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Revisiting the Side Crushing Test Using the Three-Point Bending Test for the Strength Measurement of Catalyst Supports

Abstract : NEXTLAB 2014-Advances in Innovative Experimental Methodology or Simulation Tools used to Create, Test, Control and Analyse Systems, Materials and Molecules NEXTLAB 2014-Innover dans le domaine de la méthodologie expérimentale et des outils de simulation pour créer, tester, contrôler et analyser des systèmes, matériaux et molécules Abstract — The side crushing test is commonly used to characterize the mechanical strength of catalyst supports. However its interpretation is complex for cylindrical supports due to their irregular geometry and the various fracture modes induced. A better analysis of the crushing test, altogether with a comparison of the results obtained with the three-Point Bending test (3PB) and an analysis of the defects present within the supports, provide a better interpretation of their crushing strength data. Experimental results show that two different fracture modes appear during the crushing test – one under bending configuration and one under crushing configuration – inducing a large scatter of the data. Moreover, a comparison with the 3PB test shows that the strength measured in crushing is lower and the scatter of the data is larger than the ones obtained in bending. This is a consequence of a Weibull size effect and of the presence of macro-defects within one type of the tested supports. It is concluded that an analysis of the fracture modes activated during crushing has to be carried out to obtain a correct distribution of the strength data. The presence of macro-defects within the micro-structure of the supports decreases drastically the crushing strength, while their influence on the bending strength is more limited. Re´ume´est d' e´rasement grain a` grain revisiteá l'aide du test de flexion trois points pour la me-sure de la re´istance des supports de catalyseurs — Le test d' e´rasement grain a` grain est couramment utilise´our caracte´iser la re´istance me´anique des supports de catalyseurs. Cependant, son interpre´ation est complexe pour les supports cylindriques du fait de leur geóme´rie irre´uliè re et des diffe´ents modes de rupture qu'elle induit. Une analyse de´ailleé du test d' e´rasement , ainsi qu'une comparaison avec les re´ultats obtenus par le test de flexion trois points et une analyse des de´auts pre´ents au sein des supports, permettent d' interpre´er plus pre´ise´ent les donneés de re´istance a` l' e´rasement obtenues. Les re´ultats expe´imentaux montrent la coexistence de deux diffe´ents modes de rupture lors du test d' e´rasement – un premier apparaissant sous configuration de flexion et un second apparaissant sous configuration de compression diame´rale – menant a` une large dispersion des valeurs. De plus, la comparaison avec le test de flexion trois points montre, d'une part, que la re´istance mesureé en e´rasement est plus faible et, d'autre part, que la dispersion des donneés est plus grande que celles obtenues en flexion. Ces caracte´istiques re´ultent d'un effet de taille ainsi que de la pre´ence de macro-de´auts au sein d'un des types de supports teste´il
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Submitted on : Thursday, July 16, 2015 - 3:01:29 PM
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D Staub, Sylvain Meille, Vincent Le Corre, Jérome Chevalier, Loic Rouleau. Revisiting the Side Crushing Test Using the Three-Point Bending Test for the Strength Measurement of Catalyst Supports. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2015, 70 (3), pp.475-486. ⟨10.2516/ogst/2013214⟩. ⟨hal-01176553⟩

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