stage 6 triennial report 1 July 2009–30 June 2012 ... - CHARMEC

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Materials and maintenance – Material och underhåll (MU) – Werkstoff und Unterhalt – Matériaux et entretien MU13. WhEEL AND RAIL MATERIALS AT LOW TEMPERATURES Hjul- och rälmaterial vid låga temperaturer Werkstoffe für Räder und Schienen bei niedrigen Temperaturen Matériaux des roues et rails aux basses températures The researchers in this senior project, which concluded in <strong>June</strong> 2006, were Dr (now Docent) Johan Ahlström and Professor Birger Karlsson from Chalmers Materials and Manufacturing Technology (for photo, see page 49). The influence of operating temperatures down to -40°C on fatigue and fracture behaviour was studied. High loading rates in service at -40°C were simulated by slow rig testing at -60°C. The low-cycle fatigue behaviour at low temperatures was examined for the most promising of the wheel materials from the previous project mu2. The joint reference group for projects mu13 and mu16 had members from Lucchini Sidermeccanica (Italy) and Bombardier Transportation Sweden. See also charmec’s Triennial Reports for Stages 3 and 4. 46 Preparation of a bar for fatigue testing in project MU13, starting with SiC grinding and finishing with diamond polishing. Rotating bar is shown in red and cooling water in blue Turnout crossing and finite element model of crossing nose, as studied in project MU14
Materials and maintenance – Material och underhåll (MU) – Werkstoff und Unterhalt – Matériaux et entretien MU14. DAMAGE IN TRACK SWITChES Skador i spårväxlar Schäden an Weichen Détérioration des aiguillages Docent (now Professor) Magnus Ekh and Professor Kenneth Runesson led project mu14. Its first part was concluded with Göran Johansson’s successful defence in public of his doctoral dissertation in September 2006. The title of the dissertation is “On the modeling of large ratcheting strains and anisotropy in pearlitic steel”. The faculty-appointed external examiner of the dissertation was Professor Bob Svendsen from the Faculty of Mechanical Engineering at the University of Dortmund, Germany. The project was then extended until <strong>June</strong> 2008 with Göran Johansson as part-time researcher. The mu14 project aimed to provide a fundamental basis for the development of track switches (turnouts) which permit longer inspection intervals, have fewer faults at inspection, involve lower maintenance costs, and cause less disruption in rail traffic. One component under severe loading conditions is the crossing nose. Here mathematical modelling and simulation of large deformations and damage due to cyclic loading have been carried out. In particular, thermodynamically consistent constitutive material models for describing the large-strain response of polycrystalline metals have been developed, with an emphasis on the multi-axial ratchetting (i e, accumulation of plastic yielding) under cyclic loading. The model parameters have been identified against experimental data for a pearlitic steel. MiniProf measurements of the dimensions of the crossing nose (made of manganese steel) have been made on a reference turnout uic60-760-1:15 at Alingsås on the Western Main Line in Sweden. Parallel measurements have been performed in Stockholm (sl track) on a crossing nose made of the pearlitic rail steel 900a. The latter exhibited significant and continuing deformations during a few months’ traffic while the former stayed almost unchanged. The research was carried out in collaboration with the turnout manufacturer vae in Austria and the Department of Materials and Manufacturing Technology at Chalmers. See also charmec’s Triennial Reports for Stages 3 and 4. The ts7 and mu14 projects had a joint reference group, see under ts7. Dr Göran Johansson (centre; doctorate earned in September 2006) and his supervisors Docent (now Professor) Magnus Ekh (right) and Professor Kenneth Runesson in project MU14. Photo taken in 2006 47
Page 1 and 2: stage 6 triennial report 1 July 200
Page 3 and 4: CONTENTS Foreword 2 Reflections fro
Page 5 and 6: REFLECTIONS from the Director In it
Page 7 and 8: INTRODUCTION CHARMEC is an acronym
Page 9 and 10: Faiveley Transport Nordic left the
Page 11 and 12: PROGRAMME AREAS ChARMEC STAGE 6 Acc
Page 13 and 14: During Stage 6, a committee from th
Page 15 and 16: Interaction of train and track - Sa
Page 23 and 24: PhD students Peter Torstensson of p
Page 25 and 26: Hamed Ronasi: Towards the identific
Page 27 and 28: functions with four free parameters
Page 31 and 32: Vibrations and noise - Vibrationer
Page 37 and 38: Astrid Pieringer and Wolfgang Kropp
Page 39 and 40: Materials and maintenance - Materia
Page 45: Materials and maintenance - Materia
Page 51 and 52: appointed external examiner of the
Page 53 and 54: fied for increased vertical and lon
Page 55 and 56: Nasim Larijani, Magnus Ekh and Erik
Page 57 and 58: anisotropy in the surface layer of
Page 59 and 60: used to identify both the critical
Page 61 and 62: Co-workers in projects MU26 and MU2
Page 63 and 64: Based on experimental findings with
Page 65 and 66: Martin Schilke and Johan Ahlström:
Page 67 and 68: PhD student Andreas Draganis (secon
Page 69 and 70: maintenance in the form of removal
Page 71 and 72: moderate influence on the predicted
Page 73 and 74: Systems for monitoring and operatio
Page 79 and 80: Shanghai metro train in the field t
Page 81 and 82: organic composite materials, the we
Page 83 and 84: Parallel EU projects - Parallella E
Page 89 and 90: Björn Paulsson and Anders Ekberg:
Page 93 and 94: Parallel special projects - Paralle
Page 95 and 96: Parallel special projects - Paralle
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Parallel special projects - Paralle
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The influence of C sb on statistica
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the current Indian sleeper design i
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INTERNATIONAL CONFERENCES During St
Page 109 and 110:
a turnover of 166 Msek (2011). The
Page 111 and 112:
Interfleet Technology charmec has g
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SPECIAL EVENTS AND AChIEVEMENTS (co
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An agreement was reached in Novembe
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ChARMEC STAGE 7 The Principal Agree
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Materials and maintenance MU Progra
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CHALMERS UNIVERSITY OF TECHNOLOGY 2
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stage 6 triennial report 1 July 2009–30 June 2012 ... - CHARMEC

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