A FORCE CONTACT-BASED DISCRETE ELEMENT METHOD FOR ANALYZING THE MECHANICAL PROPERTIES OF CEMENTITIOUS MATERIALS
Cementitious material consists of particulate elements and demonstrates heterogeneous property on the levels of the microstructure and mesostructure.Several programmes based on discrete element method (DEM) are designed to generate the structure and to simulate the mixing or flow of granular materials.Recently,a concurrent algorithm-based DEM is successfully applied to simulate particle packing phenomenon.The surface of objects is no longer described by a mathematical function (such as in case of a sphere),but by a set of interconnected surface elements.By this way any shape can be described.Moreover,inter-particle contacts are force-based rather than impulse-based. The current work aims at using the force-based DEM to analyze mechanical properties ofcementitious materials.Usually,the influence of the particle structure on mechanical properties is analyzed with the aid of finite element method after generating the mesostructure.Unfortunately,sometimes the correct results are still not achieved in the case of too many elements involved because of geometric difficulties. In the force-based DEM system,all the particles and boundary walls have been covered by a layer with so-called contact thickness to realize the interactions between particles,so that rigid particles possess deformation character.If the cementitious matrix is also described by angular particles with contact thickness,all fields are covered by discrete particles with deformable property.The relationship between total load and displacement can be obtained.Obviously,the bearing capacity depends on properties of particles (including matrix-particles).The appropriate properties will be endowed to the particle after some validation with other experimental approaches.Furthermore,the crack formation and propagation,the spallmg and incorporating fibers and air void are also expected to be explored by this method.As demonstration,a cube or tile is first generated by dynamic packing system,then matrix are constructed with angular particles.Fundamental mechanical properties will be presented in this paper.
Cemetitous material force-based discrete element method mechanical property
Z.Guo H.He M.Stroeven P.Stroeven
Faculty of Civil Engineering and Geosciences,Delft University of Technology,Stevinweg 1,2628 CN,Delft,The Netherlands
国际会议
第二届国际非均质材料力学会议(The Second International Conference on Heterogeneous Material Mechanics)
安徽黄山
英文
1485
2008-06-03（万方平台首次上网日期，不代表论文的发表时间）