Abstract
In this contribution, the ratcheting behavior and local field distribution of unidirectional metal matrix composites are investigated under cyclic loading. To that end, we extended the finite-volume direct averaging micromechanics (FVDAM) theory by incorporating the rule of nonlinear kinematic hardening. The proposed method enables efficient and accurate simulation of the ratcheting behavior of unidirectional composites. The local satisfaction of equilibrium equations of the FVDAM theory facilitates quick and rapid convergence during the plastic iterations. To verify the proposed theory, a finite-element (FE) based unit cell model is constructed with the same mesh discretization. The remarkable correlation of the transverse response and local field distribution generated by the FVDAM and FE techniques demonstrates the effectiveness and accuracy of the proposed models. The stress discontinuities along the fiber/matrix interface that are generic to the finite-element theory are absent in the FVDAM prediction. The effects of thermal residual stresses induced during the consolidation process, as well as fiber orientations, are revealed. The generated results indicate that the FVDAM is well suited for simulating the elastic-plastic ratcheting behavior of metal matrix composites, which will provide the conventional finite-element based technique with an attractive alternative.
Highlights
Metal matrix composites have become and will continue to be one of the most attractive alternatives to conventional materials for many applications in engineering such as turbine engine components, pressure pipelines and vessels
In order to verify the effectiveness of the finite-volume direct averaging micromechanics (FVDAM) theory to accurately predict both the homogenized stress–strain curve and local field distribution, a finite-element unit cell model is built with the same mesh discretizations, providing a golden standard for the FVDAM simulation
The influence of the thermal residual stresses on the cyclic response of the present material system is negligible under the transverse loading case
Summary
Metal matrix composites have become and will continue to be one of the most attractive alternatives to conventional materials for many applications in engineering such as turbine engine components, pressure pipelines and vessels. In this research, the FVDAM is further extended to incorporate the ratcheting plasticity model, which allows efficient and accurate simulations of the thermo-mechanical cyclic behavior of the metal matrix composites. The proposed model enables the prediction of global ratcheting effects and provides local information of the microstructures of the metal matrix composites. The cyclic plastic constitutive model is implemented successfully into the FVDAM theory for the first time, giving the FVDAM the ability to simulate the cyclic behavior of the metal matrix composites. In order to give the FVDAM model the capability of simulating the ratcheting effect, a cyclic plastic constitutive relation should be implemented in this model when calculating the plastic strain increment dε pl (q) (η, ξ ) in Equation (18).
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
