穿孔泡沫夹层复合材料低速冲击性能试验研究  

Experimental Investigation on Low-Velocity Impact Behavior of Perforated Foam Core Sandwich Composites

作　　者：季秋足 崔为运 蔡登安[1] 周光明[1] JI Qiuzu;CUI Weiyun;CAI Deng’an;ZHOU Guangming(State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016

出　　处：《南京航空航天大学学报》2023年第1期35-43,共9页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家自然科学基金(52005256);江苏省基础研究计划自然科学基金(BK20190394);江苏省博士后科研资助计划项目(2020Z437);机械结构力学及控制国家重点实验室开放课题(MCMS-E-0220Y02);江苏高校优势学科建设工程资助项目(PAPD)。

摘　　要：针对普通泡沫夹层复合材料层间性能较弱的问题,提出在泡沫上预先打孔的方法,在泡沫芯材中形成胶钉从而提高泡沫夹层材料的力学性能,并对穿孔泡沫夹层复合材料的低速冲击性能进行了研究。通过手糊和真空辅助成形工艺制备穿孔泡沫夹层复合材料试验件,对其进行不同能量的低速冲击试验,记录接触力、冲头位移和能量吸收率等力学响应,并采用目视检测和超声C扫无损检测两种方法确定冲击损伤的范围,探究胶钉密度、打孔深度和泡沫槽宽等变量对穿孔泡沫夹层复合材料低速冲击阻抗性能的影响。试验结果表明,随着冲击能量的增加,最大接触力、最大冲头位移和残余变形均增加,凹坑深度和内部损伤面积也增大,同时结构的能量吸收率也有所提高;适当地增加胶钉密度和泡沫槽宽能提高穿孔泡沫夹层材料的低速冲击阻抗性能,而泡沫孔深度对其冲击性能的影响较小。A method of pre-piecing the foam to form resin glue nails in the foam core is proposed to address the disadvantage of poor interlayer behavior of plain foam core sandwich composites, and low-velocity impact behavior of perforated foam core sandwich composites is investigated. Perforated foam core sandwich testing pieces are made by hand-pasting and vacuum assisted manufacturing process, and low-velocity impact tests with different energies are performed on these pieces to obtain the mechanic responses, such as contact forces, crosshead displacements, and energy absorbing ratios. The extension of low-velocity impact damages are determined by methods of visually inspection and nondestructive inspection with ultrasonic C-scan. It is known from the testing results that the maximum contact forces, the maximum impactor displacements, and residual deformation increase with the increasing of impact energy, indentation and internal damage area also increase, while energy absorbing ratio of the structure is promoted as well. Low-velocity impact resistance of perforated foam core sandwich composites can be improved by enhancing nail densities and foam groove widths moderately, while hole depth has little effects on its impact performances.

关 键 词：泡沫夹层复合材料 真空辅助成形 低速冲击试验 能量吸收率 无损检测 

分 类 号：TB332[一般工业技术—材料科学与工程]