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Random Vibration And Fracture Of Tapered Composite Laminates
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Book Synopsis Random Vibration and Fracture of Tapered Composite Laminates by : Chen Hai
Download or read book Random Vibration and Fracture of Tapered Composite Laminates written by Chen Hai and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer-matrix tapered composite laminates with internal taper are considered in the present thesis. Appropriate finite element models for the tapered laminates are developed using quadratic isoparametric elements. Both the rectangular and triangular isoparametric elements are employed in the model in order to obtain accurate solutions. Singularity elements are used to model the vicinity of the crack tip in the laminate. Appropriate computational methods including the displacement extrapolation method and virtual crack extension method are employed for the determination of the following fracture parameters: stress intensity factor, energy release rate, and J-integral. In order to determine the response to random excitation, the normal mode method is employed in conjunction with the finite element method. The associated computer programs are developed using FORTRAN ® and MATLAB ® programming languages. The fracture behavior and the dynamic response to stationary random excitation of different types of internally tapered laminate are investigated based on the finite element model. The locations of delamination initiation are predicted based on the stress analysis results and the Von Mises failure criterion. The energy release rates and J-integral values corresponding to the delamination at the critical location of the laminate are computed. The effects of taper angle and the laminate configuration on the fracture behavior and the random vibration of the laminate are determined. The probability of failure is then calculated and the use of this information in determining the location of failure initiation is demonstrated.
Book Synopsis Interlaminar Stresses and Fracture Behavior in Thickness-tapered Composite Laminates by : Kan He
Download or read book Interlaminar Stresses and Fracture Behavior in Thickness-tapered Composite Laminates written by Kan He and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design and manufacture of a variable thickness composite laminate such as a helicopter yoke involves tapering the laminate by dropping individual plies at discrete internal locations, in order to tailor the stiffness of the laminate. The ply drop in the laminate creates large interlaminar stresses and initiates delamination. Therefore, there is a necessity to investigate the fundamental failure mechanisms and controlling parameters that account for the delamination mode of failure in tapered laminates. In this thesis, a numerical and experimental study on interlaminar stresses and delamination in tapered laminates is presented, including a critical and comprehensive review on earlier works on this type of structure. Numerical analyses performed involved development of partial hybrid stress finite elements needed to enhance computational efficiency, and development of a physical concept-based modified shear-lag model that is based on the essential assumptions that both plies and resin layers are treated as carriers of tensile stress and also to act as stress-transfer media. Experimental analysis was attempted to assess the accuracy of the numerical predictions. For this purpose, tapered NCT-301 Graphite/Epoxy specimens were manufactured using a ply in-fill technique for the cured consolidation and tested under quasi-static uniaxial tension. To perform strength and delamination analyses of the tapered laminate, the laminate was modeled as a generalized plane deformation problem, where all the variables involved in the model are independent of the coordinate system. Also quasi-three dimensional partial hybrid finite elements were used to quantify the analysis. In addition to the plies, the inter-ply resin at the critical ply interface was also modeled in order to have direct and realistic interlaminar responses. Stress-based criteria that have proved to be effective in determination of critical location and load of delamination onset were utilized in this study to predict the delamination strength of the laminate. A good correlation between the predictions and experimental results were observed. Evaluation of strain energy release rates of delaminations occurring at the critical interfaces of the tapered laminate was carried out by using the J -integral approach. This was possible because of the path-independence of the J -integral that results in avoiding the need for analyzing the singular stress field near the delamination tip and reducing the computing effort required. Effects of various design parameters on the structural performance of the tapered laminate were studied so as to gain an insight into design considerations for tapered composite structures.
Book Synopsis Vibration Testing of Impact-damaged Composite Laminates by : Joseph E. Grady
Download or read book Vibration Testing of Impact-damaged Composite Laminates written by Joseph E. Grady and published by . This book was released on 1989 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nonlinear Random Vibration of Composite Laminated Plates by : Mohamad Khaled Naja
Download or read book Nonlinear Random Vibration of Composite Laminated Plates written by Mohamad Khaled Naja and published by . This book was released on 1993 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prediction of Composite Laminate Fracture: Micromechanics and Progressive Fracture by : P. K. Gotsis
Download or read book Prediction of Composite Laminate Fracture: Micromechanics and Progressive Fracture written by P. K. Gotsis and published by . This book was released on 1996 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vibration Analysis of Thickness-Tapered Laminated Composite Square Plates Based on Ritz Method by : Babak Arab
Download or read book Vibration Analysis of Thickness-Tapered Laminated Composite Square Plates Based on Ritz Method written by Babak Arab and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The abstract of this item has been embargoed until 2021-09-01.
