Download or read book Progressive Damage Modeling of Tensile Deformation of a Fiber Reinforced Composite Laminate Under Strain Rate Effects written by Shiguang Deng and published by . This book was released on 2012 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finite element modeling provides an efficient approach to simulate the mechanical behaviors of composite materials. Many finite element models were built to predict the mechanical responses of composite materials under the static loading conditions. Such static-loading models of composite materials were too modest to predict their behaviors under the dynamic loading process, say varying strain rates. In this thesis, we established both macromechanical and micromechanical finite element models to simulate the progressive damages of fiber reinforced composite materials under varying intermediate strain rates. With the application of the strain-rate-dependent composite properties, failure analysis and associated property degradations of failed composites, we were able to build a macromechanical finite element model to simulate the strain-rate-dependent mechanical behaviors of composite materials under intermediate strain rates. Through the comparison of our numerical results with experimental observations and modeling results reported in the literature, recommended values of mesh densities were presented and the correctness of our macromechanical mode was validated. The model was further developed with a multicontinuum theory (MCT). Based on the macromechanical model, a micromechanical model was developed to study the effects of a MCT-based constituent stress interactive failure criterion on the numerical results of a tensile test on a composite coupon with varying strain rates. The MCT is based on a constituent volume average procedure and was used to calculate the stress and strain states of every constituent within the composite. Based on the stress information of the constituents, associated failure criteria and degradation rules were presented for the model. By comparing the simulation results of the macromechanical and micromechanical models, we found some differences between them and further recommendations were given for modifying the present model to simulate the progressive damage dynamic responses of composite structures more precisely.
Download or read book In Situ Monitoring of Fiber Reinforced Composites written by Markus G.R. Sause and published by Springer. This book was released on 2016-06-14 with total page 647 pages. Available in PDF, EPUB and Kindle. Book excerpt: “...a comprehensive and well written book, which...will be useful reading for both researchers entering the field and experienced specialists looking for new ideas....a valuable and long-lasting contribution to experimental mechanics.” – Stepan Lomov, KU Leuven This expert volume, an enhanced Habilitation thesis by the head of the Materials Testing Research Group at the University of Augsburg, provides detailed coverage of a range of inspection methods for insitu characterization of fiber-reinforced composites. The failure behavior of fiber reinforced composites is a complex evolution of microscopic damage phenomena. Beyond the use of classical testing methods, the ability to monitor the progression of damage insitu offers new ways to interpret the materials failure modes. Methods covered include digital image correlation, acoustic emission, electromagnetic emission, computed tomography, thermography, shearography, and promising method combinations. For each method, the discussion includes operational principles and practical applications for quality control as well as thoughtful assessment of the method's strengths and weakness so that the reader is equipped to decide which method or methods are most appropriate in a given situation. The book includes extensive appendices covering common experimental parameters influencing comparability of acoustic emission measurements; materials properties for modeling; and an overview of terms and abbreviations.
Download or read book A Progrssive i e Progressive Damage Analysis Including Delamination for Fiber Reinforced Composites written by Sivom Manchiraju and published by . This book was released on 2004 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fiber Matrix and Interface Properties written by Christopher J. Spragg and published by ASTM International. This book was released on 1996 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Emphasizing fiber-matrix adhesion and its characterization in composite materials, reports results from applying the most commonly used test methods, such as fragmentation, pull-out, and indentation, to high-performance composites and their constituents. The 13 papers were presented at a symposium i
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1998 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1988 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Progressive Damage and Failure Model for Composite Laminates Under Multiaxial Loading Conditions written by Peter Amaya and published by . This book was released on 2012 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: A progressive damage and failure model is proposed for continuous fiber reinforced composite laminates under triaxial loading conditions. A literature review with emphasis on macromechanics based failure theories applied to composite laminates under static loading conditions shows that there is a need to validate failure models for composite laminates under triaxial loading conditions. Available experimental data show that the mechanical behavior and progressive damage of composite laminates may be different under multiaxial loading than under uniaxial loading conditions. The proposed failure model is an extension of the strain energy failure theory for triaxial loading conditions. The proposed strain energy model requires six parameters in order to predict the mechanical behavior and progressive damage of a composite laminate. Three material parameters are determined through laboratory tests involving unidirectional laminates subjected to multiaxial loading or multidirectional laminates subjected to uniaxial loading. The remaining three model parameters are used to represent unloading of failed lamina after initial failure has occurred. The proposed strain energy based failure theory and post initial-failure degradation model are combined with a stress field developed using either classical lamination theory or the finite element method using reduced integration quadratic hexahedral elements. The proposed failure model with classical lamination theory stress field gave adequate predictions compared with published experimental results for the initial failure, progressive damage, and final failure for tubular specimens under combined torsion and hydrostatic pressure as well as cylindrical dogbone specimens under combined uniaxial loading and hydrostatic pressure. The proposed failure model with the finite element stress field was able to adequately model stress concentrations near the free edges as well as predict initial, intermediate, and final failures for a cross-ply coupon under uniaxial extension as compared with experimental data. The validation of the proposed model suggests that it may be extended to predict the progressive damage and failure of composite laminate structures of complex geometries under complex loading conditions.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strain Rate Effects on Tensile Failure and Damage Tolerance of Composite Laminates written by Yew-Poh Mak and published by . This book was released on 1992 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study was carried out to investigate the behavior of graphite/epoxy laminates under uniaxial tensile loading at strain rates ranging from 0.0042 [epsilon]/min to 2 [epsilon]/min. The specimens were manufactured using two methods: automated tow placement and manual tape layup. The two material systems used were IM7/977-2 and AS4/938. The failure strengths, failure modes and laminate properties of both unnotched and notched specimens were measured. IM7/977-2 tape layup specimens were insensitive to strain rates between 0.005 [epsilon]/min and 0.5 [epsilon]/min, except for observed differences in the failure modes of the notched specimens. Although the undamaged response of the AS4/938 specimens was not dependent on manufacturing technique or strain rate, their damage tolerance was dependent on both factors. Notched tow placed specimens were stronger than notched tape layup specimens at all strain rates. The failure strengths of the notched tape layup specimens were significantly strain rate dependent, decreasing by about 20% at 2 [epsilon]/min; the notched tow placed specimens showed little strain rate sensitivity. The failure modes of the notched tow placed and notched tape layup specimens differed, but were independent of strain rates. The notched tow placed specimens exhibited a progressive failure, surviving to loads well beyond the load at which damage initiated at the notch tip. Conversely, the notched tape layup specimens at high strain rates exhibited a brittle failure; they failed soon after damage initiation.
Download or read book Engine Structures written by and published by . This book was released on 1988 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Creep and Fatigue in Polymer Matrix Composites written by Rui Miranda Guedes and published by Woodhead Publishing. This book was released on 2019-03-14 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Experimental Verification of a Progressive Damage Model for Composite Laminates Based on Continuum Damage Mechanics written by and published by . This book was released on 1994 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Modeling of Progressive Failure and Damage in Composite Laminates written by Shiladitya Basu and published by . This book was released on 2005 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fibre Metal Laminates written by Ad Vlot and published by Springer Science & Business Media. This book was released on 2001-09-30 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: Like New, No Highlights,No Markup,all pages are intact.
Download or read book Development of an Engineering Analysis of Progressive Damage in Composites During Low Velocity Impact written by E. A. Humphreys and published by . This book was released on 1981 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
