Design Load Allowables For Composite Plates Exposed To Thermomechanical Loads
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Design Load Allowables For Composite Plates Exposed To Thermomechanical Loads
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Author : Martin Liebisch
language : en
Publisher: Springer Nature
Release Date : 2024-11-29
Design Load Allowables For Composite Plates Exposed To Thermomechanical Loads written by Martin Liebisch and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-11-29 with Mathematics categories.
Current methodologies used to design lightweight structures made of CFRP materials under static thermomechanical conditions often rely on simplified approaches. In particular, the temperature-related design case is typically described by assuming a uniform distribution of the worst-case temperature, which is the maximum allowable temperature that can occur simultaneously with the mechanical loads. However, these simplifications can lead to a weight penalty due to their over-conservatism. To address these limitations, the present work describes a novel analysis methodology that accounts for spatial distributions of temperature. This approach allows for a more detailed understanding of the structural behavior under these demanding conditions. As a result, existing load-carrying potentials can be identified and used to fully exploit the advantage of CFRP structures. Moreover, this methodology generates an improved understanding of the variability in the structural behavior under such scattering thermal conditions, which can increase confidence and reliability in the design process and lead to reduce related margins of safety. To accurately model the mechanical behavior of structures at distributed temperature conditions, it is essential to consider the temperature-dependent properties of the material. These properties describing the elastic and strength behavior of the unidirectional ply, are derived from typical material characterization performed at various temperatures. In this approach, a phenomenological model is used to account for the temperature dependence of the material. This model is fitted to the characterization results to consider the individual magnitude of the properties. The resulting property allowables contain typical material uncertainties, as well as the model uncertainty that is defined by assessing the errors between the model and measurement. To determine the stability and strength behavior of structures under different thermal conditions, Finite-Element-Analysis (FEA) is utilized. Variations of thermal load distributions are analyzed to consider the uncertainty in opertational conditions qualitatively and quantitatively. A series of such analyses is conducted at different thermal conditions to determine design values such as buckling loads or failure loads. Based on this data, surrogate modeling leads to design value formulation as a function of the temperature distribution. This approach provides a more comprehensive and reliable assessment of the structural behavior under different thermal conditions and enables to either determine more realistic worst-case behavior or enhanced design values such as probabilistic structural allowables. The final part of the thesis demonstrates the developed analysis methodology on representative skin field structures. The comparison to the common analysis procedure highlights the potentials of structural load carrying capability and reveals deficiencies in the present approach. Thus, a detailed modelling of the temperature distribution leads additionally to an improved reliability of the design process and more efficient and robust structures.
Failure Mechanisms In Polymer Matrix Composites
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Author : Paul Robinson
language : en
Publisher: Elsevier
Release Date : 2012-01-19
Failure Mechanisms In Polymer Matrix Composites written by Paul Robinson and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-01-19 with Technology & Engineering categories.
Polymer matrix composites are increasingly replacing traditional materials, such as metals, for applications in the aerospace, automotive and marine industries. Because of the relatively recent development of these composites there is extensive on-going research to improve the understanding and modelling of their behaviour – particularly their failure processes. As a consequence there is a strong demand among design engineers for the latest information on this behaviour in order to fully exploit the potential of these materials for a wide range of weight-sensitive applications. Failure mechanisms in polymer matrix composites explores the main types of composite failure and examines their implications in specific applications.Part one discusses various failure mechanisms, including a consideration of manufacturing defects and addressing a variety of loading forms such as impact and the implications for structural integrity. This part also reviews testing techniques and modelling methods for predicting potential failure in composites. Part two investigates the effects of polymer-matrix composite failure in a range of industries including aerospace, automotive and other transport, defence, marine and off-shore applications. Recycling issues and environmental factors affecting the use of composite materials are also considered.With its distinguished editors and international team of expert contributors Failure mechanisms in polymer matrix composites is a valuable reference for designers, scientists and research and development managers working in the increasing range of industries in which composite materials are extensively used. The book will also be a useful guide for academics studying in the composites field. - Discusses various failure mechanisms, including manufacturing defects - Reviews testing techniques and modelling methods for predicting potential failure - Investigates failure in aerospace, automotive, defence, marine and off-shore applications
International Aerospace Abstracts
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Author :
language : en
Publisher:
Release Date : 1997
International Aerospace Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Aeronautics categories.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1987
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Mechanics, Applied categories.
Direct Methods For Limit States In Structures And Materials
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Author : Konstantinos Spiliopoulos
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-08-13
Direct Methods For Limit States In Structures And Materials written by Konstantinos Spiliopoulos and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-08-13 with Technology & Engineering categories.
Knowing the safety factor for limit states such as plastic collapse, low cycle fatigue or ratcheting is always a major design consideration for civil and mechanical engineering structures that are subjected to loads. Direct methods of limit or shakedown analysis that proceed to directly find the limit states offer a better alternative than exact time-stepping calculations as, on one hand, an exact loading history is scarcely known, and on the other they are much less time-consuming. This book presents the state of the art on various topics concerning these methods, such as theoretical advances in limit and shakedown analysis, the development of relevant algorithms and computational procedures, sophisticated modeling of inelastic material behavior like hardening, non-associated flow rules, material damage and fatigue, contact and friction, homogenization and composites.
35th Aiaa Asme Asce Ahs Asc Structures Structural Dynamics And Materials Conference
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Author :
language : en
Publisher:
Release Date : 1994
35th Aiaa Asme Asce Ahs Asc Structures Structural Dynamics And Materials Conference written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Airplanes categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1988
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Aeronautics categories.
Annual Book Of Astm Standards
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Author : American Society for Testing and Materials
language : en
Publisher:
Release Date : 1992
Annual Book Of Astm Standards written by American Society for Testing and Materials and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Materials categories.
Technical Abstract Bulletin
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Author :
language : en
Publisher:
Release Date :
Technical Abstract Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Science categories.
Engineered Materials Abstracts
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Author :
language : en
Publisher:
Release Date : 1989-09
Engineered Materials Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989-09 with Ceramic materials categories.