Book Synopsis Fatigue Delamination Onset Prediction in Tapered Composite Laminates by :
Download or read book Fatigue Delamination Onset Prediction in Tapered Composite Laminates written by and published by . This book was released on 1989 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vibration Testing of Impact-damaged Composite Laminates by : Joseph H. Grady
Download or read book Vibration Testing of Impact-damaged Composite Laminates written by Joseph H. Grady and published by . This book was released on 1989 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722392918 Total Pages :64 pages Book Rating :4.3/5 (929 download)
Book Synopsis Fatigue Delamination Onset Prediction in Tapered Composite Laminates by : National Aeronautics and Space Administration (NASA)
Download or read book Fatigue Delamination Onset Prediction in Tapered Composite Laminates written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tapered (0 deg) laminates of S2/CE9000 and S2/SP250 glass/epoxies, and IM6/1827I graphite/epoxy were tested in cyclic tension. The specimens usually showed some initial stable delaminations in the tapered region, but these did not affect the stiffness of the specimens, and loading was continued until the specimens either delaminated unstably, or reached 10(exp 6) to 2 x 10(exp 7) million cycles with no unstable delamination. The final unstable delamination originated at the junction of the thin and tapered regions. A finite-element model was developed for the tapered laminate with and without the initial stable delaminations observed in the tests. The analysis showed that for both cases the most likely place for an opening (Mode 1) delamination to originate is at the junction of the taper and thin regions. For each material type, the models were used to calculate the strain energy release rate, G, associated with delaminations originating at that junction and growing either into the thin region or tapered region. For the materials tested, cyclic G(sub Imax) values from DCB tests were used with the maximum strain energy release rates calculated from the finite-element analysis to predict the onset of unstable delamination at the junction as a function of fatigue cycles. The predictions were compared to experimental values of maximum cyclic load as a function of cycles to unstable delamination from fatigue tests in tapered laminates. For the IM6/1827I and S2/SP250 laminates, the predictions agreed very well with the test data. Predicted values for the S2/CE9000 were conservative compared to the test data. Murri, Gretchen Bostaph and Salpekar, Satish A. and Obrien, T. Kevin Langley Research Center...
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:
Book Synopsis Fracture and Damage of Composite Laminates by : Peter Gudmundson
Download or read book Fracture and Damage of Composite Laminates written by Peter Gudmundson and published by . This book was released on 1993 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies in Interlaminar Fracture of Composite Laminates by : Freddy Weinstein
Download or read book Studies in Interlaminar Fracture of Composite Laminates written by Freddy Weinstein and published by . This book was released on 1986 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tensile Fracture of Composite Laminates with Holes and Cracks by : Carl-Gustaff Aronsson
Download or read book Tensile Fracture of Composite Laminates with Holes and Cracks written by Carl-Gustaff Aronsson and published by . This book was released on 1984 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic Instability Analysis of Tapered Composite Plates Using Ritz and Finite Element Methods by : Weiguang Liu
Download or read book Dynamic Instability Analysis of Tapered Composite Plates Using Ritz and Finite Element Methods written by Weiguang Liu and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tapered composite plates are widely used in civil, mechanical and aerospace structures such as robot arms, wing structures, helicopter yoke and turbine blade where the plate structure needs to be stiff at one location and flexible at another location. By terminating some plies at discrete locations, different types of ply drop-off can be obtained depending on the application. In the present work, the instability of tapered laminates under dynamic loading conditions is considered. Because of the complicated mechanical behavior of the tapered composite plate and the complexity of the analysis, no exact solution is available at present and therefore, Ritz method and finite element method have been used for the calculation of the dynamic instability regions. Solutions based on classical laminated plate theory have been developed first for vibration and buckling of uniform and tapered composite plates without in-plane forces. The effects on the laminate stiffness of the composite plates caused by the taper angle have been considered. Different configurations of tapered plates have been investigated. Then, based on the formulations for free vibration and buckling, the formulation for the dynamic instability analysis has been developed using Finite Element Method and Ritz method for both uniform-thickness and tapered composite plates based on classical laminated plate theory. The efficiency and accuracy of the developed formulation are established in comparison with available solutions for uniform-thickness laminates. The dynamic instability regions that serve as a measure of the degree of instability of the laminates are determined considering different boundary conditions, the tapered composite plate configurations, and the in-plane loading patterns. The NCT301 graphite-epoxy composite material is considered in the numerical study.
Book Synopsis A Study of Fracture Phenomena in Fiber Composite Laminates by : Harold John Konish
Download or read book A Study of Fracture Phenomena in Fiber Composite Laminates written by Harold John Konish and published by . This book was released on 1973 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
