In this study, the mechanical behavior under monotonic loads of tungsten carbide‑cobalt (WC-Co) composites is investigated extensively by analyzing (1) nanoindentation tests on WC particles and Co matrix, (2) nanowires made of WC-Co composites tested in tension and (3) micropillars made of WC-Co composites tested in compression. To this end, a novel computational framework consisting of two different microplane constitutive models developed for WC and Co phases are proposed. For the Co matrix, the microplane J₂-plasticity, called the model MPJ2, and for the WC particles a modified version of the microplane model M7, called the model M7WC, are employed. Furthermore, finite element meshes in 3D obtained from experimental tomography reconstructions of WC-Co composites are employed to rule out any spurious geometric features that is likely to be encountered in artificially generated meshes. After calibrating the aforementioned models, it is shown that the finite element predictions not only confirm the extensive experimental observations but also shed further light into the mechanical behavior of these composites.

在这项研究中，碳化钨-钴 (WC-Co) 复合材料在单调载荷下的机械行为通过分析 (1) WC 颗粒和 Co 基体的纳米压痕测试，(2) 由 WC-Co 复合材料制成的纳米线在张力和 (3) 由 WC-Co 复合材料制成的微柱经过压缩测试。为此，提出了一种新的计算框架，该框架由为 WC 和 Co 相开发的两种不同的微平面本构模型组成。对于 Co 矩阵，微平面 J ₂-可塑性，称为 MPJ2 模型，对于 WC 颗粒，采用微平面模型 M7 的修改版本，称为模型 M7WC。此外，从 WC-Co 复合材料的实验断层扫描重建中获得的 3D 有限元网格用于排除人工生成的网格中可能遇到的任何虚假几何特征。校准上述模型后，表明有限元预测不仅证实了广泛的实验观察结果，而且进一步阐明了这些复合材料的力学行为。