of brain during blunt impacts. To this end, a FE study was carried out to investigate the correlation of skull deformation with brainu2019s tissue responses under blunt impact. North Dakota State University Finite Element Head Model (NDSUFEHM) was used to investigate the pressure and stress responses of the brain under different impact conditions. The impacts were carried out at a 45o-tilted orientation using two different impact velocity, 10 m/s and 13 m/s, which resulted in a total of two different impact scenarios. LS-Dyna nonlinear FE solver and LS-PrePost were employed to perform all simulations, record data and visualize results. Specifically, the intracranial pressure (ICP), maximum shear stress (MSS), were recorded and analyzed for two different impact velocities. These biomechanical responses were recorded at different locations on and inside the brain to starting from the impact site (coup) to the opposite site (countercoup). This was done to analyze the variations of ICP and MSS through the brain in order to understand the role of these parameters in injury mechanisms. The impact severity was shown to have more effect on the level of pressure response while its effect on peak MSS was not much. ICP variation was linear between coup and countercoup sites. It was observed that unlike pressure, shear stress traveled slower through the brain tissue. Our findings suggested that using only one biomechanical parameter canu2019t justify the fidelity of the FE head models.
Author: W. King
Publisher: Springer Science & Business Media
ISBN: 1475715021
Category : Technology & Engineering
Languages : en
Pages : 401
Get Book Here
Book Description
Author: Yuan Feng
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 147
Get Book Here
Book Description
Traumatic brain injury is an important medical problem affecting millions of people. Mathematical models of brain biomechanics are being developed to simulate the mechanics of brain injury and to design protective devices. However, because of a lack of quantitative data on brain-skull boundary conditions and deformations, the predictions of mathematical models remain uncertain. The objectives of this dissertation are to develop methods and obtain experimental data that will be used to parameterize and validate models of traumatic brain injury. To that end, this dissertation first addresses the brain-skull boundary conditions by measuring human brain motion using tagged magnetic resonance imaging. Magnetic resonance elastography was performed in the ferret brain to measure its mechanical properties in vivo. Brain tissue is not only heterogeneous, but may also be anisotropic. To characterize tissue anisotropy, an experimental procedure combining both shear testing and indentation was developed and applied to white matter and gray matter. These measurements of brain-skull interactions and mechanical properties of the brain will be valuable in the development and validation of finite element simulations of brain biomechanics.
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Aerospace Medical Panel. Specialists' Meeting
Publisher:
ISBN:
Category : Crash injuries
Languages : en
Pages : 252
Get Book Here
Book Description
