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Effect Of Notch Size On The Reliability Of Composite Laminates Based On Stochastic Finite Element Analysis And Experimental Investigation
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Book Synopsis Effect of Notch Size on the Reliability of Composite Laminates Based on Stochastic Finite Element Analysis and Experimental Investigation by : Md Ibrahim
Download or read book Effect of Notch Size on the Reliability of Composite Laminates Based on Stochastic Finite Element Analysis and Experimental Investigation written by Md Ibrahim and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work considers the reliability of notched composite laminates based on stochastic mechanics. The reliability of composite laminates with different notch sizes is evaluated using point stress criterion and average stress criterion. Reliability values are calculated based on the stresses developed over certain characteristic distances from the notch edge and the strength of the corresponding un-notched laminates. In practical applications, it is very difficult to achieve a perfect circular profile during the drilling operation on a composite laminate and also there is a possibility that the driven hole is offset from the desired location. These imperfections affect the reliability of the laminate. In the present work the perturbation in the circular profile of the hole is modeled using a hypotrochoid variation and further, the location of the hole center is modeled using a Gaussian random variable. Tests are conducted on specimens made of graphite/epoxy material to determine the material properties that are required for stochastic analysisn.
Book Synopsis Reliability of Center-notched and Edge-notched Composite Laminates Based on Experimental Investigation and Stochastic Finite Element Analysis by : Anandha Kumar Arumugam
Download or read book Reliability of Center-notched and Edge-notched Composite Laminates Based on Experimental Investigation and Stochastic Finite Element Analysis written by Anandha Kumar Arumugam and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stochastic Mechanics and Reliability of Composite Laminates Based on Experimental Investigation and Stochastic FEM by : Shashank M. Venugopal
Download or read book Stochastic Mechanics and Reliability of Composite Laminates Based on Experimental Investigation and Stochastic FEM written by Shashank M. Venugopal and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work concerns the stochastic mechanics and reliability of composite laminates. The reliability of notched composite laminates is evaluated based on the average stress over a certain characteristic distance from the notch edge and the strength of the corresponding un-notched laminate. In the present work the perturbation in the radius of the hole is modeled using a hypotrochoid variation and further, the location of the hole centre is modeled using a Gaussian random variable. In order to achieve a design with a required reliability and safety, (i) the stress analysis of the notched laminate has to be conducted based on a stochastic approach, (ii) the strength distribution and its probabilistic parameters have to be determined based on a number of tests, and (iii) the reliability analysis has to be conducted. Two-dimensional stochastic finite element analyses of notched symmetric cross-ply [0/90] 4 s and angle-ply [02/±45] 2 s composite laminates are conducted. A comprehensive experimental investigation is carried out to determine the strength values of the laminates subjected to tensile load. Average stress criterion is used to predict the characteristic length values of the laminates. The distributions of the strength and characteristic length of laminates with symmetric cross-ply [0/90] 4 s configuration are determined by testing 25 samples of notched and 25 samples of un-notched laminates. In a similar manner, tests on angle-ply laminate [02/±45] 2 s are conducted. Stochastic simulation is performed on the laminates by subjecting them to uniaxial, biaxial, shear and bending loads. Probabilistic moments of the stress parameters that are of interest are found out for the so-called controlled hole and uncontrolled hole laminates. The reliability indices for the two laminate configurations are calculated by combining the stochastic finite element analysis and the test results.
Book Synopsis Stochastic J-integral and Realiability of Composite Laminates Based on a Computational Methodology Combining Experimental Investigation, Stochastic Finite Element Analysis and Maximum Entropy Method by : Lakshmi Vara Prasad Pondugala
Download or read book Stochastic J-integral and Realiability of Composite Laminates Based on a Computational Methodology Combining Experimental Investigation, Stochastic Finite Element Analysis and Maximum Entropy Method written by Lakshmi Vara Prasad Pondugala and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stochastic J-integral and Reliability of Composite Laminates Based on a Computational Methodology Combining Experimental Investigation, Stochastic Finite Element Analysis and Maximum Entropy Method by :
Download or read book Stochastic J-integral and Reliability of Composite Laminates Based on a Computational Methodology Combining Experimental Investigation, Stochastic Finite Element Analysis and Maximum Entropy Method written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue of Composite Materials by : Ronald F. Gibson
Download or read book Fatigue of Composite Materials written by Ronald F. Gibson and published by DEStech Publications, Inc. This book was released on 2013 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents investigations into fatigue in composite materials and structures. Sections include: research into aspects of fatigue modeling including prediction of fatigue life, fatigue strength and fatigue crack growth rate; experimental characterization of fatigue in composites, and discussing fatigue behavior of fullscale composite structures.
