59 research outputs found
Quantifying the high-temperature separation behavior of lamellar interfaces in -TiAl under tensile loading by molecular dynamics
No full textThis software is supplementary material for the publication
Quantifying the high-temperature separation behavior of lamellar interfaces in -TiAl under tensile loading by molecular dynamics by Ganesan, H., Scheider, I., Cyron, C.J. published at Frontiers in Materials
The python file cl_cohesive.py contains a class for calculating the traction-separation behavior of material points.
The class is named cohesive and contains a number of attributes and methods.
Some of the attributes are parameters to be given at initialization,
others are variables, which are calculated during the evolution of separation.
More information is given in the README file.
The code has been used to create the plots that contain traction-separation curves in the above publication
Micromechanical based derivation of traction-separation laws for cohesive model simulations
No full textAbstractA general method is proposed for the derivation of traction-separation laws for cohesive models, which is based on numerical simulations of a representative volume element with heterogeneous microstructure. The failure of this microstructure may involve various damage mechanisms, which are to be included in the simulation. From the mesoscopic response of the micromechanical model the complete traction-separation law is extracted, which in general depends on the applied triaxiality and other field quantities like loading rate. The derived traction-separation law can then be used in structural finite element analyses, where the microstructure is not modelled explicitly anymore. Instead of that, phenomenological material laws are included, namely the failure in such simulations is modelled by cohesive interface elements obeying the micromechanically derived traction-separation law identified before
Novel approach for the treatment of cyclic loading using a potential-based cohesive zone model
No full textAbstractThe development of cohesive zone models in the finite element framework dates back some 30 years, and cohesive interface elements are nowadays employed as a standard tool in scientific and engineering communities. They have been successfully applied to a broad variety of different materials and loading scenarios. However, many of such constitutive models are simply based on traction-separation relations without deducing them from energy potentials. By way of contrast, a thermodynamically consistent cohesive zone model suitable for the analysis of low cycle fatigue is elaborated in the present contribution. For that purpose, a plasticity-based cohesive law including isotropic hardening/softening is supplemented by a damage model. First results of this new approach to cyclic loading will be presented illustrating the applicability to low cycle fatigue
Bruchmechanische Bewertung von Laserschweißverbindungen durch numerische Rißfortschrittsimulation mit dem Kohäsivzonenmodell
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Thermodynamically and variationally consistent cohesive zone models for large deformation
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