Dynamic delamination fracture toughness in unidirectional polymeric composites

Tsai, Jia-Lin; Guo, Chao; Sun, C. T.

doi:10.1016/s0266-3538(00)00197-4

Cited by 64 publications

(25 citation statements)

References 7 publications

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“…Although the majority of the studies point to a decrease of the fracture toughness with increasing load rate there is no unanimity about this topic. Some authors observed the opposite trend (Corigliano et al, 2003) and others detected no remarkable influence of crack speed on toughness (Tsai et al, 2001). Although some of these discrepancies can eventually be explained by different behaviour of the tested materials, and the attained crack speed values, it is obvious that more profound studies about the subject are necessary.…”

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: 97%

“…This was considered consistent, because in unidirectional lay-ups crack initiation and growth occurs in the matrix. Tsai et al (2001) used a modified ENF specimen to determine the mode II dominated dynamic delamination fracture toughness of fiber composites at high crack propagation speeds. A strip of adhesive film with higher toughness was placed at the tip of interlaminar crack created during laminate lay-up.…”

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%

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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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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: 97%

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%

Interlaminar mode II fracture characterization

Moura

2008

Delamination Behaviour of Composites

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“…They observed a sharp decrease of dynamic toughness values relatively to the quasi-static ones. In fact, Tsai et al, (Tsai et al, 2001) used a modified ENF specimen to determine the mode II dominated dynamic delamination fracture toughness of fiber composites at high crack propagation speeds. A strip of adhesive film with higher toughness was placed at the tip of interlaminar crack created during laminate lay-up.…”

Section: Dynamic Mode II Fracture Characterizationmentioning

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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“…So far, static and quasi-static fracture behaviors of polymer composites have been extensively investigated, while the dynamic delamination toughness of polymer composites has not yet received as much attention [24]. With the increasing applications of polymer composites, it is necessary to understand their dynamic behaviors under localized impact loadings such as that imparted by a dropped tool or runway debris.…”

Section: Introductionmentioning

confidence: 99%

“…The transient critical ERRs were extracted by relating the real-time crack tip displacement field measured by the CGS system. Recently, using the ENF specimen configuration, Tsai et al [24] introduced an efficient method to capture the mode II and mixed-mode crack growth history by directly depositing an array of conductive aluminum lines created by the vapor deposition technique on the crack growth path. They found that the values of the dynamic mode II fracture toughness of the unidirectional S2/8553 glass/epoxy and AS4/3501-6 carbon/epoxy composites are basically equal to the static ones and not significantly affected by crack speeds up to 1100 m/s.…”

Section: Introductionmentioning

confidence: 99%

Determination of dynamic delamination toughness of a graphite‐fiber/epoxy composite using Hopkinson pressure bar

Dzenis

2005

Polymer Composites

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Modified dynamic three-point-bending and compact shearing test configurations based on Hopkinson pressure bar (HPB) and crack detection gage (CDG) (Vishay Intertechnology, Inc.) were used for the determination of the dynamic mode I and mode II delamination-initiation toughness of a unidirectional graphite-fiber/epoxy composite made of P7051S-20Q-1000 prepregs (Toray Composites America). The transient loading history was recorded precisely by the HPB installed with a high-resolution digital oscilloscope, and the crack initiation and delay time were captured using the CDG. By means of dynamic finite-element analysis (FEA) of the impact processes with the loading history and crack initiation time as input, the critical dynamic stress intensity factors (DSIFs) (K IDC /K I-IDC ) were extracted from numerical results of the crack opening displacements (CODs). Results show that under the present transient loadings, the K IDC value is about 80-90% of the static one, while the K IIDC value is nearly unchanged. Dynamic failure mechanisms of the composite specimens were evaluated by fractography using a scanning electron microscope (SEM).

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Dynamic delamination fracture toughness in unidirectional polymeric composites

Cited by 64 publications

References 7 publications

Interlaminar mode II fracture characterization

Interlaminar mode II fracture characterization

Interlaminar mode II fracture characterization

Determination of dynamic delamination toughness of a graphite‐fiber/epoxy composite using Hopkinson pressure bar

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