嵌锁式碳纤维/树脂基复合材料方形蜂窝夹芯结构的力学性能及损伤失效  

Mechanical properties and damage failure of carbon fiber reinforced polymer composite sandwich structure with square honeycomb core using the interlocking method

作　　者：王志鹏 李剑峰 李海波[2] 韦冰峰[2] 秦庆华[1,2,3] WANG Zhipeng;LI Jianfeng;LI Haibo;WEI Bingfeng;QIN Qinghua(State Key Laboratory for Strength and Vibration of Mechanical Structures,School of Aerospace,Xi'an Jiaotong University,Xi′an 710049,China;Science and Technology on Reliability and Environment Engineering Laboratory,Beijing Institute of Structure and Environment Engineering,Beijing 100076,China;Key Laboratory of Impact and Safety Engineering,Ministry of Education,Ningbo University,Ningbo 315211,China)

机构地区：[1]西安交通大学航天航空学院,机械结构强度与振动国家重点实验室,西安710049 [2]北京强度环境研究所可靠性与环境工程技术重点实验室,北京100076 [3]冲击与安全工程教育部重点实验室(宁波大学),宁波315211

出　　处：《复合材料学报》2022年第4期1778-1789,共12页Acta Materiae Compositae Sinica

基　　金：航天一院高校联合创新基金(CALT201708);国家自然科学基金(11972281);陕西省自然科学基金(2020JM-034);冲击与安全工程教育重点实验室(宁波大学)开放课题(CJ202003)。

摘　　要：设计并采用嵌锁组装工艺制备了碳纤维/树脂基复合材料方形蜂窝夹芯结构,开展了面外平压性能和三点弯曲性能试验研究,获得了夹芯结构在平压载荷作用下的破坏模式,分析了其损伤失效机制及吸能特性,讨论了在三点弯曲载荷作用下面板质量非对称性和槽口方向对夹芯梁的破坏模式及承载能力的影响。研究结果表明嵌锁式碳纤维/树脂基复合材料方形蜂窝夹芯结构在准静态压缩载荷下表现为从槽口附近纤维断裂到开槽侧肋板失稳断裂,再到未开槽侧肋板断裂和压溃的渐进式损伤破坏模式;压缩应力-应变曲线出现明显的二次应力平台,体现出夹芯结构优异的吸能特性;配置较厚的上面板及芯材长肋板槽口向上时,结构的承载能力和初始失效载荷更高。Composite sandwich structure with carbon fiber reinforced polymer(CFRP)square honeycomb core was designed and fabricated using the interlocking method.The out-of-plane compressive performance and the threepoint bending performance of the sandwich structure were studied experimentally.The failure modes of the sandwich structure under out-of-plane compressive loading were obtained and the failure mechanism and energy absorption characteristics were analyzed.The influences of the asymmetry of the face sheet quality and the direction of the slots on the failure modes and bending strength of the sandwich beam under three-point bending loading were explored,respectively.The experimental results show that the sandwich structure under out-of-plane compressive loading exhibits the progressive failure mode:fiber fracture near the slots,bucking and fracture of the slotted part of ribs,and the fracture and crushing of the unslotted part of ribs.The compressive stress-strain curve has obvious two-stage plateau stress,which means the excellent energy absorption characteristics of the sandwich structure.The sandwich structure has the higher load-carrying capacity and initial failure loading for the thicker upper face sheet and the upward slots of the long ribs of the core.

关 键 词：碳纤维/树脂基复合材料 方形蜂窝 嵌锁组装工艺 夹芯结构 平压 三点弯曲 

分 类 号：TB332[一般工业技术—材料科学与工程]