工艺与制造英文2025被引 3
3D打印连续纤维增强聚合物钢筋的力学性能
Mechanical properties of 3D-printed continuous fiber-reinforced polymer reinforcing bars
Zi-Tong Yan, Junjie Zeng, Xianwen Hu, Yuanyuan Jiang, Jie-Kai Zhou, Yan Zhuge · Guangdong University of Technology
摘要整理
传统的纤维增强聚合物(FRP)钢筋拉挤成型工艺存在劳动力需求高、模具依赖性强、材料浪费严重和使用寿命终期环境问题等缺陷。本研究开发了基于热塑性环氧树脂和增材制造技术的3D打印连续纤维增强聚合物(3DP-CFRP)钢筋。进行了包括拉伸、横向剪切和层间剪切强度测试在内的系统实验研究。探索的参数包括钢筋直径3 mm、4 mm和5 mm,纤维体积含量分别为22.6%、27.6%和32.6%。测试结果表明,纤维体积含量为32.6%的3DP-CFRP钢筋拉伸强度超过800 MPa,弹性模量高于70 GPa。横向剪切测试结果显示剪切强度与拉伸强度的比值约为1:6。采用扫描电子显微镜(SEM)和X射线计算机断层扫描(CT)表征了3DP-CFRP钢筋的微观结构。CT分析表明,增加钢筋直径和提高纤维含量均会导致孔隙率增加,进而降低拉伸强度和层间剪切强度。基于孔隙率特征,建立了钢筋直径与拉伸强度、纤维含量与层间剪切强度的相关关系。研究结果为3DP-CFRP钢筋的力学性能和微观结构提供了重要认识,支持其在数字化、可回收和高性能建筑应用中的潜在应用前景。
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