Abstract
Computational models based on the finite element method and linear or nonlinear fracture mechanics are herein proposed to study the mechanical response of functionally designed cellular components. It is demonstrated that, via a suitable tailoring of the properties of interfaces present in the meso- and micro-structures, the tensile strength can be substantially increased as compared to that of a standard polycrystalline material. Moreover, numerical examples regarding the structural response of these components when subjected to loading conditions typical of cutting operations are provided. As a general trend, the occurrence of tortuous crack paths is highly favorable: stable crack propagation can be achieved in case of critical crack growth, whereas an increased fatigue life can be obtained for a sub-critical crack propagation.
Highlights
Hard materials subjected to extreme loading conditions, high temperatures and severe impacts, as in case of cutting tools, have been the subject of extensive research to improve their performance
The fabrication procedure requires blending of graded powders of polycrystalline diamond and WC-10% Co with polymer binder, separately
In this study it has been shown that functionally designed micro-structures can offer enhanced mechanical properties as compared to traditional polycrystalline materials
Summary
Hard materials subjected to extreme loading conditions, high temperatures and severe impacts, as in case of cutting tools, have been the subject of extensive research to improve their performance. There is a lack of information about the effect of interface properties over multiple scales on the overall structural response Understanding this connection is of paramount importance in order to improve the mechanical properties by tailoring the interface characteristics. In this context, virtual testing using numerical methods taking into account the heterogeneous composition of the material is expected to be beneficial. A FE model based on linear elastic fracture mechanics (LEFM) accounting for interface crack propagation is devised For both failure mechanisms, stable and unstable crack growth, the presence of interfaces between the rods is found to be beneficial
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