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Modeling Considerations In The Prediction Of Residual Strength In Composite Laminates
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Book Synopsis Modeling Considerations in the Prediction of Residual Strength in Composite Laminates by : Erik Saether
Download or read book Modeling Considerations in the Prediction of Residual Strength in Composite Laminates written by Erik Saether and published by . This book was released on 1994 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Progressive Damage Model and Analysis Methodology for Predicting the Residual Strength of Composite Laminates by : CE. Harris
Download or read book A Progressive Damage Model and Analysis Methodology for Predicting the Residual Strength of Composite Laminates written by CE. Harris and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The durability and damage tolerance of laminated composites are critical design considerations for airframe composite structures. Therefore, the ability to model damage initiation and growth and predict the life of laminated composites is necessary to achieve efficient and economical structural designs. The purpose of the research presented in this paper is to experimentally verify the application of the damage model developed by the authors to predict progressive damage development in a toughened material system. Damage growth, stiffness degradation, and residual strength were experimentally determined for cross-ply and quasi-isotropic IM7/5260 graphite/bismaleimide laminates due to monotonic and tension-tension fatigue. The damage model, which has been implemented into a finite element code, was used to predict the stiffness loss and residual strength of unnotched and notched laminates. The model predictions were in good agreement to experimental results for several different fatigue loading histories and several different laminate stacking sequences.
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.
Book Synopsis RESTRAN: Residual Strength Analysis of Impact Damaged Composite Laminates. Volume I: Theoretical Manual by :
Download or read book RESTRAN: Residual Strength Analysis of Impact Damaged Composite Laminates. Volume I: Theoretical Manual written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of composite material systems in structural design has yielded significant improvements in material efficiency by minimizing weight while meeting static and dynamic strength requirements. The complexity of composite materials, however, has presented a spectrum of additional design considerations in the areas of fabrication, strength tailoring, failure mechanisms, and damage tolerance. Laminated composites exhibit a variety of damage and failure modes which include matrix cracking, fiber breakage, delamination propagation, and instability. Of prime concern is the predication of residual strength in composite structures subjected to damage-causing impact threats in the intended service environment. The present effort aims to account for many of the salient damage mechanisms utilizing a numerical, finite element-based approach. Such an approach permits a broad range of failure modes to be accounted for while allowing the modeling of complex geometries, support conditions, and applied loading. This report details the theoretical and algorithmic basis of a developed computer program denoted RESTRAN (REsidual STRength ANalysis), incorporating both material and structural failure modes in the prediction of residual strength in composite structures containing internal damage.
Book Synopsis RESTRAN: Residual Strength Analysis of Impact Damaged Composite Laminates by : Erik Saether
Download or read book RESTRAN: Residual Strength Analysis of Impact Damaged Composite Laminates written by Erik Saether and published by . This book was released on 2001-07-01 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of composite material systems in structural design has yielded significant improvements in material efficiency by minimizing weight while meeting static and dynamic strength requirements. The complexity of composite materials, however, has presented a spectrum of additional design considerations in the areas of fabrication, strength tailoring, failure mechanisms, and damage tolerance. Laminated composites exhibit a variety of damage and failure modes which include matrix cracking, fiber breakage, delamination propagation, and instability. Of prime concern is the predication of residual strength in composite structures subjected to damage-causing impact threats in the intended service environment. The present effort aims to account for many of the salient damage mechanisms utilizing a numerical, finite element- based approach. Such an approach permits a broad range of failure modes to be accounted for while allowing the modeling of complex geometries, support conditions, and applied loading. This report details the theoretical and algorithmic basis of a developed computer program denoted RESTRAN (REsidual STRength ANalysis), incorporating both material and structural failure modes in the prediction of residual strength in composite structures containing internal damage.
