Author:
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 24

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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722602734
Category :
Languages : en
Pages : 24

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Book Description
A methodology to compute cumulative probability distribution functions (CDF) of fatigue life for different ratios, r of applied stress to the laminate strength based on first ply failure criteria has been developed and demonstrated. Degradation effects due to long term environmental exposure and mechanical cyclic loads are considered in the simulation process. A unified time-stress dependent multi-factor interaction equation model developed at NASA Lewis Research Center has been used to account for the degradation/aging of material properties due to cyclic loads. Fast probability integration method is used to perform probabilistic simulation of uncertainties. Sensitivity of fatigue life reliability to uncertainties in the primitive random variables are computed and their significance in the reliability based design for maximum life is discussed. The results show that the graphite/epoxy (0/+45/90) deg laminate with ply thickness 0.125 in. has 500,000 cycles life for applied stress to laminate strength ratio of 0.6 and a reliability of 0.999. Also, the fatigue life reliability has been found to be most sensitive to the ply thickness and matrix tensile strength. Tighter quality controls must therefore be enforced on ply thickness and matrix strength in order to achieve high reliability of the structure. Shah, A. R. and Singhal, S. N. and Murthy, P. L. N. and Chamis, C. C. Glenn Research Center NAS3-27186; RTOP 505-62-10...

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: A. R. Shah
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 20

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Author: A. R. Shah
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 16

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Book Description

Author: Kishore V. Pochiraju
Publisher: Springer Science & Business Media
ISBN: 1441993088
Category : Technology & Engineering
Languages : en
Pages : 681

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Book Description
Long-Term Durability of Polymeric Matrix Composites presents a comprehensive knowledge-set of matrix, fiber and interphase behavior under long-term aging conditions, theoretical modeling and experimental methods. This book covers long-term constituent behavior, predictive methodologies, experimental validation and design practice. Readers will also find a discussion of various applications, including aging air craft structures, aging civil infrastructure, in addition to engines and high temperature applications.

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 548

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Author: Kishore V. Pochiraju
Publisher: Springer
ISBN: 9781441993090
Category : Technology & Engineering
Languages : en
Pages : 677

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Book Description
Long-Term Durability of Polymeric Matrix Composites presents a comprehensive knowledge-set of matrix, fiber and interphase behavior under long-term aging conditions, theoretical modeling and experimental methods. This book covers long-term constituent behavior, predictive methodologies, experimental validation and design practice. Readers will also find a discussion of various applications, including aging air craft structures, aging civil infrastructure, in addition to engines and high temperature applications.

Author: Rui Miranda Guedes
Publisher: Woodhead Publishing
ISBN: 0081026021
Category : Technology & Engineering
Languages : en
Pages : 590

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Book Description
Creep and Fatigue in Polymer Matrix Composites, Second Edition, updates the latest research in modeling and predicting creep and fatigue in polymer matrix composites. The first part of the book reviews the modeling of viscoelastic and viscoplastic behavior as a way of predicting performance and service life. Final sections discuss techniques for modeling creep rupture and failure and how to test and predict long-term creep and fatigue in polymer matrix composites. - Reviews the latest research in modeling and predicting creep and fatigue in polymer matrix composites - Puts a specific focus on viscoelastic and viscoplastic modeling - Features the time-temperature-age superposition principle for predicting long-term response - Examines the creep rupture and damage interaction, with a particular focus on time-dependent failure criteria for the lifetime prediction of polymer matrix composite structures that are illustrated using experimental cases

Author: National Research Council
Publisher: National Academies Press
ISBN: 0309097150
Category : Technology & Engineering
Languages : en
Pages : 80

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Book Description
Advanced polymer matrix composites (PMC) have many advantages such as light weight and high specific strength that make them useful for many aerospace applications. Enormous uncertainty exists, however, in predicting long-term changes in properties of PMCs under extreme environmental conditions, which has limited their use. To help address this issue, the Department of Defense requested a study from the NRC to identify the barriers and limitations to the use of PMCs in extreme environments. The study was to focus on issues surrounding methodologies for predicting long-term performance. This report provides a review of the challenges facing application of PMCs in extreme environments, the current understanding of PMC properties and behavior, an analysis of the importance of data in developing effective models, and recommendations for improving long-term predictive methodologies.