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SUMMARY:A hyperplasticity framework for efficient modelling of cyclic load
 ing ratcheting - Dr Christelle Abadie\, CUED
DTSTART:20230120T140000Z
DTEND:20230120T150000Z
UID:TALK193570@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Modelling of the non-linear response on loading\, hysteretic b
 ehaviour on unloading and reloading\, and the phenomenon of ratcheting und
 er very many cycles is a challenge. First\, because of the non-linearity a
 nd the difficulties in devising a plasticity model that is thermodynamical
 ly robust\, but mostly\, because of the computational cost involved in mod
 elling large number of cycles. This talk presents a theoretical framework 
 to describe the response of a one dimensional mechanical system under cycl
 ic loading. The methods are formulated within the hyperplasticity framewor
 k\, which is first detailed and explained. The model can be expressed in t
 he form of general incremental relationships\, can therefore be applied wi
 thout modification directly to any loading history\, and can be readily im
 plemented within a time-stepping numerical code. A rigorous procedure is d
 escribed to accelerate the ratcheting process\, so that the effects of ver
 y large numbers of cycles can be analysed through a reduced number of cycl
 es. A generalisation from unidirectional to multidirectional loading is de
 scribed\, together with a tensorial form for application to material model
 ling. The original motivation was for the application to design of piles u
 nder lateral loading\, and an example of this application will be presente
 d. However\, the model is equally applicable to many other problems involv
 ing uni-directional or bi-directional cyclic loading in which the system e
 xhibits a similar character of hysteretic behaviour\, with ratcheting unde
 r large numbers of cycles.\n\n-----\n\n\nDr. Christelle Abadie is an assis
 tant professor in civil engineering at the University of Cambridge. She ho
 lds an Engineering degree from the French “Grandes Ecoles” ENSTA Paris
 Tech\, and a D.Phil from the University of Oxford. During her PhD\, she st
 udied the response of monopile foundations to long-term cyclic lateral loa
 ding (HARM model)\, and continued studying offshore wind monopiles through
  a PDRA at Oxford\, working on the PISA2 project (Pile Soil Analysis). Her
  current research activities focus on geotechnics for sustainable\ninfrast
 ructure development in the context of climate change and include pile desi
 gn under seismic loads for wind energy applications\, onshore wind turbine
  foundation design and sensing of climate-change induced geo-hazards. Chri
 stelle works with a range of industry partners\, in order to ensure knowle
 dge transfer from academia to practice. She is a fellow of Fitzwilliam Col
 lege and the academic representative of the Offshore Engineering Society.\
 n
LOCATION:Oatley Seminar Room\, Department of Engineering
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