فهرست مطالب r. barkhordari

In this research, the evolution of damage and martensitic transformation of AISI 304, 316 and 321 stainless steels have been studied experimentally and numerically at room temperature. At first stage, the standard tensile tests have been performed and in the second stage the XRD has been tested and the available phases and the volume fraction of martensite have been obtained. The tensile tests have been performed for a variety of loading-unloading elongation. Damage is obtained using this loading-unloading slop. The graph of force-deformation has been achieved. The samples were cut by water jet machine and the X-ray diffraction tests have been performed on the stretched samples to obtain the volume fraction of martensite. Numerical simulations have been performed by the implementing the UMAT code in ABAQUS. In the simulations, the properties achieved from experimental tests are employed. The numerical simulations have two separated sections: damage-plastic and martensitic phase transformation. In this research, these two phenomena are considered simultaneously. This model can explain both phenomena at ambient temperature. The verifications have been compared simulation results with experimental data.