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Structural response of blast loaded composite containment vessels / Brendan O'Toole in SAMPE JOURNAL, Vol. 42, N° 4 (07-08/2006)

[article]  inSAMPE JOURNAL > Vol. 42, N° 4 (07-08/2006) . - p. 6-13 Titre : Structural response of blast loaded composite containment vessels Type de document : texte imprimé Auteurs : Brendan O'Toole, Auteur ; Mohamed B. Trabia, Auteur ; Jagadeep Thota, Auteur ; Trevor Wilcox, Auteur ; Kumarswamy K. Nakelswamy, Auteur Année de publication : 2006 Article en page(s) : p. 6-13 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : The development of efficient explosion resistant containers requires knowledge of dynamic material properties and the ability to simulate both the explosive loading and the corresponding structural response. A lightweight, transportable containment vessel could be used as an integral part of the response to bomb-related terrorist activities. Several composite vessel designs have been developed by the Russian Federal Nuclear Center (RFNC-VNIIEF) and explosive experiments have been performed on open ended cylinders for the purpose of benchmarking analysis methods. The objective of the work presented here is to determine the mechanical properties of the cylinder materials and to investigate different methods for computational simulation of the cylinder response to blast loading. The open ended cylinders are made from a basalt fiber-epoxy composite material with and without a steel inner liner. Computational simulation is performed using LS-DYNA. The predicted response of the composite structure matches experimental data closely for three different test cylinder configurations. Note de contenu : - CYLINDRICAL BLAST EXPERIMENTS - MATERIAL CHARACTERIZATION : General - Stainless steel properties - Basalt fiber/epoxy composite properties - COMPUTATIONAL SIMULATION : General modeling procedure - Explosive modeling procedure Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23469 [article]

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The development of a high performance bow sonar dome / David Conway in SAMPE JOURNAL, Vol. 42, N° 4 (07-08/2006)

[article]  inSAMPE JOURNAL > Vol. 42, N° 4 (07-08/2006) . - p. 20-22 Titre : The development of a high performance bow sonar dome Type de document : texte imprimé Auteurs : David Conway, Auteur ; F. W. Kingston, Auteur Année de publication : 2006 Article en page(s) : p. 20-22 Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : This paper describes the design and manufacture of the Bow Sonar Dome for the UK Royal Navy's Type 45 Destroyer shown in Figure 1. Due to the performance requirements, costs and practical considerations the dome shell was manufactured from glass fibre and low temperature curing epoxy resin using Resin Film Infusion (RFI). Due to the narrowness of the aft of the dome it was necessary to manufacture the dome in two pieces, the forward being laminated in a female mould and the afl consisting of a syntactic foam cure that was cast into a female mould, cured and over laminated with glass/epoxy by RFI. A combination acoustic baffle/internal support was manufactured using polyurethane anechoic elements as cores with a combination of carbon fibre braiding and carbon fibre cloth in a one shot vacuum infusion process using a vinyl ester resin. Note de contenu : - DESIGN - MANUFACTURE : Sonar dome shell - Aft fairing - Longitudinal baffle Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23470 [article]

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Composite marine impellers: manufacturing technology development (HIP and RTM processing) / Piet Van Dine in SAMPE JOURNAL, Vol. 42, N° 4 (07-08/2006)

[article]  inSAMPE JOURNAL > Vol. 42, N° 4 (07-08/2006) . - p. 33-43 Titre : Composite marine impellers: manufacturing technology development (HIP and RTM processing) Type de document : texte imprimé Auteurs : Piet Van Dine, Auteur ; Jeff Hall, Auteur ; Kevin L. Koudela, Auteur ; Greg Dillon, Auteur Année de publication : 2006 Article en page(s) : p. 33-43 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : Manufacturing technologies for the production of metallic high precision marine impeller designs have been successfully developed. The high degree of precision required to meet the performance criteria was achieved by 5-Axis machining of Powder Metal Hot Isostatically Pressed (PM HIP) billets into shroud and hub/blade sections, which are subsequently electron beam welded together and finish machined. This technique yields finish tolerances within 0.015 inches of the design. While the approach has been successful, the cost associated with the manufacture of an impeller are high. Alternative manufacturing techniques, such as precision casting and one piece molding of composite have been evaluated and prototype parts manufactured. Based on an assessment of technical requirements at that time these processes were concluded to be inadequate for providing acceptable part tolerances (given subsequently acquired information and recent unrelated developments alternative metal manufacturing techniques may not be acceptable). In order to meet both cost and quality requirements, Electric Boat invented a segmented composite impeller manufacturing approach. Initial trials with this technique showed promise of acceptably replacing the baseline technology. The Office of Naval Research sponsored a program to bring this manufacturing technique to maturity under the ManTech program. This effort developed high precision rapid tooling techniques for Resin Transfert Molded parts that were corrected for mold and part shrinkage/distortion. These high precision parts were then assembled to form an impeller. This paper will describe the basic technique, the efforts made to improve the tolerances, and the manufacturing process. Note de contenu : - BACKGROUND : Impeller - Impeller material change philosophy - Composite impeller design - Composite part manufacture for composite one piece impeller - Composite multi-piece impeller - MANUFACTURING TECHNOLOGY IMPROVEMENT - MATERIALS - SEGMENT CONFIGURATION : Distortion determination - Vane correction - TOOLING MANUFACTURE - IMPELLER MANUFACTURE - TESTING Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23488 [article]

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Slam testing of sandwich panels / Richard Downs-Honey in SAMPE JOURNAL, Vol. 42, N° 4 (07-08/2006)

[article]  inSAMPE JOURNAL > Vol. 42, N° 4 (07-08/2006) . - p. 47-55 Titre : Slam testing of sandwich panels Type de document : texte imprimé Auteurs : Richard Downs-Honey, Auteur ; Susan Edinger, Auteur ; Mark Battley, Auteur Année de publication : 2006 Article en page(s) : p. 47-55 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : This paper addresses issues associated with defining the dynamic behaviour of sandwich core materials for marine applications. In addition to the existing test methods employed to establish core shear properties at various strain rates, a new and novel procedure has been developed to test sandwich panels in a simulated slamming mode. The results of the tests on four core materials are compared using the different test methods. Comments on the suitability of the materials for use in slamming regions of marine vessels are made. Note de contenu : - INTRODUCTION : Purpose - Current standardised core shear test methods - Plate shear testing - Four-point bend testing - Experimental characterisation of slamming events - Servo-hydraulic slam testing system - EXPERIMENTAL : Specimens and materials - Slamming test procedure - Analysis and results - RESULTS : Determination of failure - TESTING RESULTS AND DISCUSSION Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23489 [article]

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