Book Synopsis Residual Strength and Life Prediction of Composite Laminates by :
Download or read book Residual Strength and Life Prediction of Composite Laminates written by and published by . This book was released on 1995 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: A systematic study was conducted to examine the influence of fiber-matrix interphase on the mechanical properties of composite laminates. Three material systems having the same carbon fibers and toughened epoxy matrix, but with different interphases were used in this study. The fibers used in the 810 A and 820 A systems received 100% and 200% surface treatments respectively, and were sized with epoxy material. The 8100 system was manufactured with 100% surface treated fiber that were sized with a thermoplastic material. Results indicate that the 810 0 system had significantly greater longitudinal tensile strength and failure Strain compared to the 810 A and 820 A systems. The 810 0 laminates have longer fatigue lives at higher load levels and shorter fatigue lives at lower load levels compared to the 810 A laminates. The 820 A laminates have longer life compared to the other two materials systems. The cross-ply laminates from the three material systems exhibit different damage mechanisms and failure modes under monotonic tensile and fatigue loading. A micromechanics model was developed to investigate the role of the interphase on the tensile strength of unidirectional laminates. A new parameter called the efficiency of the interface', is introduced in the model. A simple scheme that uses the experimentally determined tensile modulus of unidirectional laminates in a concentric cylinders model, is described to estimate the interfacial efficiency. The tensile fatigue performance of cross-ply laminates is predicted using this micromechanics model in a cumulative damage scheme. The predicted fatigue lives and failure modes agree well with experimental results. (MM).
Book Synopsis Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures by : D. E. Pettit
Download or read book Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures written by D. E. Pettit and published by . This book was released on 1979 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of the first task of a three task program directed at the study of relationship between damage propagation and residual static strength of composite laminates. In Task 1: Preliminary screening, two laminates a 24-Ply 67% 0 deg. fiber and a 32-Ply quasi-isotropic laminate of T300/5208 graphite epoxy material were selected for study. Two damage types were studied, a low velocity impact condition (i.e., simulated tool drop) and a badly drilled hole. An initial study was conducted for each damage type to determine the detailed damage introduction parameters resulting in the selection of one set of impact and one set of poor drilling conditions. Baseline static tension and static compression tests were conducted on each of the four damage/laminate conditions. Stress vs life (S-N) fatigue data were then generated at range ratio R=-1 for each of the four conditions. The damage growth characteristics were monitored on each fatigue specimen using a modified Holscan ultrasonic unit. A subset of the damaged hole specimens was also evaluated in static compression and fatigue (R = -1) using TBE enhanced X-ray methods to monitor damage growth and to assess any detrimental effect of TBE on subsequent behavior of the damage. The results indicate significant reduction in initial static tension and compression strengths for the damaged hole condition in both laminates.
Book Synopsis Defects and Damage in Composite Materials and Structures by : Rikard Benton Heslehurst
Download or read book Defects and Damage in Composite Materials and Structures written by Rikard Benton Heslehurst and published by CRC Press. This book was released on 2014-04-21 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advantages of composite materials include a high specific strength and stiffness, formability, and a comparative resistance to fatigue cracking and corrosion. However, not forsaking these advantages, composite materials are prone to a wide range of defects and damage that can significantly reduce the residual strength and stiffness of a structure or result in unfavorable load paths. Emphasizing defect identification and restitution, Defects and Damage in Composite Materials and Structures explains how defects and damage in composite materials and structures impact composite component performance. Providing ready access to an extensive, descriptive list of defects and damage types, this must-have reference: Examines defect criticality in composite structures Recommends repair actions to restore structural integrity Discusses failure modes and mechanisms of composites due to defects Reviews NDI processes for finding and identifying defects in composite materials Relating defect detection methods to defect type, the author merges his experience in the field of in-service activities for composite airframe maintenance and repair with indispensable reports and articles on defects and damage in advanced composite materials from the last 50 years.
Book Synopsis Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures by : K. N. Lauraitis
Download or read book Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures written by K. N. Lauraitis and published by . This book was released on 1981 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of the first task of the last two tasks of a three-task program focusing on the study of relationship between damage propagation and residual strength of graphite/epoxy laminates. Specimens of two laminate types, a 32-ply quasi-isotropic and 24-ply 67%-0, containing a centered poorly drilled hole were evaluated in this study. Baseline static tension and compression tests were conducted at high and low strain rates and at elevated temperature.
