In the context of the Damage Mechanics Challenge, we adopt a phase-field model of brittle fracture to blindly predict the behavior up to failure of a notched three-point-bending specimen loaded under mixed-mode conditions. The beam is additively manufactured using a geo-architected gypsum based on the combination of bassanite and a water-based binder. The calibration of the material parameters involved in the model is based on a set of available independent experimental tests and on a two-stage procedure. In the first stage an estimate of most of the elastic parameters is obtained, whereas the remaining parameters are optimized in the second stage so as to minimize the discrepancy between the numerical predictions and a set of experimental results on notched three-point-bending beams. The good agreement between numerical predictions and experimental results in terms of load-displacement curves and crack paths demonstrates the predictive ability of the model and the reliability of the calibration procedure.

翻译：在损伤力学挑战的背景下，我们采用相场脆性断裂模型，对混合模式加载下带缺口三点弯曲试件直至破坏的行为进行盲测预测。该梁采用基于烧石膏与水基粘合剂结合的地质架构石膏通过增材制造技术制成。模型中材料参数的标定基于一组可用的独立实验测试以及一个两阶段流程。第一阶段获得大部分弹性参数的估计值，而剩余参数在第二阶段进行优化，以最小化数值预测与一组带缺口三点弯曲梁实验结果之间的差异。数值预测与实验结果在载荷-位移曲线和裂纹路径方面的高度吻合，证明了模型的预测能力及标定流程的可靠性。