Equivalent crack based mode II fracture characterization of wood

Moura, M.F.S.F. de; Silva, M.A.L.; Morais, A.B. de; Morais, J.J.L.

doi:10.1016/j.engfracmech.2006.01.004

Cited by 130 publications

(66 citation statements)

References 16 publications

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“…In spite of mode-I and mode-III, crack front distribution in mode-II was uniform with the exception of localized peaks at the specimen edge [36,37] and crack advance was linear and no difference was detected between crack length at the edges and in the center of the specimen. This point demonstrated that, in mode-III as mode-I loading, there was a higher potential for the growth of crack in the center width of adhesive pad, which indicated that a crack can grow in mode-I and mode-III without being noticed.…”

Section: Resultsmentioning

confidence: 99%

The use of ECT and 6PBP tests to evaluate fracture behavior of adhesively bonded steel/epoxy joints under Mode-III and Mixed Mode III/II

Mehrabadi

2014

appl adhes sci

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Evaluation of fracture energy of adhesive joints under mode-III and mixed-mode III/II is a key issue when failure analyses have to be performed. It is thus useful to determine fracture toughness under mode-III and characterization of crack front behavior of bonded joints under mixed-mode III/II loading conditions, which were the overall goal of this paper. For this purpose, edge crack torsion (ECT) and six-point bending plate (6PBP) tests were employed using steel/epoxy adhesive joint. The experimental tests were performed under displacement control and three types of configurations were tested to achieve different mixed-mode ratios. Test results showed considerable linearity before the maximum load point both under pure mode III and mixed-mode III/II; also, failure examination indicated that dominate failure under tearing mode was adhesive/adherend interface, which will be discussed in detail. The experimental tests were numerically simulated and virtual crack closure technique (VCCT) was employed to reproduce behavior of crack front propagation. Both experimental compliance method and finite element analysis proved applicable for the fracture mechanism of adhesive assemblies under mode-III and mixed-mode III/II.

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Section: Resultsmentioning

confidence: 99%

The use of ECT and 6PBP tests to evaluate fracture behavior of adhesively bonded steel/epoxy joints under Mode-III and Mixed Mode III/II

Mehrabadi

2014

appl adhes sci

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“…The unique material property needed in this approach is G 13 . However, its effect on the measured G IIc was verified to be negligible (de Moura et al, 2006), which means that a typical value can be used rendering unnecessary to measure it.…”

Section: W O O D H E a D P U B L I S H I N G L I M I T E Dmentioning

confidence: 99%

“…Very refined meshes were considered in the region of interest corresponding to crack initiation and growth. The specimens' geometry and 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 Woodhead Publishing Limited; proof copy not for publication An analysis of G's distributions at the crack front showed a clear predominance of mode II along the specimens' width, although some spurious mode III exists at the specimens edges (de Moura et al, 2006 andSilva et al, 2007). 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 Woodhead Publishing Limited; proof copy not for publication…”

Section: Numerical Simulationsmentioning

confidence: 99%

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Interlaminar mode II fracture characterization

