Modeling Fracture Processes in Numerical Concrete
Modeling the fracture processes in concrete requires a material structure of concrete to start with.The material structure of concrete can be obtained either experimentally by X-ray computed tomography,or numerically by a computer simulation.A simplified way to represent the material structure of concrete is to put multiple spheres in a matrix,where the spheres are interpreted as aggregates.This assumption of the shape of aggregates might have influences on the fracture processes in concrete,such as the microcracks propagation path.Recently the Anm material model was proposed and implemented,which can produce a material structure of concrete with irregular shape aggregates.The irregular shape is represented by a series of spherical harmonic coefficients.The further mechanical performance evaluation would benefit from this more realistic material structure.In this paper a material structure of concrete is simulated by the Anm material model.A number of irregular shape particles are planted in a matrix.This material structure is then converted into a voxelized image.Afterwards a random lattice mesh is made,and three types of lattice elements are defined,which represent aggregates,matrix and interface respectively.A uniaxial tensile test is set up and simulated by fixing all the lattice nodes at the bottom of the specimen and imposing a prescribed unit displacement onto all the nodes at the top.The lattice fracture analysis gives the stress-strain response and microcracks propagation,from which some mechanical properties such as Youngs modulus,tensile strength and fracture energy can be predicted.
Lattice Fracture Tensile Test Simulation Irregular Shape Aggregates
Zhiwei Qian Erik Schlangen Guang Ye Klaas van Breugel
Materials innovation institute M2i,Delft,the Netherlands;Delft University of Technology,Delft,the Ne Delft University of Technology,Delft,the Netherlands
国际会议
北京
英文
1-6
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）