Characterisation, significance and detection of manufacturing defects in Reaction Sintered Silicon Carbide armour materials

Crouch, Ian; Kesharaju, Manasa; Nagarajah, Romesh

doi:10.1016/j.ceramint.2015.06.083

Cited by 38 publications

(10 citation statements)

References 5 publications

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“…Among the various methods used to extract features in the NDT signal processing, most success reports relate to the use of wavelet transform (Liu et al 2013, Farley et al 2012, Acciani et al 2010, Barry et al 2015, Crouch et al 2015, Duda et al 2001, Vejdannik and Sadr 2016d. In fact, due to the properties of most NDT signals (these signals are non-stationary) which often led to the distribution of information at specific resolution levels, energy is often concentrated in a small number of samples.…”

Section: 3features Extraction Methodsmentioning

confidence: 99%

“…But depending on the signal and the specific features that it has, each of these classifiers can achieve better result. For example, each of the MLP, RBF (Su et al 2013), PNN, FCM (Karray and De Silva 2004), SVM, OPF (Nunes et al 2013), LDA (Crouch et al 2015) and Bayesian (Nunes et al 2013, Bustillo et al 2014a classifiers can, in turn, have successful results by taking into account the characteristics of their classes. However, the reports obtained in (Nunes et al 2013) demonstrate that the Bayesian classifier has a higher accuracy than the OPF, and the OPF classifier provides a higher accuracy than the SVM classifier.…”

Section: 5classification Methodsmentioning

confidence: 99%

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Signal Processing for NDE

Vejdannik¹,

Sadr²,

Albuquerque³

et al. 2018

Handbook of Advanced Non-Destructive Evaluation

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Nowadays, testing and evaluating of industrial equipment using nondestructive tests, is a fundamental step in the manufacturing process. The complexity and high costs of manufacturing industrial components, require examinations in some way about the quality and reliability of the specimens. However, it should be noted, that in order to accurately perform the nondestructive test, in addition to theoretical knowledge, it is also essential to have the experience and carefulness, which requires special courses and experience with theoretical education. Therefore, in the traditional methods, which are based on manual testing techniques and the test results depend on the operator, there is the possibility of an invalid inference from the test data. In other words, the accuracy of conclusion from the obtained data is dependent on the skill and experience of the operator. Thus, using the signal processing techniques for nondestructive evaluation (NDE), it is possible to optimize the methods of nondestructive inspection, and in other words, to improve the overall system performance, in terms of reliability and system implementation costs. In recent years, intelligent signal processing techniques have had a significant impact on the progress of nondestructive assessment. In other words, by automating the processing of nondestructive data and signals, and using the artificial intelligence methods, it is possible to optimize nondestructive inspection methods. Hence, improve overall system performance in terms of reliability and Implementation costs of the system. This chapter reviews the issues of intelligent processing of nondestructive testing (NDT) signals.

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Section: 3features Extraction Methodsmentioning

confidence: 99%

Section: 5classification Methodsmentioning

confidence: 99%

Signal Processing for NDE

Vejdannik¹,

Sadr²,

Albuquerque³

et al. 2018

Handbook of Advanced Non-Destructive Evaluation

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“…O desenvolvimento de blindagens cerâmicas tornou os sistemas de proteção mais leves e eficientes em comparação com as blindagens metálicas convencionais [1][2][3]. As blindagens cerâmicas geralmente são compostas por duas partes: uma camada de cerâmica apoiada e uma placa de apoio metálica (liga de alumínio ou aço) ou um polímero reforçado com fibra [4]. A cerâmica constitui a primeira camada da armadura, sua função é fragmentar o projétil e absorver a energia inicial do impacto.…”

Section: Introductionunclassified

Desempenho balístico de estruturas multicamadas à base de alumina/epóxi

et al. 2019

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Resumo Alumina é comumente utilizada em blindagens compostas. Apresenta baixa tenacidade à fratura e esta propriedade está relacionada à resistência a múltiplos disparos. Com o intuito de melhorar a durabilidade em campo uma alternativa seria utilizar cerâmicas multicamadas. Neste estudo foi avaliado o desempenho balístico de estruturas multicamadas à base de alumina/epóxi e o efeito da adição de fibra de vidro como material de reforço. Os resultados foram comparados com placas de alumina individual de mesma espessura total que os sistemas multicamadas. O desempenho balístico dos painéis em mosaico de Al2O3/Al foi avaliado por meio de ensaio balístico DOP (depth of penetration) com projétil 7,62 mm perfurante. Os resultados indicaram que as placas individuais apresentaram melhor desempenho. No caso das estruturas Al2O3/epóxi, a resistência balística diminuiu com a redução da espessura das lâminas de alumina e com o aumento da camada de epóxi. A fibra de vidro não apresentou efeito significativo no desempenho.

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“…Over the last several years, ceramic materials have been used more frequently in various industrial sectors, including the medical (femoral heads and acetabular cups for total hip replacement, dental implants and restorations, bone fillers and scaffolds for tissue engineering), 1 automotive (knock sensors, oxygen sensors, exhaust gas catalysts, and silicon nitride parts for automotive engines), 2 or military (opaque and transparent armors). 3,4 These materials are primarily oxide ceramics [5][6][7] as well as some non-oxide ceramics, such as carbides, nitrides, borides, or a combination of these. [8][9][10][11] In terms of the price-performance ratio, one of the most cost-effective ceramic materials is alumina.…”

Section: Introductionmentioning

confidence: 99%

Restraining of calcium contamination in near‐net shape alumina ceramics during slip casting

Drdlík

Roleček

Drdlíková

et al. 2018

Int J Applied Ceramic Tech

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The traditional method for shaping ceramics is by slip casting on gypsum molds; however, its application for near‐net shaping of ceramic components is limited due to contamination by calcium ions. The focus of this study is the modification of the mold to limit Ca2+ contamination and to maintain favorable sucking properties. Cement was added to a standard gypsum mold to suppress its erosion, and a decrease in the sucking rate was observed due to its reduced macroporosity. The highest values of green densities were obtained at gypsum/cement weight ratios of 90/10 and 70/30. The microstructure analysis showed that alumina blocks prepared from the molds containing higher quantities of cement (30 or 50 wt%) were resistant to abnormal grain growth caused by Ca2+ contamination from the gypsum. The gypsum/cement mixtures for making molds for slip casting significantly limit mold erosion due to a lower sucking rate and abnormal grain growth of the slip cast samples because of the decreased diffusivity of Ca2+ ions. Therefore, the present modification of the mold renders the slip casting method more suitable for the near‐net shaping of ceramics.

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Characterisation, significance and detection of manufacturing defects in Reaction Sintered Silicon Carbide armour materials

Cited by 38 publications

References 5 publications

Signal Processing for NDE

Signal Processing for NDE

Desempenho balístico de estruturas multicamadas à base de alumina/epóxi

Restraining of calcium contamination in near‐net shape alumina ceramics during slip casting

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