|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Time-based Subcycle Formulation for Fatigue Crack Growth under Arbitrary Random Variable Loadings
||Yongming Liu, Karthik Rajan Venkatesan, Wei Zhang
|On-Site Speaker (Planned)
A time-based fatigue crack growth formulation and validation is proposed to calculate the fatigue crack growth under general random amplitude loadings. Several typical spectrums that are not appropriate for cycle-based FCG are illustrated, such as the “Christmas tree” spectrums. A sub-cycle formulation is then proposed to address this difficulty. The proposed model includes three major components: a time-based crack growth kinetics, an efficient crack tip opening displacement estimation, and a crack tip plasticity zone tracking algorithms for opening level of a moving crack. Several numerical examples are illustrated under different loading spectrums for the crack growth and CTOD calculation. In-house testing for “Christmas tree spectrum” and literature data on several representative variable loading spectrums are used for model validation. Random generated loading spectrums are used to illustrate the capability of the proposed model under arbitrary loadings. Finally, some conclusions and future work are drawn based on the proposed study.
||Planned: Supplemental Proceedings volume