The damage and crack resistance improvement of bioactive glass is of prime importance, particularly when applied to the repair of load-bearing bones. The present contribution is focused on the prediction of damage mechanisms and crack resistance under uniaxial compression of bioactive glass matrix composites reinforced with a particulate phase. In order to characterize the effects of voids and particles on the damage mechanisms and the macro-response, a two-step homogenization is performed by considering the two phases existing at two different scales: micro/meso through the homogenization of the porous matrix and then meso/macro through the periodic micro-field approach. The damage in the bioactive glass matrix is computed via an anisotropic stress-based damage model, implemented into a finite element program. Failure resulting of excessive damage accumulation in the bioactive glass matrix is predicted by a critical damage criterion combined with a vanishing element technique. The implication of particles in the toughening mechanism as well as the damage and crack resistance improvement in this class of porous biomaterials is highlighted via a parametric study using the proposed numerical model.

提高生物活性玻璃的抗损伤性和抗裂性至关重要，特别是在用于承重骨骼的修复时。目前的贡献集中在预测由颗粒相增强的生物活性玻璃基复合材料在单轴压缩下的破坏机理和抗裂性。为了表征空隙和颗粒对损伤机理和宏观响应的影响，通过考虑存在于两个不同尺度的两个相来进行两步均质化：通过多孔基质均质化的微观/中间相，然后中/宏观通过周期性微场方法。通过基于各向异性应力的损伤模型计算生物活性玻璃基质中的损伤，并将其实施到有限元程序中。通过临界破坏标准结合消失元素技术，可以预测由于生物破坏性玻璃基质中过多的破坏积累而导致的失效。通过使用所提出的数值模型进行的参数研究，强调了这类多孔生物材料中颗粒在增韧机理中的含义以及损伤和抗裂性的改善。