Download or read book Simulation of Traumatic Brain Injury in Children Using Finite Element Modeling written by Ziman Cheng and published by . This book was released on 2017 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traumatic brain injury is the main cause of disability and death in children and infants. This thesis focuses on establishing the consequences of an external force or impact on brain tissues. FE model has been introduced to investigate the consequences of impact force, either dynamic or static, onto the infant brain. Deformable meshes are involved in FE models to generate time-dependent pressure change in various brain tissues. Results demonstrate that our finite element model is capable of investigating brain tissue pressure transmission within certain impact force and can be used for simulation of minor brain injury in infants.

Download or read book Head Injury Biomechanics in Toddlers written by Nicole Gabriel Ibrahim and published by . This book was released on 2009 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pediatric head injury is the most common cause of death among US children. Depending on the brain injury, the literature offers conflicting evidence for an increased or decreased vulnerability in the toddler compared to the infant. We combined clinical data of head injuries in infants and toddlers with anthropomorphic dummy studies, animal experiments and finite element model simulations to systematically identify differences in vulnerability to traumatic head injury in infants and toddlers. We found that among infants and toddlers hospitalized for accidental head trauma, significantly more infants sustained a skull fracture compared to toddlers whereas toddlers presented with neurological impairment more frequently than infants, demonstrating unique injuries across age ...

Download or read book Impact Biomechanics written by Society of Automotive Engineers and published by SAE International. This book was released on 2002 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thirteen papers from the biomechanics technical sessions of the 2002 SAE congress use laboratory experiments, computer models, and field data to evaluate the human body's kinematics, kinetics, and injury potential in response to impact loads caused by automobile accidents. Topics include finite elem

Download or read book Head Injury Simulation in Road Traffic Accidents written by Fábio A. O. Fernandes and published by Springer. This book was released on 2018-04-27 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work the development of a new geometrically detailed finite element head model is presented. Special attention is given to sulci and gyri modelling, making this model more geometrically accurate than others currently available. The model was validated against experimental data from impact tests on cadavers, specifically intracranial pressure and brain motion. Its potential is shown in an accident reconstruction case with injury evaluation by effectively combining multibody kinematics and finite element methodology.

Download or read book Biomechanical Analysis of Traumatic Brain Injury by MRI based Finite Element Modeling written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Finite Element Head Injury Model Theory development and results written by T. A. Shugar and published by . This book was released on 1977 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Finite Element Head Injury Model Volume I Theory Development and Results Final Report written by T. A. Shugar and published by . This book was released on 1977 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Traumatic Brain Injury written by Rajkumar Prabhu and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The brain is a complex organ and its response to the mechanical loads at all strain rates has been nonlinear and inelastic in nature. Split-Hopkinson Pressure Bar (SHPB) high strain rate compressive tests conducted on porcine brain samples showed a strain rate dependent inelastic mechanical behavior. Finite Element (FE) modeling of the SHPB setup in ABAQUS/Explicit, using a specific constitutive model (MSU TP Ver. 1.1) for the brain, showed non-uniform stress state during tissue deformation. Song et al.'s assertion of using annular samples for negating inertial effects was also tested. FE simulation results showed that the use of cylindrical or annular did not mitigate the initial hardening. Further uniaxial stress state was not maintained in either case. Experimental studies on hydration effects of the porcine brain on its mechanical response revealed two different phenomenological trends. The wet brain (~80% water wt./wt.) showed strain rate dependency along with two unique mechanical behavior patterns at quasi-static and high strain rates. The dry brain's (~0% water wt./wt.) response was akin to the response of metals. The dry brain's response also observed to be strain rate insensitivity in its Template 2009 elastic modulus and yield stress variations. Uncertainty analysis of the wet brain high strain rate data revealed large uncertainty bands for the sample-to-sample random variations. This large uncertainty in the brain material should be taken into in the FE modeling and design stages. FE simulations of blast loads to the human head showed that Pressure played a dominant role in causing blast-related Traumatic Brain Injury (bTBI). Further, the analysis of shock waves exposed the deleterious effect of the 3-Dimensional geometry of the skull in pinning the location of bTBI. The effects of peak negative Pressure at injury sites have been attributed to bTBI pathologies such as Diffuse Axonal Injury (DAI), subdural hemorrhage and cerebral contusion.

