Assessment of residual strength in impacted composite sandwich panels / Galib Abumeri in JEC COMPOSITES MAGAZINE, N° 37 (12/2007)

[article]  inJEC COMPOSITES MAGAZINE > N° 37 (12/2007) . - p. 56-58 Titre : Assessment of residual strength in impacted composite sandwich panels Type de document : texte imprimé Auteurs : Galib Abumeri, Auteur Année de publication : 2007 Article en page(s) : p. 56-58 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matière  plastique'  'Résistance  résiduelle'  Modélisation  'Propriété  mécanique'  'Etude  théorique'  Micromécanique  'Simulation  numérique'  'Plastique  alvéolaire'  Stratifié  'Matériau  renforcé  fibre'  Polymère  choc'  Endommagement  'Méthode  élément  fini'  'Modèle  'Panneau  sandwich'  composite' Index. décimale : 668.4 Plastiques, vinyles Résumé : Simulation of impacted composite panels and calculation of residual strength after impact is a complex and challenging computational process. Accurate prediction requires the integration of material modelling capability with an explicit finite-element dynamic solution, as well as damage tracking and fracture algorithms. A new computational methodology for assessing impact-related damage and determining residual strength after impact is discussed in this article. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14013 [article]

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Composite bridges : health monitoring and an evaluation of a temporary field repair system / Galib Abumeri in JEC COMPOSITES MAGAZINE, N° 28 (11/2006)

[article]  inJEC COMPOSITES MAGAZINE > N° 28 (11/2006) . - p. 35-37 Titre : Composite bridges : health monitoring and an evaluation of a temporary field repair system Type de document : texte imprimé Auteurs : Galib Abumeri, Auteur ; Rose Ragalini, Auteur Année de publication : 2006 Article en page(s) : p. 35-37 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Etude  théorique'  'Simulation  numérique'  'Méthode  élément  fini'  'Mécanique  rupture'  Modélisation  'Intégrité  structure'  Endommagement  Pont  Application  Réparation  Monitorage  'Matériau  composite' Index. décimale : 668.4 Plastiques, vinyles Résumé : Composite bridges offer many advantages compared to current steel and aluminium bridges, including lightweight and superior corrosion resistance. However, their use is challenged by damages due to punctures, impact loads, and deployment-related handling, dropping, and dragging. To address these challenges, a comprehensive research programme was undertaken to develop innovative field repair techniques. Note de contenu : - Methodology - DPS background - Evaluation of temporary field repair Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13920 [article]

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Computational approach for composite material allowables using sealed envelope predictions for reduced testing / Galib Abumeri in SAMPE JOURNAL, Vol. 45, N° 5 (09-10/2009)

[article]  inSAMPE JOURNAL > Vol. 45, N° 5 (09-10/2009) . - p. 26-35 Titre : Computational approach for composite material allowables using sealed envelope predictions for reduced testing Type de document : texte imprimé Auteurs : Galib Abumeri, Auteur ; M. Garg, Auteur ; Frank Abdi, Auteur ; A. McCloskey, Auteur ; R. Bohner, Auteur Année de publication : 2009 Article en page(s) : p. 26-35 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Composites  polymères'  'Simulation  par  ordinateur'  'Tests  réduits'  'Résistance  des  matériaux' Index. décimale : 668.4 Plastiques, vinyles Résumé : Accurate prediction of 1- and B-basis material allowables is essential for statistical characterization and risk reduction of structural aerospace materials. Current practices for determining allowables for polymer composites follow recommended procedures set forth by CMH-17 (formerly military handbook MIL-HKBK-17-1E) and FAA. The process is costly and time consuming as accurate determination of allowables requires physical testing of a large number of coupons for various layup configurations and test environments. Further, new composite materials are introduced to the market at a rapid rate amplyfying the need for timely cost effective approach. To mitigate time and cost associated with material allowable generation, Alpha STAR Corporation (ASC) and Northrop Grumman (NG) are cooperating in an effort to explore a novel computational method for predicting B-basis strength valeus of polymer matrix composites. The approach combines composites mechanics based progressive failure analysis (PFA), finite element analysis, probabilistic methods, and reduced testing to virtually generate coupon tests. To examine the validity of this approach the ASC-NG team used a "sealed envelope" process. Here, ASC made its predictions independent of test results and then handed them to NG for comparison against a "sealed envelope" of real test data. B-basis tensile strength values for un-notched and notched IM7/MTM45-1 coupons were predicted (using a reduced number of test replicates) and provided to the NG team. Predicted results were compared to those obtained using standard military specification practices and the standard number of test replicates. This computational approach has potential for simulation of all types of ASTM tests under various environmental conditions, potentially reducing the required number of test replicates by more than 67 %. The difference in the B-basis results obtained from prediction and those from current practices ranged from -5,8 % and -7,95 %. The average difference between th two results was less than -0,2 %. The difference between the two solutions was less than 1 % for 30 % of the test cases simulated. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7194 [article]

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Durability and reliability of large composite wind turbine blades / Galib Abumeri in SAMPE JOURNAL, Vol. 48, N° 6 (11-12/2012)  

[article]  inSAMPE JOURNAL > Vol. 48, N° 6 (11-12/2012) . - p. 7-14 Titre : Durability and reliability of large composite wind turbine blades Type de document : texte imprimé Auteurs : Galib Abumeri, Auteur ; Frank Abdi, Auteur Année de publication : 2012 Article en page(s) : p. 7-14 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse multiéchelle Composites à fibres de verre -- Propriétés mécaniques Durée de vie (Ingénierie) Eoliennes -- Matériaux Fiabilité Matériaux -- Fatigue Pales d'éoliennes Résistance des matériaux Rupture (mécanique) Index. décimale : 620.11 Matériaux (propriétés, résistance) Résumé : Because of its advantageous weight-to-stiffness and weight-to-strength ratios, the E-glass composite has become more attractive in the design of large wind turbine blade. In this paper, material characterization of E-glass composites was performed to determine the composite's static and fatigue properties. Also, durability and damage tolerance (D&DT) and fatigue life analyses based on a multi-scale progressive failure analysis (PFA) were performed to determine a large wind turbine blade made of E-glass composites : a) structural integrity, under 140 mph wind pressure, b) improved structural performance, under 140 mph wind pressure and c) fatigue life and the associated damage under 30-60 mph wind pressures. Note de contenu : - METHODOLOGY : Durability and damage tolerance (D&DT) analysis - Composite material calibration - static strength and stiffness calibration - RESULTS AND DISCUSSION : Large wind blade design configuration - Material static and fatigue calibration and qualification - Static property calibration of E-glass composite - Fatigue life of E-glass composite En ligne : http://enu.kz/repository/2011/AIAA-2011-1819.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16498 [article]

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