Modeling Cables and Impactors in Crash Analysis
Modeling Cables and Impactors in Crash Analysis

Author: Michael Eric Martin

Publisher:

Published: 2009

Total Pages: 270

ISBN-13:

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Cable median barriers (CMBs) have become a popular roadside safety device for preventing cross-median collisions. It is common to model barrier collisions using finite element analysis (FEA). One of the most important and difficult interactions to model is the interaction between the vehicle and the cables. Currently used cable models incorporate null shells as contact surfaces around beam elements that often cause snagging with the vehicle's components and can exhibit unrealistic contact behavior. Since LS-DYNA supports direct contact definitions with beam elements, it would be ideal to model cables with only beam elements to reduce the number of elements and thus the computational cost. An analytical program is presented to validate both the current cable model and the new one based only on beam contacts. Results from finite element (FE) static and dynamic simulations are presented and compared to closed-form solutions to verify the current and new cable models. A rigid bar-rigid impactor problem is presented to validate and compare the contact behavior when various contact definitions and contact interfaces are implemented. FE simulations of an impactor-cable system are also presented to examine contact interactions when one of the bodies is flexible. These impact simulation results are compared to closed-form analyses. Finally, full-scale FE CMB crash simulations are performed using both contact strategies. The results are compared and simulation durations for each model are also presented. It is shown that the use of null shells for contact purposes is not necessary, since they increase computational cost and are responsible for inaccuracies and instabilities in the models.

Vehicle Crash Mechanics
Vehicle Crash Mechanics

Author: Matthew Huang

Publisher: CRC Press

Published: 2002-06-19

Total Pages: 499

ISBN-13: 142004186X

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Governed by strict regulations and the intricate balance of complex interactions among variables, the application of mechanics to vehicle crashworthiness is not a simple task. It demands a solid understanding of the fundamentals, careful analysis, and practical knowledge of the tools and techniques of that analysis. Vehicle Crash Mechanics s

Structures Under Shock and Impact XI
Structures Under Shock and Impact XI

Author: Norman Jones

Publisher: WIT Press

Published: 2010

Total Pages: 369

ISBN-13: 1845644662

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This text examines the interaction between blast pressure and surface or underground structures, whether the blast is from civilian, military, dust and natural explosions, or any other source.

Dynamics and Aerodynamics of Cables
Dynamics and Aerodynamics of Cables

Author: Vincenzo Gattulli

Publisher: Springer Nature

Published: 2024-01-17

Total Pages: 363

ISBN-13: 3031471520

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This volume gathers the latest advances, innovations and applications in the field of cable dynamics and aerodynamics, as presented by leading researchers and engineers at the 3rd International Symposium on Dynamics and Aerodynamics of Cables (ISDAC), held in Rome, Italy on June 15-17, 2023. The contributions encompass topics such as nonlinear cable dynamics, cable structures and moving cables, cable aging, fatigue, degradation and failure mechanisms, laboratory testing of cable dynamics and aerodynamics, computational models for cable dynamics and fluid-structure interaction, cable vibration control, cable driven parallel manipulators, monitoring of cable performance, environmental and anthropic loads on cable structures. The contributions, which were selected through a rigorous international peer-review process, share exciting ideas that will spur novel research directions and foster new multidisciplinary collaborations.

Crash Reconstruction Research
Crash Reconstruction Research

Author: Michael S Varat

Publisher: SAE International

Published: 2008-03-17

Total Pages: 770

ISBN-13: 0768020522

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The science of crash reconstruction enables engineers to determine the most probable scenario for how and why traffic collisions occur. Ongoing research has continually enhanced crash reconstructionists' knowledge of the application of physical laws in this field. Crash Reconstruction Research: 20 Years of Progress (1988-2007) features 47 papers that have presented significant steps forward, focusing on the following areas within the field of crash reconstruction that have experienced major advances: Planar Impact Mechanics Stiffness Modeling Crash Pulse Analysis Structural Restitution Lateral Deformation and Override/Underride BEV v. Delta-V Rear and Side Impacts Pole Impacts Uncertainty Analysis Pedestrian Crashes Braking Performance

Materials and Contact Characterisation IX
Materials and Contact Characterisation IX

Author: S. Hernández

Publisher: WIT Press

Published: 2019-07-23

Total Pages: 287

ISBN-13: 178466331X

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Including papers from the 9th edition of the International Conference on Computational Methods and Experiments in Material and Contact Characterisation this volume presents the work of selected researchers on the subject. Material and contact characterisation is a rapidly advancing field and this volume contains the latest research. Of particular interest to industry and society is the knowledge of surface treatment and contact mechanics of these materials to determine the in-service behaviour of components subject to contact conditions. Modern society requires systems that operate at conditions that use resources effectively. In terms of components durability, the understanding of surface engineering wear frictional and lubrication dynamics has never been so important. Current research is focussed on modification technologies that can increase the surface durability of materials. The characteristics of the system reveal which surface engineering methods should be chosen and as a consequence it is essential to study the combination of surface treatment and contact mechanics. The accurate characterisation of the physical and chemical properties of materials requires the application of both experimental techniques and computer simulation methods in order to gain a correct analysis. A very wide range of materials, starting with metals through polymers and semiconductors to composites, necessitates a whole spectrum of characteristic experimental techniques and research methods. The papers in the book cover a number of topics, including: Computer methods and simulation; Experimental and measurement techniques; Mechanical characterisation and testing; Materials under extreme conditions; Polymers and plastics; Advances in composites; Micro and macro characterisation; Corrosion and erosion; Damage, fatigue and fracture; Recycled materials; Materials and energy; Surface problems and contact mechanics; Surface modification and treatments; Thick and thin coatings; Tribomechanics and wear mechanics; Biomechanical characterisation; Biomechanical applications and Case studies.