Download or read book Finite Element Modeling of Brain Injury for Performance Evaluation of Football Helmets written by Derek Wallin and published by . This book was released on 2018 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Football helmets worn today are primarily designed to prevent skull fracture and irreversible brain injury. In that limited respect, today’s helmets are a success with the frequency of reported football-related skull fracture a rare occurrence. In recent decades, however, concussion, mild traumatic brain injury (mTBI), and chronic traumatic encephalopathy (CTE) are being reported with increasing incidence. Helmet manufacturing companies are limited in their performance analysis of helmets, with no standard helmet testing procedures incorporating anatomical data or physiological weaknesses of the brain. Finite Element Modeling of the brain has allowed for analysis of the mechanics of brain injury and can provide injury metrics based on simulated brain injury. In this study the background on current helmet testing procedures is provided as well as a finite element study of brain injury to determine helmet performance. In addition, this modeling will be used to identify what types of impacts are most dangerous.

Download or read book Using Finite Element Modeling to Analyze Injury Thresholds of Traumatic Brain Injury from written by Anna Marie Dulaney and published by . This book was released on 2018 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: A finite element model was developed for a range of human head-sUAS impacts to provide multiple case scenarios of impact severity at two response regions of interest: global and local. The hypothesis was that for certain impact scenarios, local response injuries of the brain (frontal, parietal, occipital, temporal lobes, and cerebellum) have a higher severity level compared to global response injury, the response at the Center of Gravity (CG) of the head. This study is the first one to predict and quantify the influence of impact parameters such as impact velocity, location, offset, and angle of impact to severity of injury. The findings show that an sUAS has the potential of causing minimal harm under certain impact scenarios, while other scenarios cause fatal injuries. Additionally, results indicate that the human head’s global response as a less viable response region of interest when measuring injury severity for clinical diagnosis. It is hoped that the results from this research can be useful to assist decision making for treatments and may offer different perspectives in sUAS designs or operation environments.

Download or read book Finite Element Analysis of Traumatic Brain Injury Due to Small Unmanned Aircraft System sUAS Impacts on the Human Head written by Alex Nelson Smith and published by . This book was released on 2019 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: A biofidelic finite element model was developed from an acquired set of CT scans for a range of human head and UAS impacts to provide simulations of multiple velocity scenarios of impact severity at four impact orientations on the human head. The hypothesis was that a correlation existed between the total amounts of kinetic energy of the impact from the UAS and human head collision, as well as that location of impact plays a role in the injury risk sustained. Linear acceleration, angular velocity, and pressure data values were calculated for each individual simulated case and then further correlated to injury risks that represent the severity of damage that would be sustained from the collision. Resulting data proved to show that impact kinetic energy, impact orientation, and impact response of the head and UAS all play vital roles in the amount of damage that is sustained from the impact collisions.

Download or read book Finite Element Modeling of Human Brain Response to Football Helmet Impacts written by Timothy Darling and published by . This book was released on 2014 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: The football helmet is a device used to help mitigate the occurrence of impact-related traumatic (TBI) and minor traumatic brain injuries (mTBI) in the game of American football. The current design methodology of using a hard shell with an energy absorbing liner may be adequate for minimizing TBI, however it has had less effect in minimizing mTBI. The latest research in brain injury mechanisms has established that the current design methodology has produced a helmet to reduce linear acceleration of the head. However, angular accelerations also have an adverse effect on the brain response, and must be investigated as a contributor of brain injury. To help better understand how the football helmet design features effect the brain response during impact, this research develops a validated football helmet model and couples it with a full LS-DYNA human body model developed by the Global Human Body Modeling Consortium (v4.1.1). The human body model is a conglomeration of several validated models of different sections of the body. Of particular interest for this research is the Wayne State University Head Injury Model for modeling the brain. These human body models were validated using a combination of cadaveric and animal studies. In this study, the football helmet was validated by laboratory testing using drop tests on the crown of the helmet. By coupling the two models into one finite element model, the brain response to impact loads caused by helmet design features can be investigated. In the present research, LS-DYNA is used to study a helmet crown impact with a rigid steel plate so as to obtain the strain-rate, strain, and stress experienced in the corpus callosum, midbrain, and brain stem as these anatomical regions are areas of concern with respect to mTBI.

