弓形钢纤维增强水泥基材料断裂能模型

Modeling Fracture Energy of Hooked End Steel Fiber Reinforced Cementitious Composites (HSFRCC)

摘要:

根据弓形钢纤维弯钩端变形情况对单根纤维拔出能量进行推导；应用概率统计方法综合评估了断裂面上各纤维的能量贡献，建立了相应的断裂能模型.试验验证表明，模型预测精度良好，且该断裂能模型与各细观参数，如纤维长度、弯钩端几何形状参数和水泥基体强度等密切相关，因此该模型不仅能用于预测弓形钢纤维增强水泥基材料的断裂能，还能用于该类材料的优化设计研究.

Abstract:

To model fracture energy of hooked end steel fiber reinforced cementitious composite (HSFRCC),pullout energy of single hooked end steel fiber (HSF) with nondeformed/deformed hooked end was theoretically derived first.Then,statistic method was employed to estimate energy contributions from all HSFs on crack plane.Finally,experimental verification was carried out to verify the model validity and accuracy.Good performance was observed in comparison with experimental results.Moreover,it is shown that this model is closely related to various mesoscale parameters,such as HSF length,hooked end geometry,and matrix strength etc.,which obviously indicates the double functions of this model in both fracture energy prediction and the optimization design of HSFRCC.