Issue 18

Frattura ed Integrità Strutturale, 18 (2011); Notiziario 84 R ESOCONTO DELLE ATTIVITÀ TC-ESIS 2010-11 ESIS TC 8: Numerical Methods Protocol of TC8 Workshop on Numerical Methods for Materials Failure Ecole des Mines Paris, 14 th .-15 th . April, 2011 The two-day workshop was focused on formulation and application of cohesive zone models for fracture and fatigue of most different materials under various loading conditions. 18 papers from 6 countries were presented and discussed intensively. The paper should be published in a special issue of an international journal. A list of the presentations is enclosed in this protocol. After the workshop plenary sessions were organized to setup a round robin which was initiated some time ago. It was decided to start a new round robin, as the first step, on modeling plane stress mode I ductile fracture process in a CT specimen using cohesive zone models. Based on the round-robin the cohesive zone model should find higher popularity and more acceptance in the mechanics community and, furthermore, to promote research in cohesive zone model for material failure modeling. The stress-strain curve as well fracture energy release rate will be given, the round robin participants should predict the load-load line displacement curve based on cohesive zone models. A group with 8 institutions has been built. Further details will be communicated in the round robin group. Should additional research group or individual be interested in the activity, he/she may send a notice to h.yuan@uni-wuppertal.de , before the end of April. The first task should be finished in 2011. Further activities will be defined based on the first results. The next TC8 meeting will be organized in June 2012, together with TC1, at BAM Berlin. ESIS TC24: Integrity of Railway Structures Meeting 3-4 March 2011: “Predicting real world axle failure and reliability - A pan-European ESIS TC24 rail workshop: 3 - 4 March 2011” On 3-4 th March 2001, a meeting of TC24 has been hosted in London by RSSB (Rail Safety Standard Board). The workshop was based around new RSSB research work which, for the first time, allows railway engineers to understand the complex loading and environment of railway axles. The meeting has been the opportunity to show that RSSB research provides quantified models, based on first principles, for the damage to railway axles caused by corrosion and by mechanical impacts and to compare it with other approaches. Moreover, other technical presentations allowed to better understand the overall importance and mutual relationship among corrosion fatigue, NDT controls and fleet management and safety. The workshop has been organized into 5 sessions attended by almost 70 technical staffs and a handful of academics. List of presentations – Day 1 Welcome Len Porter, Chief Executive, RSSB Axle fatigue overview Prof. Rod Smith, Imperial College, London The technical context for RSSB’s work Ken Timmis, Rolling Stock Engineer, RSSB Accurate prediction of axle load spectra Mathew Beagles, DeltaRail How good are axle non-destructive testing techniques? John Rudlin, TWI Early laboratory studies of corrosion fatigue Dr Michele Carboni, Politecnico di Milano Corrosion fatigue and European axle steels Prof. Stefano Beretta, Politecnico di Milano Damage quantification on real railway axles John Davenport, TWI Technical challenges in the Axle Safety Model Andrew Watson, DeltaRail List of presentations – Day 2 Railway axle failures caused by corrosion and corrosion fatigue – the German experience Dr Katrin Maedler, Deutsche Bahn GB axle failures caused by corrosion fatigue Andrew Watson, DeltaRail Experience on axle defects Roy Archer, Applied Inspection Serco’s approach to life cycle costs and corrosion John Benyon / Adam Beagles, Serco LURSAK : The new high performances axle protection Mr S Cantini, Lucchini RS Demonstration of the Axle Safety model Andrew Watson, DeltaRail