Download or read book Multiscale Biomechanical Modeling of the Brain written by Mark F. Horstemeyer and published by Academic Press. This book was released on 2021-10-27 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiscale Biomechanical Modeling of the Brain discusses the constitutive modeling of the brain at various length scales (nanoscale, microscale, mesoscale, macroscale and structural scale). In each scale, the book describes the state-of-the- experimental and computational tools used to quantify critical deformational information at each length scale. Then, at the structural scale, several user-based constitutive material models are presented, along with real-world boundary value problems. Lastly, design and optimization concepts are presented for use in occupant-centric design frameworks. This book is useful for both academia and industry applications that cover basic science aspects or applied research in head and brain protection.The multiscale approach to this topic is unique, and not found in other books. It includes meticulously selected materials that aim to connect the mechanistic analysis of the brain tissue at size scales ranging from subcellular to organ levels. - Presents concepts in a theoretical and thermodynamic framework for each length scale - Teaches readers not only how to use an existing multiscale model for each brain but also how to develop a new multiscale model - Takes an integrated experimental-computational approach and gives structured multiscale coverage of the problems

Download or read book Neural Tissue Biomechanics written by Lynne E. Bilston and published by Springer Science & Business Media. This book was released on 2011-07-23 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Damage to the central nervous system resulting from pathological mechanical loading can occur as a result of trauma or disease. Such injuries lead to significant disability and mortality. The peripheral nervous system, while also subject to injury from trauma and disease, also transduces physiological loading to give rise to sensation, and mechanotransduction is also thought to play a role in neural development and growth. This book gives a complete and quantitative description of the fundamental mechanical properties of neural tissues, and their responses to both physiological and pathological loading. This book reviews the methods used to characterize the nonlinear viscoelastic properties of central and peripheral neural tissues, and the mathematical and sophisticated computational models used to describe this behaviour. Mechanisms and models of neural injury from both trauma and disease are reviewed from the molecular to macroscopic scale. The book provides a comprehensive picture of the mechanical and biological response of neural tissues to the full spectrum of mechanical loading to which they are exposed. This book provides a comprehensive reference for professionals involved in pre prevention of injury to the nervous system, whether this arises from trauma or disease.

Download or read book Transcranial Direct Current Stimulation in Neuropsychiatric Disorders written by André R. Brunoni and published by Springer Nature. This book was released on 2021-09-20 with total page 779 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2nd edition of this book incorporates the tremendous clinical advances that have occurred in the field of transcranial direct current stimulation (tDCS) over the past 5 years. Since the 1st edition was published, the clinical use of tDCS has moved from its infancy, and is now in a thrilling new phase with numerous possibilities as well as challenges. tDCS is a technique that excels in terms of safety and tolerability, and within a few years, novel technological developments will allow its use at home. At the same time, large, phase III trials have been exploring the clinical efficacy of tDCS, the results of which have been published in leading journals such as the New England Journal of Medicine and JAMA Psychiatry. This 2nd edition summarizes the state of the art of the field. Written by leading experts in the field, the book is divided into 5 parts: Introduction and Mechanisms of Action; Research Methods; tDCS in the life cycle; Applications of tDCS in neuropsychiatric disorders (further divided into Psychiatry and Neurology); and The clinical use of tDCS. It also includes several new chapters, covering topics such as precision stimulation of tDCS; combination of tDCS with different neuroimaging modalities; and use of tDCS in new clinical conditions. Moreover, all chapters have been rewritten and updated. This book will be of significant interest to psychiatrists, neurologists and neuroscientists new to the field as well as those with a background in tDCS who want to increase their understanding of particular psychiatric conditions.

Download or read book Modeling the Biodynamical Response of the Human Head for Injury Analysis written by Danielle N. George and published by . This book was released on 2001-09-01 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to develop a finite element model of the human head and neck to investigate the biomechanics of head injury. The finite element model is a two-dimensional, plane strain representation of the cervical spine, skull, and major components of the brain including the cerebrum, cerebellum, brain stem, tentorium and the surrounding cerebral spinal fluid. The dynamic response of the model is validated by comparison with the results of human volunteer sled acceleration experiments conducted by Ewing et al. 10 . To validate the head model, one of the head impact experiments performed on cadavers by Nahum et al. 24, is simulated. The model responses are compared with the measured cadaveric test data in terms of head acceleration, and intracranial pressures measured at four locations including the coup and contrecoup sites. The validated model is used to demonstrate that the Head Injury Criterion (HIC), which is based on resultant translational acceleration of the center of gravity of the head, does not relate to the various mechanisms of brain injury and is therefore insufficient in predicting brain injury.

Download or read book Topics in Modal Analysis I Volume 7 written by James De Clerck and published by Springer Science & Business. This book was released on 2014-04-28 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: This seventh volume of eight from the IMAC - XXXII Conference, brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Structural Dynamics, including papers on: Linear Systems Substructure Modelling Adaptive Structures Experimental Techniques Analytical Methods Damage Detection Damping of Materials & Members Modal Parameter Identification Modal Testing Methods System Identification Active Control Modal Parameter Estimation Processing Modal Data