2010 Volume 28 Issue 1 Pages 28-38
FEM-MD combined method is proposed for the microscopic stress analysis of steels. In this numerical method, Finite Element Method (FEM) is applied to the stress analysis inside grains, and Molecular Dynamics (MD) is applied to the calculation of the atomic configuration near the grain boundary in order to consider the microscopic heterogeneity and the deformation near the grain boundary that influences the stress distribution. Slip length between two grains caused by the mismatch of the displacement near the grain boundary is calculated by FEM. Slip resistance, which is necessary to calculate slip length, is obtained by calculating the atomic configuration near the grain boundary by MD. The combination of FEM and MD is realized by using slip resistance in FEM and slip length in MD. The validity of modeling of the deformation near the grain boundary is investigated by comparing the deformation near the grain boundary calculated by FEM-MD combined method to that observed in the experiment in the case of a load applied to the specimen. Calculated slip length coincides with measured one. FEM-MD combined method is applied to the investigation of the influence of change in the grain shape caused by the thermal history such as the weld zone upon the strength characteristic. The high stress region tends to increase in the case of the grain diameter larger and it is indicated that grain coarsening due to the weld thermal history increases the possibility of the crack initiation. FEM-MD combined method is expected to be helpful in investigating the mechanism of fracture or the strength characteristic of the complicated microstructure such as the weld zone by evaluating the microscopic stress distribution.