Moura

2008

Delamination Behaviour of Composites

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Multi-scale modelling of composite material systems Predictive modelling provides the opportunity both to understand better how composites behave in different conditions and to develop materials with enhanced performance for particular industrial applications. This important book focuses on the fundamental understanding of composite materials at the microscopic scale, from designing micro-structural features, to the predictive equations of the functional behaviour of the structure for a specific end-application. Chapters discuss stress and temperature-related behavioural phenomena based on knowledge of physics of microstructure and microstructural change over time. This study covers impact response, damage tolerance and failure of fibrereinforced composite materials and structures. Materials development, analysis and prediction of structural behaviour and cost-effective design all have a bearing on the impact response of composites and this book brings together for the first time the most comprehensive and up-to-date research work from leading international experts. Testing of composite materials can present complex problems but is essential in order to ensure the reliable, safe and cost-effective performance of any engineering structure. Mechanical testing of advanced fibre composites describes a wide range of test methods which can be applied to various types of advanced fibre composites. The book focuses on high modulus, high strength fibre/plastic composites and also covers highly anisotropic materials such as carbon, aramid and glass. Impact behaviour of fibre-reinforced composite materials and structures Mechanical testing of advanced fibre compositesDetails of these and other Woodhead Publishing materials books, as well as materials books from Maney Publishing, can be obtained by:• visiting our web site at www.woodheadpublishing.com • contacting Customer Services (e-mail: sales@woodhead-publishing.com; fax: +44 (0) W O O D H E A D P U B L I S H I N G L I M I T E D Cambridge EnglandWH-Delamination-Pre 6/6/08, 6:33 PM 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 Woodhead Publishing Limited; proof copy not for publication This book contains information obtained from authentic and highly regarded sources. Reprinted material is quoted with permission, and sources are indicated. Reasonable efforts have been made to publish reliable data and information, but the author and the publishers cannot assume responsibility for the validity of all materials. Neither the author nor the publishers, nor anyone else associated with this publication, shall be liable for any loss, damage or liability directly or indirectly caused or alleged to be caused by this book. W o o d h e a d P u b l i s h i n g L i m i t e dNeither this book nor any part may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, microfilming and recording, or by any information storage...

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“…However, its effect on the measured G IIc was verified to be negligible (de Moura et al, 2006), which means that a typical value can be used rendering unnecessary to measure it.…”

Section: Enf Testmentioning

confidence: 99%

Interlaminar mode II fracture characterization

Moura¹

2008

Delamination Behaviour of Composites

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SummaryDelamination is an important concern in the context of structural behaviour of laminated composite materials. It is known that delamination can diminish the stiffness and the strength of the material and promote structural failure. Delamination onset and growth is governed by interlaminar fracture toughness of the material. Delamination propagation is frequently dominated by mode II fracture; consequently interlaminar fracture characterization under mode II loading is fundamental to accurately predict the susceptibility of the material to delamination. However, there are several problems inherent to the usual tests employed for mode II interlaminar fracture characterization, e.g., unstable crack propagation and difficulties in crack monitoring during propagation.These issues are discussed in section 1.In section 2 the most popular fracture characterization tests in mode II are presented. A brief description of each one is given, with emphasis on the advantages and drawbacks thereof. The application of the classical data reduction schemes to each test is also described in section 2.1. After a succinct bibliographic review it is concluded that the End Notched Flexure (ENF) and End Loaded Split (ELS) tests are the most suitable ones to fracture characterization of composites in mode II. However, the dependence of 2 measured G IIc on the crack length measurements for those tests is emphasized. In order to overcome this serious disadvantage a new data reduction scheme based only on the specimen compliance is proposed in section 2.2. The method is applied with little differences to the ENF and ELS tests and provides a straightforward measurement of G IIc . Moreover, the method also includes the Fracture Process Zone (FPZ) effect, which was verified to be non negligible under mode II loading. In section 2.3 the referred tests were numerically simulated using a cohesive mixed-mode damage model. Appropriate values of critical strain energy release rates in mode I, II and III respectively, were inputted in the model. The main objective was to verify the capacity of the proposed methodology on the replication of the introduced G IIc . Excellent agreement was obtained for the two tests. The ENF test was proposed as the most suitable for the determination of G IIc owing to its simplicity.In section 3 the dynamic fracture characterization is discussed. The difficulties inherent in the conduct of experimental tests execution are highlighted. The determination of the dynamic fracture toughness of composites is useful when dynamic delamination propagation is the predominant failure mode. Several works of different authors are summarized. One of the remarkable points is related to the existence of a crack speed threshold value, below which the dynamic and quasi-static toughness values are similar.The majority of the authors indicate that fracture toughness tends to decrease with increasing crack speed.The main conclusions of this contribution are summarized in section 4.

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Equivalent crack based mode II fracture characterization of wood

Cited by 130 publications

References 16 publications

The use of ECT and 6PBP tests to evaluate fracture behavior of adhesively bonded steel/epoxy joints under Mode-III and Mixed Mode III/II

The use of ECT and 6PBP tests to evaluate fracture behavior of adhesively bonded steel/epoxy joints under Mode-III and Mixed Mode III/II

Interlaminar mode II fracture characterization

Interlaminar mode II fracture characterization

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