Meso-scale features and couple stresses in fracture process zone
Generalized continuum theories such as couple stress theory have the potential to improve our understanding of material deformation and fracture behaviour in areas where classical continuum theory breaks down at,for example,the length scale of meso-scale features within the fracture process zone.The couple stress theory considers not only relative displacements between these features but also relative rotations,introducing a natural length scale.A model has been developed of a low stiffness matrix containing suitably situated high stiffness particles to simulate the presence of defects at the meso-scale.This has been used to assess the descriptive potential of a novel consistent couple stress theory.The model has been subjected to a set of displacement fields selected to produce strain energies with varying contributions from the coupled stresses.The results demonstrate the effect of particle size to spacing ratio on the elastic energies.These can be used to evaluate the couple stress constant as well as validate the constant experimentally for specific materials.
generalized continuum meso-scale defects FE analysis strain-curvature energy size effect
Craig N Morrison Andrey P Jivkov John R Yates
Nuclear FiRST Doctoral Training Centre;Modelling and Simulation Centre Research Centre for Radwaste and Decommissioning;Modelling and Simulation Centre Modelling and Simulation Centre
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）