Download or read book Master's Theses Directories written by and published by . This book was released on 2005 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Book Synopsis A Combined Experimental and Stochastic Finite Element Analysis Methodology for the Probabilistic Fracture Behavior of Composite Laminates by : Md. Zakiul Haque
Download or read book A Combined Experimental and Stochastic Finite Element Analysis Methodology for the Probabilistic Fracture Behavior of Composite Laminates written by Md. Zakiul Haque and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the thesis, a combined experimental and stochastic finite element analysis methodology that can incorporate the material property variabilities and based on these, predict the stochastic characteristics of the Stress Intensity Factor (SIF) and the Strain Energy Release Rate (G) of composite laminates, is developed. Using this methodology, the probabilistic fracture analysis of laminated composites is performed. The material and geometric properties of the laminate are described in terms of homogeneous two-dimensional spatial stochastic fields and random variables that are established based on material property tests. In the finite element formulation, the elasticity matrix for the laminate is obtained based on the laminate theory. This matrix, in contrast to the deterministic finite element analysis, will be a stochastic matrix that has different values at different Gauss point locations within the same element. The fracture behavior of the laminate is quantified through the two parameters, Stress Intensity Factor (SIF) and Energy Release Rate (ERR). A formulation for determining the reliability of composite laminates based on the probabilistic characteristics of stress intensity factor and that of the fracture toughness, is described. Different types of orthotropic laminates are analyzed.
Book Synopsis Stochastic Finite Element Fracture Analysis and Reliability of Composite Laminates Based on Exact Field Modeling Method by : Wei Tang
Download or read book Stochastic Finite Element Fracture Analysis and Reliability of Composite Laminates Based on Exact Field Modeling Method written by Wei Tang and published by . This book was released on 2001 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 An Analytical and Experimental Study of Mechanisms Critical to the Failure of Notched Graphite/epoxy Laminates by : Richard André Kroes
Download or read book An Analytical and Experimental Study of Mechanisms Critical to the Failure of Notched Graphite/epoxy Laminates written by Richard André Kroes and published by . This book was released on 1994 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental results and a numerical study were used to investigate the mechanisms critical to the failure of notched graphite/epoxy laminates. Experimental results from the Boeing/NASA ATCAS program were reviewed and reduced to give insight into the growth of damage from the tips of notches in tensile specimens. A finite element model was constructed to model the specimens, and a damaged based modeling approach used to investigate the effects of this damage. Properties of the elements in a region at the notch tips were altered to simulate damage. Matrix failure and fiber failure were modeled by reducing the material properties in these elements. Delaminations were modeled using a 2-D stacked membrane approach. The damage types were impregnated into the finite element model individually and in various combinations, and the changes in the stress and strain distributions in the model examined. Most calculations were linear. A geometrically non-linear model was used to examine buckling observed above and below the notch in large specimens. The experimental results confirmed the importance of the role of progressive damage growing from the notch tip in the failure of the laminate. Such damage can actually increase the strength of the laminate by relieving the stress concentration at the notch tip. The numerical results showed that modeled matrix failure and delaminations had very small effects individually, but significant effects when combined. Fiber failure had a large effect. Only models incorporating severe damage, including delaminations, matrix cracking, and substantial fiber failure, could correlate to the large changes in strain distribution observed to accompany damage in the test specimens. The non-linear analyses replicated the observed buckling above and below the notch. It was found to have a major effect on the stresses near the notch tip. This study shows that it is possible to model the effects of damage on the stress field in a notched composite laminate; that such models are sensitive to modeling details such as interactions of damage types; that the damage observed during tests is severe; and that buckling near the notch tip can have profound effects.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1987 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Observations and Finite Element Analysis of the Initiation of Fiber Microbuckling in Notched Composite Laminates by : Eunice Gail Guynn
Download or read book Experimental Observations and Finite Element Analysis of the Initiation of Fiber Microbuckling in Notched Composite Laminates written by Eunice Gail Guynn and published by . This book was released on 1990 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Uncertainty Quantification in Laminated Composites by : Sudip Dey
Download or read book Uncertainty Quantification in Laminated Composites written by Sudip Dey and published by CRC Press. This book was released on 2018-09-19 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last few decades, uncertainty quantification in composite materials and structures has gained a lot of attention from the research community as a result of industrial requirements. This book presents computationally efficient uncertainty quantification schemes following meta-model-based approaches for stochasticity in material and geometric parameters of laminated composite structures. Several metamodels have been studied and comparative results have been presented for different static and dynamic responses. Results for sensitivity analyses are provided for a comprehensive coverage of the relative importance of different material and geometric parameters in the global structural responses.
Book Synopsis Experimental Investigation, Stochastic Modelling and Reliability Analysis of Fatigue Behavior of Tapered Composite Laminates by : Xuan Ning Guo
Download or read book Experimental Investigation, Stochastic Modelling and Reliability Analysis of Fatigue Behavior of Tapered Composite Laminates written by Xuan Ning Guo and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analytical and Experimental Investigation of the Notched Strength of Thick Laminates with Surface Notches by : CE. Harris
Download or read book Analytical and Experimental Investigation of the Notched Strength of Thick Laminates with Surface Notches written by CE. Harris and published by . This book was released on 1988 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental and analytical investigations of the fracture of a [0/± 45/90]10s graphite/epoxy laminate with part-through semi-elliptic surface notches have been conducted. Experimental values of notched strength were determined for a variety of notch aspect ratios and notch depths. Analytical predictions of laminate failure were obtained from three different models. One model was based on fracture mechanics concepts while the other two models were based on strength-of-materials concepts with a linear and quadratic strain distribution through the laminate thickness at the notch. The kinematic strain assumptions were in part based on results of a moiré interferometry investigation of the strain field at the notch.
Book Synopsis Analysis of Interlaminar Stresses in Thick Composite Laminates with and Without Edge Delamination by :
Download or read book Analysis of Interlaminar Stresses in Thick Composite Laminates with and Without Edge Delamination written by and published by . This book was released on 1984 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
