单向短切纤维增强复合材料(UACS)层合板的开孔效应  

Effects of holes in unidirectional chopped fiber reinforced composites(UACS)laminates

作　　者：于苏东 张旭彤 王一帆 黄印远 张思祺 FELIX Thompson Eshun 胡军峰 YU Sudong;ZHANG Xutong;WANG Yifan;HUANG Yinyuan;ZHANG Siqi;FELIX Thompson Eshun;HU Junfeng(College of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211800,China)

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京211800

出　　处：《南京工业大学学报（自然科学版）》2024年第5期541-547,共7页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金青年基金(51808288)。

摘　　要：单向短切纤维增强复合材料(UACS)与传统短纤维增强聚合物复合材料(SFRP)相比,在保持优异纤维流动性的同时,表现出更高的强度,应用前景更加广泛。在实际应用过程中,通常需要对层合板进行开孔,因此,有必要研究层合板的许用应力与损伤容限。通过有限元方法(FEM)研究有孔与无孔UACS层合板的损伤模式以及抗拉强度。结果表明:无孔UACS层合板抗拉强度为520.67 MPa;与此相比,4、6、8、10 mm孔径的UACS层合板抗拉强度分别降低了13.6%、38.2%、50.6%、62.0%。UACS层合板损伤均开始于0°和±45°层之间,无孔层合板损伤开始于±45°层切口附近,开孔层合板损伤开始于±45°层孔周围的切口附近;无孔层合板的最终失效模式为纤维断裂,而开孔层合板的最终失效模式为分层断裂。模拟结果与试验结果基本吻合,验证了层合板模型的可靠性。Compared to traditional short fiber reinforced polymer composites(SFRP),unidirectional chopped fiber reinforced composites(UACS)exhibit higher strength while maintaining excellent fiber flowability,offering wider application prospects.In practical applications,laminates often need to be perforated,necessitating the determination of allowable stress and damage tolerance of these laminates.This study investigates the damage modes and tensile strength of both perforated and non-perforated UACS laminates using the finite element method(FEM).The results showed that the tensile strength of non-perforated laminates was 520.67 MPa.In comparison,the strengths of laminates with hole diameters of 4,6,8 and 10 mm decreased by 13.6%,38.2%,50.6%and 62.0%,respectively.Damage in UACS laminates started between 0°and±45°layers,with non-perforated laminates initiating damage near the±45°layer cut,while perforated laminates started damage near the cut around the hole in the±45°layer.The final failure mode of non-perforated laminates was fiber fracture,whereas the final failure mode of perforated laminates was delamination fracture.Comparison with the experimental results showed that the simulation results were in good agreement,verifying the reliability of the laminate model.

关 键 词：单向短切纤维增强复合材料层合板 开孔 拉伸 损伤扩展 尺寸效应 

分 类 号：TB332[一般工业技术—材料科学与工程]