EFFECT OF LOADING RATE ON UPPER SHELF CRACK RESISTANCE OF STRUCTURAL STEELS WITH DIFFERENT YIELD STRENGTH AND MICROSTRUCTURE

On étudie l'influence de la vitesse de chargement sur les courbes JR-Ɗ a de différents aciers ayant des seuils d'écoulement compris entre 170 et 550 MPa. La longueur de fissure a été déterminée par la méthode des courbes maitresses qui est basée sur l'analyse des relations chargement-deplacement. Les valeurs J1 ont été obtenues par des mesures de la zone d'émoussement. L'influence de la vitesse de chargement est discutée en terme de J1 et dJ/da, en prenant en compte le mécanisme de rupture.The influence of loading rate on JR-Ɗa-curves of different steels with yield strengths between 170 and 550 MPa were investigated. The crack length was determined by the key curve method, which is based on the analysis of loaddisplacement relationship. Ji values were derived from "stretched-zone" measurements. The influence of loading rate is discussed by means of J1 and dJ/da, taking fracture mechanism into account

Investigating Graphs in Textual Case-Based Reasoning

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G.: Textual reuse for email response

Abstract. The case-based reasoning approach to email response consists of reusing past messages to synthesize new responses to incoming requests. This task presents various challenges due to the nature of the messages: Textual descriptions, multiple topics, heterogeneous content, variable text length and varying recurrence of the statements. In this paper, we address the problem of determining which portions of past cases are reusable. Our scheme consists of identifying parts of a past message and declaring them variable, optional or reusable. This formulation of case reuse corresponds, from an application point of view, to the dynamic creation of a response template from antecedent messages. We describe and compare two strategies for selecting the messages portions to be reused: Case grouping and condensation models. Our results indicate that the case grouping strategy is a better choice. We also describe some of our experiments for identifying variable parts, based on named entity extraction techniques.