Improvement in Crashworthiness of a Vehicle for Side Impact Occupant Protection Using IMPAXX and Polyurethane High Energy-absorbing Foam Materials PDF Download
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Author: Saketh Reddy Muthyala Publisher: ISBN: Category : Electronic dissertations Languages : en Pages : 72
Book Description
Side impact car crashes account for roughly 30% of all fatalities in road accidents including passenger cars and light trucks, and they tend to have a disastrous effect on the human body than all other types of car accidents due to very less crumple zone. In consideration of all this, even in the lower end and higher end vehicle segments, active safety systems are incorporated more often for side impact protection. However, there is still a large number of vehicles built without side airbags, in specific regions such as North America and emerging markets. Therefore, it is still necessary to engineer passive safety measurement by utilizing safety countermeasures, such as foams solutions to protect the occupant during side impact collisions. The present study is focused on investigation of the advantage of applying high efficient energy absorption foams for side impact protection of car occupants. First, the characteristics of high energy absorbing foam models are examined by finite element analysis and simulations of the Drop Tower Tests and the Free Motion Headform tests. After ensuring material models behavior, the design of the current B-pillar is altered by adding foam into its cavity. Subsequently, side impact test simulations of a typical passenger car with a moving deformable barrier, as per NHTSA and IIHS safety regulations, with the current and modified B-pillar are conducted. In the end, various injury criteria are evaluated by positioning a ES-2re finite element dummy model with, a three-point lap and shoulder seat belt into the driver seat. The study demonstrates that the potential for the use of high-energy absorbing foam for side impact protection.
Author: Saketh Reddy Muthyala Publisher: ISBN: Category : Electronic dissertations Languages : en Pages : 72
Book Description
Side impact car crashes account for roughly 30% of all fatalities in road accidents including passenger cars and light trucks, and they tend to have a disastrous effect on the human body than all other types of car accidents due to very less crumple zone. In consideration of all this, even in the lower end and higher end vehicle segments, active safety systems are incorporated more often for side impact protection. However, there is still a large number of vehicles built without side airbags, in specific regions such as North America and emerging markets. Therefore, it is still necessary to engineer passive safety measurement by utilizing safety countermeasures, such as foams solutions to protect the occupant during side impact collisions. The present study is focused on investigation of the advantage of applying high efficient energy absorption foams for side impact protection of car occupants. First, the characteristics of high energy absorbing foam models are examined by finite element analysis and simulations of the Drop Tower Tests and the Free Motion Headform tests. After ensuring material models behavior, the design of the current B-pillar is altered by adding foam into its cavity. Subsequently, side impact test simulations of a typical passenger car with a moving deformable barrier, as per NHTSA and IIHS safety regulations, with the current and modified B-pillar are conducted. In the end, various injury criteria are evaluated by positioning a ES-2re finite element dummy model with, a three-point lap and shoulder seat belt into the driver seat. The study demonstrates that the potential for the use of high-energy absorbing foam for side impact protection.
Author: Sanjay Narayan Publisher: ISBN: Category : Electronic dissertations Languages : en Pages : 56
Book Description
Rollover crash events frequency accounts for only 3% among all types of accidents, but in terms of fatality rate, it accounts for 33% of fatalities in automobile crash accident events. Rollover events are complex and unpredictable, making them quite difficult to design a standard testing procedures. The angle of contact with the ground, the side coming into contact, height of fall, speed of vehicle, cause for rollover, etc., are all parameters and factors which could affect rollover crash responses. Presently the standard testing procedure for rollover is a quasi-static roof crush test procedure. This study details the development, analysis and computational modelling and simulation of the performance of an IMPAXX and aluminum foam and their potential as an energy absorbing material to improve the roof strength of a vehicle. First the IMPAXX foam and Aluminum foam are modelled using the LS-DYNA code, and their performances are evaluated using a drop tower test and a free motion headform test methods. Next, the IMPAXX foam and Aluminum foam are modelled for insertion in the roof A-pillar of a typical sports utility vehicle (Toyota Rav4). Quasi-static roof crush computational tests, per two different standards FMVSS 216 and IIHS are conducted on the vehicle and solved using the LS-DYNA for vehicles with and without the IMPAXX and aluminum foam. The results are analyzed and compared to quantify the effectiveness of the IMPAXX foam and aluminum foam as energy absorbing materials for rollover crashworthiness responses of vehicle and its occupant protection.
Author: Jorge A.C. Ambrosio Publisher: Springer ISBN: 3709125723 Category : Science Languages : en Pages : 462
Book Description
From the fundamentals of impact mechanics and biomechanics to modern analysis and design techniques in impact energy management and occupant protection this book provides an overview of the application of nonlinear finite elements, conceptual modeling and multibody procedures, impact biomechanics, injury mechanisms, occupant mathematical modeling, and human surrogates in crashworthiness.
Author: Society of Automotive Engineers Publisher: SAE International ISBN: 9781560911159 Category : Technology & Engineering Languages : en Pages : 146
Author: Yi Yang Tay Publisher: ISBN: Category : Electronic dissertations Languages : en Pages : 161
Book Description
The automotive industry is repeatedly tasked with improving vehicles structural strength, optimizing active and passive safety features, reducing occupant injury potential, and hitting lean manufacturing goals. The challenge is to find solutions to reduce production and research costs, and to maximize the vehicle's capability in protecting its occupants in the event of an accident. The influence of impact loading on the dynamic responses of vehicle structures and occupants require special consideration in the field of vehicle crashworthiness. The main goal of this study is to address the fundamental aspect on the impact injury biomechanics of vehicle occupants and safety performance of vehicle structures, and the development of various new technologies aimed at enhancing the passive safety of road vehicles in side-impact accidents. Four case studies related to the dissipation of crash energy, impact injury biomechanics, injury prediction model and pre-crash sensing algorithm form the basis of this thesis. The application examples include the investigation of pre-deploying airbags as a potential solution in reducing occupants' injuries at higher speed side-impact crashes; examination of the vehicle structural responses with the inclusion of high-energy absorbing cellular materials within the door panels in side-impact accidents; development of injury prediction model to out-of-position occupants from frontal- and side- airbags using Design-of-Experiment methodologies; and the estimation of the relative driver fatality risks of two colliding vehicles using some quantitative measurements. A detailed methodology is developed for each application, and the results present several new technologies that can be implemented to enhance the safety performance of road vehicles. These goals are achieved through the use of finite element approaches, multi-body dynamic analyses and Design-of-Experiment statistical methods.
Author: Saketh Reddy Muthyala
Author: Saketh Reddy Muthyala
Author: Sanjay Narayan
Author: Jorge A.C. Ambrosio
Author: Laura Lynn Liptai
Author: Society of Automotive Engineers
Author: Yi Yang Tay
Author: G. F. Syrowik
Author: 
Author: Patrick Michael Miller
Author: