Macro-microparameters of nuclear graphite PFC2D model
Particle Flow Code(PFC)can well deal with the problem of mechanics of non-continuous media,and has unique advantages in simulating the damage and fracture process of nuclear graphite.In order to increase the convenience of using PFC 2D to simulate nuclear graphite,the rapid calibration of PFC2D micro-parameters can be achieved.Firstly.the orthogonal experiment with four factors and four levels is designed to analyze the relationship between the macro-parameters of nuclear graphite and the micro-parameters of PFC2D.Then,based on the established relationship between macro-microparameters of nuclear graphite,the three-point bending test of graphite IG11 is simulated by PFC2D,and the correctness of the relationship between macro-microparameters is verified from three aspects:displacement field deformation,load-displacement curve and fracture parameters.The results show that Young's modulus(E)increases linearly with the increase of the effective modulus(Ec),the tensile strength(σt)increases linearly with the increase of the bond tensile strength(σb)of the flat joint,and Poisson's ratio(ν)firstly increases and then decreases with the increase of the stiffness ratio(kn/ks).The numerical simulation results of displacement field variation and load-crack opening of displacement(P-CMOD)curve agree well with the test results.In addition,the maximum error of fracture parameters is not more than 3.57％.
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