[PDF] Mode Ii Fatigue Fracture Of Wood Composite Bonded Interfaces eBook

Author : Anastasios P. Vassilopoulos
Publisher : Elsevier
Page : 553 pages
File Size : 46,64 MB
Release : 2014-10-21
Category : Technology & Engineering
ISBN : 0857098128

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It is commonly accepted that the majority of engineering failures happen due to fatigue or fracture phenomena. Adhesive bonding is a prevailing joining technique, widely used for critical connections in composite structures. However, the lack of knowledge regarding fatigue and fracture behaviour, and the shortage of tools for credible fatigue design, hinders the potential benefits of adhesively bonded joints. The demand for reliable and safe structures necessitates deep knowledge in this area in order to avoid catastrophic structural failures. This book reviews recent research in the field of fatigue and fracture of adhesively-bonded composite joints. The first part of the book discusses the experimental investigation of the reliability of adhesively-bonded composite joints, current research on understanding damage mechanisms, fatigue and fracture, durability and ageing as well as implications for design. The second part of the book covers the modelling of bond performance and failure mechanisms in different loading conditions. A detailed reference work for researchers in aerospace and engineering Expert coverage of different adhesively bonded composite joint structures An overview of joint failure

Author : Cole S. Hamey
Publisher :
Page : 110 pages
File Size : 49,80 MB
Release : 2007
Category : Civil engineering
ISBN :

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In this study, mechanics models for bi-layer beams suitable for bi-material interface characterization are introduced, and their application to mixed mode fracture of wood-FRP bonded interface is studied. First, an engineering approach for evaluating the mixed-mode (Mode-I/II) fracture toughness of wood/FRP composite bonded interfaces is presented. Two four-point bending specimens, i.e., four-point asymmetric end-notched flexure (4-AENF) and fourpoint asymmetric mixed-mode bending (4-AMMB), are proposed for the study of the mixed-mode fracture. With proper design, the rate of compliance change with respect to crack length can be determined to be independent of the crack length for the specimens. The proposed specimens can be used to determine the mixed-mode fracture toughness without the need of measuring the crack propagation length. Mode decompositions are evaluated for each specimen, and with previously determined Mode-I and Mode-II data, a number of failure criteria and failure envelopes are determined for the wood-FRP interface. Second, an intuitive mechanics-based approach is presented to analyze layered beams using the split beam model, from which the layered beam is modeled as individual subbeams and the stress acting throughout each sub-beam is used to determine the forces acting on the sub-beams. The split beam model is adapted to evaluate the compliance and ERR of three common groups of fracture specimens and loading conditions: Mode-I dominant (ADCB and DCB), Mode-II dominant (AENF and ENF), and Mixed-Mode (ASLB and SLB). It is demonstrated that the split beam model generates solutions consistent with those of existing specimens found in literature. Also, derived specimens are provided to allow for different ways of viewing the specimen configurations and possible ways of applying loads to achieve certain conditions. The compliance and ERR of two derived specimens are presented. The ERR for these two specimens is shown to be the same as the existing solutions, thus validating the accuracy of the approach. The simplified bi-layer models and related application to fracture of bi-material interface introduced in this study improve the data reduction techniques in fracture characterization and facilitate analysis and design of bi-material fracture specimens.

Author : W. P. De Wilde
Publisher : WIT Press
Page : 577 pages
File Size : 20,30 MB
Release : 2008
Category : Technology & Engineering
ISBN : 184564106X

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Including the latest developments in design, optimisation, manufacturing and experimentation, this text presents a wide range of topics relating to advanced types of structures, particularly those based on new concepts and new types of materials.

Author : BS. Trimble
Publisher :
Page : 19 pages
File Size : 38,2 MB
Release : 2000
Category : Bonded interface
ISBN :

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Current research on wood reinforcement has focused on the use of fiber-reinforced plastic (FRP) strips or fabrics bonded to wood members. Although significant increases in stiffness and strength have been achieved by this reinforcing technique, there is a concern about the reliable performance of the wood-FRP interface bond, which can be susceptible to delamination. The objective of this study is to present a combined analytical/experimental study to evaluate the effect of moisture on fracture toughness of composite/wood bonded interfaces under Mode I loading. A contoured double cantilever beam (CDCB) specimen is used to characterize the fracture toughness of both wood-wood and wood-FRP samples. The specimens are designed by the Rayleigh Ritz method to achieve a linear rate of compliance with respect to crack length and are calibrated experimentally and also analytically by the finite element method. Both wood-wood and wood-FRP samples are tested under dry and wet conditions, and bonded interface fracture toughness data under Mode I loading are obtained. The guidelines and procedures for the modeling and design of CDCB specimens for hybrid or dissimilar adherends using a Rayleigh-Ritz model are presented briefly, and a modified Rayleigh-Ritz method is further developed. The effect of moisture on fracture toughness is evaluated, and increases in interface fracture toughness are observed due to moisture absorption for wet wood-wood and wood-FRP samples; the toughening of the interface under moisture is due mainly to a much more plastic fracture failure mode of the interface.

Author : Golam M. Newaz
Publisher : CRC Press
Page : 1068 pages
File Size : 41,44 MB
Release : 2019-11-28
Category : Technology & Engineering
ISBN : 1000725502

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First published in 1998. A collection of papers presented at the Proceedings of the Eighth Japan-U.S. Conference On Composite Materials, SEPTEMBER 24 to 25 , 1998. The conference is organized by Wayne State University and American Society for Composites in cooperation with U.S. Organizing Committee and the Japanese Organizing Committee. Since the Seventh Meeting in Kyoto in 1995, this meeting brings together accomplished composite researchers between the two countries to share latest developments and advances in the field. The scope of the current conference ranges over all aspects of composite materials with some emphasis on infrastructure applications of composites. Key areas in composites are covered by 110 papers with 35 presentations from Japan.