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Prediction Of Fire Damage To Composite Aircraft Structures
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Book Synopsis Prediction of Fire Damage to Composite Aircraft Structures by : Hugh L. N. McManus
Download or read book Prediction of Fire Damage to Composite Aircraft Structures written by Hugh L. N. McManus and published by . This book was released on 1993 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The response of advanced composite structures to fire was investigated. An analytical technique originally developed for ablative materials was adapted to this problem. The technique includes calculation of heat transfer, chemical degradation, production and flow of decomposition gasses and resulting internal pressures, stresses, and failure. Sample analyses illustrated the behavior of composite structures exposed to fire. Simple experiments qualitatively confirmed the analytic results, and provided additional insights. Advantages of composite structures included very long bum-through times, and self insulation of thick structures through blistering. Disadvantages included vulnerability of thin structures and creation of difficult to detect impact-like damage from even brief exposure to fire. Keywords: composite materials, analytical methods, numerical models, fire, high temperatures, damage, aircraft structures, safety.
Book Synopsis Fire Properties of Polymer Composite Materials by : A. P. Mouritz
Download or read book Fire Properties of Polymer Composite Materials written by A. P. Mouritz and published by Springer Science & Business Media. This book was released on 2007-01-30 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first to deal with the important topic of the fire behaviour of fibre reinforced polymer composite materials. The book covers all of the key issues on the behaviour of composites in a fire. Also covered are fire protection materials for composites, fire properties of nanocomposites, fire safety regulations and standards, fire test methods, and health hazards from burning composites.
Book Synopsis Conference on Characterization and NDE of Heat Damage in Graphite Epoxy Composites by :
Download or read book Conference on Characterization and NDE of Heat Damage in Graphite Epoxy Composites written by and published by . This book was released on 1993 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Damage Accumulation in Composites by : D. A. Ulman
Download or read book Damage Accumulation in Composites written by D. A. Ulman and published by . This book was released on 1985 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increased use of advanced fibrous composite materials for aircraft structures necessitates the creation of an effective life prediction methodology. The establishment of life prediction procedures is the objective of this AFWAL/FDL-sponsored program. These life prediction methodologies are founded upon the experimentally documented damage accumulation process, and the reduction in material stiffness that is associated with the development of damage. The required information has been generated through an extensive experimental program. The damage accumulation process and subsequent stiffness change have been documented under a wide variety of load conditions. The chronology and correlations between the observed damage state and laminate stiffness provide a foundation for the understanding of the basic mechanisms that control the strength and life of composite aircraft components. This report consists of two volumes. Volume 1 contains a summary of the test results as well as information pertinent to the development and validation of the life prediction procedures. The second volume contains seven appendices which include detailed test results.
Book Synopsis Nondestructive Characterization of Materials VI by : Robert E. Green
Download or read book Nondestructive Characterization of Materials VI written by Robert E. Green and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traditionally the vast majority of materials characterization techniques have been destructive, e. g. , chemical compositional analysis, metallographic determination of microstructure, tensile test measurement of mechanical properties, etc. Also, traditionally, nondestructive techniques have been used almost exclusively for the detection of macroscopic defects, mostly cracks, in structures and devices which have already been constructed and have already been in service for an extended period of time. Following these conventional nondestructive tests, it has been common practice to use somewhat arbitrary accept-reject criteria to decide whether or not the structure or device should be removed from service. The present unfavorable status of a large segment of industry, coupled with the desire to keep structures in service well past their original design life, dramatically show that our traditional approaches must be drastically modified if we are to be able to meet future needs. The role of nondestructive characterization of materials is changing and will continue to change dramatically. It has become increasingly evident that it is both practical and cost effective to expand the role of nondestructive evaluation to include all aspects of materials' production and application and to introduce it much earlier in the manufacturing cycle. In fact, the recovery of a large portion of industry from severe economic problems is dependent, in part, on the successful implementation of this expanded role.
Book Synopsis Course On Emerging Techniques For Damage Prediction And Failure Analysis Of Laminated Composite Structures by : Éditions Cépaduès
Download or read book Course On Emerging Techniques For Damage Prediction And Failure Analysis Of Laminated Composite Structures written by Éditions Cépaduès and published by Éditions Cépaduès. This book was released on 2008-01-08 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The course deals with the crucial central question: how can one predict the evolution of damage up to and including final fracture ?Emerging yet mature answers will be presented. First, a description of today's common approaches in industrial environments will be given, along with their limits regarding the design and calculation of stratified composite structures. The course also emphasizes the damage mesomodel initiated at LMT-Cachan and used today in a number of calculation codes. This advanced yet pragmatic tool for the prediction of damage in stratified materials has become mature thanks particularly to the works of LMT-Cachan on its relation to micromechanics, EADS-Innovation Works on its identification, and DLR on its application to impact and crash problems. The course aims to give engineers and researchers the most complete view possible of the state-of-the-art and emerging techniques in damage prediction and failure analysis of laminated composite structures.
