» » Multi-Level Technique for Stiffness and Strength Calculations of Woven Fabric Composite Plate and Shell Structures

Multi-Level Technique for Stiffness and Strength Calculations of Woven Fabric Composite Plate and Shell Structures epub

by Ahmet Altekin


Multi-Level Technique for Stiffness and Strength Calculations of Woven Fabric Composite Plate and Shell Structures epub

ISBN: 1423550544

ISBN13: 978-1423550549

Author: Ahmet Altekin

Category: No category

Language: English

Publisher: Storming Media (2001)

ePUB book: 1132 kb

FB2 book: 1515 kb

Rating: 4.6

Votes: 513

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Nonlinear behavior of laminated composite plates and shells is studied

Nonlinear behavior of laminated composite plates and shells is studied. In the analysis, material nonlinearity due to the matrix degradation at the initial failure is considered along with the geometrical nonlinearity in the deformation process. The approach can predict the stiffness, strength and progressive failure of woven-fabric composite structures using material properties of the fiber and matrix materials, their volume fractions, and the information for weaving and lamination. Progressive failure can be described at the fundamental level like fiber failure, matrix failure and interface failure.

1 NAVAL POSTGRADUATE SCHOOL Monterey, California THESIS MULTI-LEVEL TECHNIQUE FOR STIFFNESS AND STRENGTH CALCULATIONS OF WOVEN FABRIC COMPOSITE PLATE AND SHELL STRUCTURES by Ahmet Altekin June 2001 Thesis Advisor.

1 NAVAL POSTGRADUATE SCHOOL Monterey, California THESIS MULTI-LEVEL TECHNIQUE FOR STIFFNESS AND STRENGTH CALCULATIONS OF WOVEN FABRIC COMPOSITE PLATE AND SHELL STRUCTURES by Ahmet Altekin June 2001 Thesis Advisor: Young W. Kwon Approved for public release; distribution is unlimited.

Y. W. Kwon and A. Altekin, Multi-level, for analysis of woven fabric composite plates, J. Compos. 36, No. 8, 1005–1022 (2002).

Ishikawa and T. Chou, Stiffness and strength behavior of woven fabric composite, J. of Material Sc. 17, 3211–20 (1982). 43. N. K. Naik and P. S. Shembekar, Elastic behavior of woven fabric composites: I-Lamina analysis, J. of Composite Materials. 26, No. 15, 2197–2225 (1992). 44. P. Shembekar and N. Naik, Elastic behavior of woven fabric composites: II-Laminate analysis, J. of Composite Materials, 26, No. 15, 2226–2246 (1992). Y.

Structural components, plates, shells, sandwich panels, sandwich shells, beams and struts, are manufactured from CFRP materials to provide a design with high strength to weight and stiffness to weight ratios. This is achieved by using the minimum number of plies of unidirectional material or woven fabric orientated at various angles to provide a laminate that satisfies the stiffness, strength, thermal distortion and functional requirements. The thickness, orientation and lay up of the plies can produce laminates that exhibit coupling in membrane and bending behaviour. Such characteristics can.

This e-book focuses on the vibrational and nonlinear aspects of plate and shell structure dynamics by applying the .

This e-book focuses on the vibrational and nonlinear aspects of plate and shell structure dynamics by applying the finite element model. In addition to presenting the steps in the derivations of the consistent element stiffness and mass matrices, constitutive relations of elastic materials and elasto-plastic materials with isotropic strain hardening, yield criterion, return mapping, configuration and stress updating strategies, and numerical algorithms are presented and discussed.

Apart from their stiffness and strength, these . The composite materials are generally divided into two classes . laminates and sandwiches. Disadvantages Sometimes un-wetted fractions of fiber fabric ruined the whole mass and it is very expansive to discard the scrap.

Apart from their stiffness and strength, these cannot be solely used in the manufacturing of wind turbine blades. However they are combined in composite materials. 6 The fibers are divided into different sub classes . glass fiber, carbon fiber, aramid, polyethylene and cellulose. In the following text, we will focus more on glass fiber and carbon fiber. It works very fine with smaller components.

The article is devoted to the evaluation of the torsional stiffness of the beam-pillar nodal connection of thin-walled rack structures. Buckling modes of out of the face plate and in the face plate are considered. Results of in-place testing of several girder rack models are described, beam model and combined one are considered. Computational finite element (FE) models of these racks are designed to develop a FE analysis by software complex ANSYS. The influence of the torsional stiffness of the beam-pillar nodal connection on bearing capacity and buckling stability of thin-walled rack structure is investigated.

Keywords: Composite materials, textile structural composites, woven and . Yarn structure plays a dominant role in the translation of fiber properties into yarn properties.

Keywords: Composite materials, textile structural composites, woven and braided fabrics, homogenization, effective moduli, constitutive models, progressive failure. Numerical constitutive models of woven and braided textile structural composites. At the present time, the UMAT has only been tested as a stand-alone program with Visual Fortran ., and would require further development to be used within ABAQUS on sample structural problems.

This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A589593. The abstract provided by the Pentagon follows: The stiffness and strength behavior of the woven fabric composite materials mainly depend on the properties of the fiber and matrix materials. A technique was developed to design and analyze woven fabric composites based on the micro-level properties of the fiber and matrix materials. The technique is based on the bilateral relationships among the fiber/matrix materials, the unidirectional composite (strand), the woven fabric layer and the laminated composite structure as in the given order. Simplified and efficient analytical models were developed for the relationship between any subsequent levels of woven fabric composite materials. The technique is used to predict the structural level stiffness and strength in terms of material and the geometric configuration of the woven fabric and lamination. Progressive damage or failure can also be simulated at the fiber and matrix level by using this technique.