Book Synopsis Life Prediction Methodology for Composite Laminates. Part 1. Constant Amplitude and Two-Stress Level Fatigue by :
Download or read book Life Prediction Methodology for Composite Laminates. Part 1. Constant Amplitude and Two-Stress Level Fatigue written by and published by . This book was released on 1994 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: A strength-based wearout model is presented for predicting the residual strength and life of composite laminates subjected to constant amplitude or two-stress level fatigue loadings. It is assumed that the laminate undergoes proportional loading, that its residual strength is a monotonically decreasing function of the number of loading cycles, and that the probability of failure after an arbitrary number of cycles may be represented by a two parameter Weibull function. The model also incorporates a "cycle mix factor" to account for the degradation of strength and life that may be associated with frequent changes in the stress amplitude of the loading. Experimental results from two-stress level loadings are used to evaluate the model's predictive capability for sequencing effects, as in a low-high or high-low test, and for cycle mix effects, as in a low-high-low-high repeating test. Good correlation between theory and experiment is obtained for all loadings and laminates studied.
Author :Douglas J. K. Mewhort Publisher :Springer Science & Business Media ISBN 13 :3642126588 Total Pages :429 pages Book Rating :4.6/5 (421 download)
Book Synopsis High Performance Computing Systems and Applications by : Douglas J. K. Mewhort
Download or read book High Performance Computing Systems and Applications written by Douglas J. K. Mewhort and published by Springer Science & Business Media. This book was released on 2010-04-23 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the thoroughly refereed post-conference proceedings of the 23rd International Symposium on High Performance Computing Systems and Applications, HPCS 2009, held in Kingston, Canada, in June 2009. The 29 revised full papers presented - fully revised to incorporate reviewers' comments and discussions at the symposium - were carefully selected for inclusion in the book. The papers are organized in topical sections on turbulence, materials and life sciences, bringing HPC to industry, computing science, mathematics, and statistics, as well as HPC systems and methods.
Book Synopsis ICCS19 19th International Conference on Composite Structures by : Antonio J.M. Ferreira
Download or read book ICCS19 19th International Conference on Composite Structures written by Antonio J.M. Ferreira and published by Società Editrice Esculapio. This book was released on 2016-08-01 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, it is quite easy to see various applications of fibrous composites, functionally graded materials, laminated composite, nano-structured reinforcement, morphing composites, in many engineering fields, such as aerospace, mechanical, naval and civil engineering. The increase in the use of composite structures in different engineering practices justify the present international meeting where researches from every part of the globe can share and discuss the recent advancements regarding the use of standard structural components within advanced applications such as buckling, vibrations, repair, reinforcements, concrete, composite laminated materials and more recent metamaterials. For this reason, the establishment of this 19th edition of International Conference on Composite Structures has appeared appropriate to continue what has been begun during the previous editions. ICCS wants to be an occasion for many researchers from each part of the globe to meet and discuss about the recent advancements regarding the use of composite structures, sandwich panels, nanotechnology, bio-composites, delamination and fracture, experimental methods, manufacturing and other countless topics that have filled many sessions during this conference. As a proof of this event, which has taken place in Porto (Portugal), selected plenary and keynote lectures have been collected in the present book.
Book Synopsis Mechanical and Physical Testing of Biocomposites, Fibre-Reinforced Composites and Hybrid Composites by : Mohammad Jawaid
Download or read book Mechanical and Physical Testing of Biocomposites, Fibre-Reinforced Composites and Hybrid Composites written by Mohammad Jawaid and published by Woodhead Publishing. This book was released on 2018-09-14 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical and Physical Testing of Biocomposites, Fibre-Reinforced Composites and Hybrid Composites covers key aspects of fracture and failure in natural/synthetic fiber reinforced polymer based composite materials, ranging from crack propagation, to crack growth, and from notch-size effect, to damage-tolerant design. Topics of interest include mechanical properties, such as tensile, flexural, compression, shear, impact, fracture toughness, low and high velocity impact, and anti-ballistic properties of natural fiber, synthetic fibers and hybrid composites materials. It also covers physical properties, such as density, water absorption, thickness swelling, and void content of composite materials fabricated from natural or synthetic materials. Written by leading experts in the field, and covering composite materials developed from different natural fibers and their hybridization with synthetic fibers, the book's chapters provide cutting-edge, up-to-date research on the characterization, analysis and modelling of composite materials. Contains contributions from leading experts in the field Discusses recent progress on failure analysis, SHM, durability, life prediction and the modelling of damage in natural fiber-based composite materials Covers experimental, analytical and numerical analysis Provides detailed and comprehensive information on mechanical properties, testing methods and modelling techniques
Author :Committee on Assessment of Research Needs for Wind Turbine Rotor Materials Technology Publisher :National Academies Press ISBN 13 :0309583187 Total Pages :119 pages Book Rating :4.3/5 (95 download)
Book Synopsis Assessment of Research Needs for Wind Turbine Rotor Materials Technology by : Committee on Assessment of Research Needs for Wind Turbine Rotor Materials Technology
Download or read book Assessment of Research Needs for Wind Turbine Rotor Materials Technology written by Committee on Assessment of Research Needs for Wind Turbine Rotor Materials Technology and published by National Academies Press. This book was released on 1991-01-15 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind-driven power systems represent a renewable energy technology. Arrays of interconnected wind turbines can convert power carried by the wind into electricity. This book defines a research and development agenda for the U.S. Department of Energy's wind energy program in hopes of improving the performance of this emerging technology.