Book Synopsis Composite Materials by : Ravi B. Deo
Download or read book Composite Materials written by Ravi B. Deo and published by ASTM International. This book was released on 1996 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Damage Accumulation in Composites by : D. A. Ulman
Download or read book Damage Accumulation in Composites written by D. A. Ulman and published by . This book was released on 1985 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increased use of advanced fibrous composite materials for aircraft structures necessitates the creation of an effective life prediction methodology. The establishment of life prediction procedures is the objective of this AFWAL/FDL-sponsored program. These life prediction methodologies are founded upon the experimentally documented damage accumulation process, and the reduction in material stiffness that is associated with the development of damage. The required information has been generated through an extensive experimental program. The damage accumulation process and subsequent stiffness change have been documented under a wide variety of load conditions. The chronology and correlations between the observed damage state and laminate stiffness provide a foundation for the understanding of the basic mechanisms that control the strength and life of composite aircraft components. This report consists of two volumes. Volume 1 contains a summary of the test results as well as information pertinent to the development and validation of the life prediction procedures. The second volume contains seven appendices which include detailed test results.
Book Synopsis Metal Matrix Composites by : International Conference on Composite Materials
Download or read book Metal Matrix Composites written by International Conference on Composite Materials and published by Woodhead Publishing. This book was released on 1993 with total page 940 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Research in Materials written by and published by . This book was released on 1994 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Reference Publication written by and published by . This book was released on 1977 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental and Numerical Investigation of Wide Area Blunt Impact Damage to Composite Aircraft Structures by : Zhi Ming Chen
Download or read book Experimental and Numerical Investigation of Wide Area Blunt Impact Damage to Composite Aircraft Structures written by Zhi Ming Chen and published by . This book was released on 2015 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to their high performance and weight efficiency, carbon fiber composites are increasingly being used in aircraft primary structure applications. Exposed composite structures (e.g., fuselage lower body) are susceptible accidental impacts by ground service equipment (GSE). The very high mass (over 10,000 kg) of GSE impact can involve high energy (over 1000 J) and thus can induce significant internal damage. Furthermore, the large contact area potentially involved with GSE impact can create significant internal delamination and fiber failure without leaving exterior-visible signs that any damage has occurred. The objectives of the research described herein are to : (1) conduct experimental investigation into the composite aircraft damage caused by GSE impact, (2) examine the small-scale failure modes in focused, element-level studies, (3) establish a finite element modeling methodology involving detailed simulation capability that is validated via small-scale tests, and (4) apply these modeling capabilities to accurately predict full-scale structural behavior without adjustment (e.g., tuning) of modeling input parameters.
Book Synopsis Enhanced Reliability Prediction Methodology for Impact Damaged Composite Structures by : H. P. Kan
Download or read book Enhanced Reliability Prediction Methodology for Impact Damaged Composite Structures written by H. P. Kan and published by . This book was released on 1998 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: A through review of the existing impact test data and analysis methods was conducted and the results were used to identify a reliability prediction methodology for further development. The integrated residual strength/reliability method developed by Northrop Grumman under a Navy/Federal Aviation Administration sponsored program was selected and modified. The modification was primarily in reducing the number of empirical constants required in the model. In addition, a cutoff energy level and a threshold energy level were also established analytically for the strength prediction. A structural damage tolerance evaluation was conducted using the modified model and the results compared to those obtained from the existing model.
Book Synopsis Composite Aircraft Structure by : United States. Federal Aviation Administration
Download or read book Composite Aircraft Structure written by United States. Federal Aviation Administration and published by . This book was released on 1984 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Fire Damage to Composite Materials by : Lauren Kathleen Kucner
Download or read book Experimental Investigation of Fire Damage to Composite Materials written by Lauren Kathleen Kucner and published by . This book was released on 1995 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composites used in aeronautical and naval structures can be exposed to accidental fires which may have a detrimental effect on their integrity. The goals of the present investigation are to establish a framework through which the issue of fire damage to composite materials can be evaluated, to conduct a thorough review of previous work on the topic, to supplement previous knowledge through experimentation and analysis, and to develop a succinct description of the current level of understanding of this subject. An experimental investigation is undertaken to study the physical changes that occur within AS4/3501-6 graphite/epoxy composites as a result of exposure to a propane flame. Visual observation of the exterior and cross-sections of the specimens, optical microscopy, and planimetric measurements of the area of matrix loss on the exposed face of the laminates provide information regarding how the extent of damage varies with the time of exposure. Mass loss is measured. Microscopic examinations and microhardness tests are used to survey the distribution of charring throughout cross-sections of burned laminates. The relationships between damage to the material and changes in structural behavior are investigated by a study of the loss of tensile strength of graphite/epoxy coupons burned in a circular area in the center of the panel. Comparison of tensile test results with calculated tensile strengths of coupons with various geometries provides insight into the structural damage mechanisms. This research is supplemented by analysis of results obtained from fire damage research conducted by teams of undergraduate investigators, including temperature distribution measurements and tests of sandwich panels. Thermocouple data and measurements of the depth of char within specimens is correlated with analytical results from a predictive code. Analytical temperature and char depth predictions are satisfactory, although better material data is needed and, in some cases, a more complex 2- or 3-D analysis is called for. The temperature range in which charring begins and material properties permanently change is identified. The structural behavior of tensile coupons with centrally-located circular burns cannot be explained by existing analytical models. The structural behavior of sandwich panels is more fully understood.
