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Erratum to “CompTest 2006 special issue”
Available online at www.sciencedirect.com
Composites: Part A 38 (2007) 2382 www.elsevier.com/locate/compositesa
Erratum
Erratum to ‘‘CompTest 2006 special issue’’ Pedro P. Camanho
*
DEMEGI, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
This special issue should also have contained a further three papers, details of which are given below. The publishers regret that these articles were, by mistake, published in earlier issues of the journal. The publishers express their apologies to the authors for this mistake. The abstracts for those articles are given below. Vlasfeld DPN, Daud W, Bersee HEN, Picken SJ. Continuous fibre composites with a nanocomposite matrix: Improvement of flexural and compressive strength at elevated temperatures. Composites: Part A 2007;38:730–8. Polymer layered silicate nanocomposites can improve the flexural and compressive strength of continuous fibre reinforced composites by means of increasing the matrix modulus. A three-phase thermoplastic composite consisting of a main reinforcing phase of woven glass fibres and a PA6 nanocomposite matrix was fabricated. Flexural testing of a conventional PA6 fibre composite has shown a decrease of the flexural strength upon increasing temperature. This behaviour is associated with the decrease of the matrix modulus, especially above Tg. The nanocomposite used in this study has a modulus that is much higher than unfilled PA6, even above Tg and after moisture conditioning. The results showed that the fibre composites with a nanocomposite matrix have a more than 40% increased flexural and compressive strength at elevated temperatures. This also means that the temperature at which the materials can be used is increased by 40–50 °C. Therefore, by using a nanocomposite matrix the high temperature performance of fibre composites can be improved without any change in processing conditions. The combination with other advantages of nanocomposites in areas such as barrier properties, flammability and creep makes this a very attractive approach.
DOI of original articles: 10.1016/j.compositesa.2006.09.010, 10.1016/ j.compositesa.2006.11.008, 10.1016/j.compositesa.2007.04.006. * Tel.: +351 22 5081753; fax: +351 22 5081584. E-mail address: [email protected] 1359-835X/$ - see front matter Ó 2007 Elsevier Ltd. All rights reserved. doi:10.1016/j.compositesa.2007.09.005
Kintscher M, Ka¨rger L, Wetzel A, Hartung D. Stiffness and failure behaviour of folded sandwich cores under combined transverse shear and compression. Composites: Part A 2007;38:1288–95. For efficiently simulating the failure behaviour of sandwich structures made of stiff face sheets and a light-weight core, macroscopic material stiffness and strength values are essential. The investigated folded cores are made from Nomex paper coated with epoxy resin. Due to their channel-like structure, folded cores are air ventilated, which can help to reduce the danger of deterioration, which is a big advancement for applications in the aerospace industry. Folded core structures were tested under combined transverse compression and shear in order to get the stiffness values and the failure criterion under a multi-axial stress state. For this purpose a new test device was developed, which allows a simultaneous application of shear and compression loads. The test results are presented and discussed using a nonlinear description of the stiffness and failure behaviour of the folded core structure. Additionally, the results are compared to the stiffness and the failure behaviour of honeycomb cores. Kim J-H, Pierron F, Wisnom MR, Syed-Muhamad K. Identification of the local stiffness reduction of a damaged composite plate using the virtual fields method. Composites: Part A 2007;38:2065–75. In the present study, a damage detection problem is formulated as the identification of the spatial stiffness distribution in a damaged composite plate. Full-field heterogeneous curvature fields obtained from an optical deflectometry technique are processed by using the virtual fields method adapted to retrieve the 2D stiffness distribution map of a damaged carbon–epoxy plate. The method not only picks up the location of the damage but also provides a fairly good estimate of the stiffness reduction in the damaged area. In this paper, the procedure is described, validated on simulated measurements and some initial experimental results are given.
Composites: Part A 38 (2007) 2382 www.elsevier.com/locate/compositesa
Erratum
Erratum to ‘‘CompTest 2006 special issue’’ Pedro P. Camanho
*
DEMEGI, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
This special issue should also have contained a further three papers, details of which are given below. The publishers regret that these articles were, by mistake, published in earlier issues of the journal. The publishers express their apologies to the authors for this mistake. The abstracts for those articles are given below. Vlasfeld DPN, Daud W, Bersee HEN, Picken SJ. Continuous fibre composites with a nanocomposite matrix: Improvement of flexural and compressive strength at elevated temperatures. Composites: Part A 2007;38:730–8. Polymer layered silicate nanocomposites can improve the flexural and compressive strength of continuous fibre reinforced composites by means of increasing the matrix modulus. A three-phase thermoplastic composite consisting of a main reinforcing phase of woven glass fibres and a PA6 nanocomposite matrix was fabricated. Flexural testing of a conventional PA6 fibre composite has shown a decrease of the flexural strength upon increasing temperature. This behaviour is associated with the decrease of the matrix modulus, especially above Tg. The nanocomposite used in this study has a modulus that is much higher than unfilled PA6, even above Tg and after moisture conditioning. The results showed that the fibre composites with a nanocomposite matrix have a more than 40% increased flexural and compressive strength at elevated temperatures. This also means that the temperature at which the materials can be used is increased by 40–50 °C. Therefore, by using a nanocomposite matrix the high temperature performance of fibre composites can be improved without any change in processing conditions. The combination with other advantages of nanocomposites in areas such as barrier properties, flammability and creep makes this a very attractive approach.
DOI of original articles: 10.1016/j.compositesa.2006.09.010, 10.1016/ j.compositesa.2006.11.008, 10.1016/j.compositesa.2007.04.006. * Tel.: +351 22 5081753; fax: +351 22 5081584. E-mail address: [email protected] 1359-835X/$ - see front matter Ó 2007 Elsevier Ltd. All rights reserved. doi:10.1016/j.compositesa.2007.09.005
Kintscher M, Ka¨rger L, Wetzel A, Hartung D. Stiffness and failure behaviour of folded sandwich cores under combined transverse shear and compression. Composites: Part A 2007;38:1288–95. For efficiently simulating the failure behaviour of sandwich structures made of stiff face sheets and a light-weight core, macroscopic material stiffness and strength values are essential. The investigated folded cores are made from Nomex paper coated with epoxy resin. Due to their channel-like structure, folded cores are air ventilated, which can help to reduce the danger of deterioration, which is a big advancement for applications in the aerospace industry. Folded core structures were tested under combined transverse compression and shear in order to get the stiffness values and the failure criterion under a multi-axial stress state. For this purpose a new test device was developed, which allows a simultaneous application of shear and compression loads. The test results are presented and discussed using a nonlinear description of the stiffness and failure behaviour of the folded core structure. Additionally, the results are compared to the stiffness and the failure behaviour of honeycomb cores. Kim J-H, Pierron F, Wisnom MR, Syed-Muhamad K. Identification of the local stiffness reduction of a damaged composite plate using the virtual fields method. Composites: Part A 2007;38:2065–75. In the present study, a damage detection problem is formulated as the identification of the spatial stiffness distribution in a damaged composite plate. Full-field heterogeneous curvature fields obtained from an optical deflectometry technique are processed by using the virtual fields method adapted to retrieve the 2D stiffness distribution map of a damaged carbon–epoxy plate. The method not only picks up the location of the damage but also provides a fairly good estimate of the stiffness reduction in the damaged area. In this paper, the procedure is described, validated on simulated measurements and some initial experimental results are given.