Abstract
In this study, a novel approach for generating Representative Volume Elements (RVEs) is introduced. In contrast to common generators, the new RVE generator is based on discrete methods to reconstruct synthetic microstructures, using simple methods and a modular structure. The plain and uncomplicated structure of the generator makes the extension with new features quite simple. It is discussed why certain features are essential for microstructural simulations. The discrete methods are implemented into a python tool. A Random Sequential Addition (RSA)-Algorithm for discrete volumes is developed and the tessellation is realized with a discrete tessellation function. The results show that the generator can successfully reconstruct realistic microstructures with elongated grains and martensite bands from given input data sets.
Highlights
Most modern steels utilize different phases to improve their mechanical properties for their use case
The results of this study show, that the Representative Volume Elements (RVEs) generator invented at Integrity of Materials and Structures (IMS) is able of reconstructing microstructures from a given input data set
In this study it was discussed that common RVE-generators are lacking some features that are essential when ductile damage or fatigue crack initiation is to be described on the basis of microstructural simulations
Summary
Most modern steels utilize different phases to improve their mechanical properties for their use case. While the combination of hard and soft phases has a very valuable influence on the hardening behavior and the ultimate tensile strength of the material, the phase boundaries lead to damage initiation [3]. When it comes to fatigue properties the presence of multiple phases becomes a complicated circumstance. The influence on fatigue of a second phase was described much less not to speak of the combination of non metallic inclusions and a second phase [9] The reason for this is the fact that an experimental study of the influence of interactions between multiple phases is very complex and requires sophisticated and expensive measurement techniques. A systematic variation within a microstructure can be necessary for a detailed description of the microstructure behavior under loading [10,11]
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