Book Synopsis Effects of Large Damage on Residual Strength of Carbon Fiber Reinforced Composite Laminates by : Muhammad Munir Zanial
Download or read book Effects of Large Damage on Residual Strength of Carbon Fiber Reinforced Composite Laminates written by Muhammad Munir Zanial and published by . This book was released on 2014 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tension or compression fracture behavior studies are normally initiated with open hole tension or compression tests performed at the laminate level. While these test data serve as an excellent starting point in residual strength studies in small notch sizes, the need to evaluate and verify the residual strength for larger structures and at larger notch sizes region is still there. An experimental study was performed with the focus on large notch sizes of circular hole and narrow slit flaw configurations on laminates fabricated with a carbon/epoxy oven-cure capable prepreg material system. The current part of the study focused on uniaxial tension loading with a constant width and height to flaw dimension ratio. Experimental test data were then combined with lamina and laminate level data for residual strength curves generation and the curves were validated against Whitney-Nuismer and Mar-Lin fracture mechanics models. The effects of flaw sizes and the flaw type towards the residual strength capability of a laminate turn out to be substantial as the notch size gets larger than one inch. Test results showed that a narrow slit or saw cut damage is far more critical than a circular hole cut-out. The notch sensitivity order of a saw cut flaw is also roughly three times more than that of a circular hole. Analytical studies were also performed to evaluate several finite element method variable effects on residual strength prediction and to discover the best practice in stress analyses of notched composite laminates. Point Stress failure criterion was used in the analyses and predicted failure loads were compared to the experimental data. Good agreements and correlations were found between the analytical predictions and the experimental data. It can be concluded that the residual strength of a notched laminated composite can be reasonably predicted from finite element analyses.
Book Synopsis State of the Art and Future Trends in Material Modeling by : Holm Altenbach
Download or read book State of the Art and Future Trends in Material Modeling written by Holm Altenbach and published by Springer Nature. This book was released on 2019-10-23 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: This special anniversary book celebrates the success of this Springer book series highlighting materials modeling as the key to developing new engineering products and applications. In this 100th volume of “Advanced Structured Materials”, international experts showcase the current state of the art and future trends in materials modeling, which is essential in order to fulfill the demanding requirements of next-generation engineering tasks.
Book Synopsis Numerical Modelling of Failure in Advanced Composite Materials by : Pedro P. Camanho
Download or read book Numerical Modelling of Failure in Advanced Composite Materials written by Pedro P. Camanho and published by Woodhead Publishing. This book was released on 2015-08-07 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical Modelling of Failure in Advanced Composite Materials comprehensively examines the most recent analysis techniques for advanced composite materials. Advanced composite materials are becoming increasingly important for lightweight design in aerospace, wind energy, and mechanical and civil engineering. Essential for exploiting their potential is the ability to reliably predict their mechanical behaviour, particularly the onset and propagation of failure. Part One investigates numerical modeling approaches to interlaminar failure in advanced composite materials. Part Two considers numerical modelling approaches to intralaminar failure. Part Three presents new and emerging advanced numerical algorithms for modeling and simulation of failure. Part Four closes by examining the various engineering and scientific applications of numerical modeling for analysis of failure in advanced composite materials, such as prediction of impact damage, failure in textile composites, and fracture behavior in through-thickness reinforced laminates. Examines the most recent analysis models for advanced composite materials in a coherent and comprehensive manner Investigates numerical modelling approaches to interlaminar failure and intralaminar failure in advanced composite materials Reviews advanced numerical algorithms for modeling and simulation of failure Examines various engineering and scientific applications of numerical modelling for analysis of failure in advanced composite materials