芳纶纤维复合材料弯曲性能试验仿真

对叠层结构芳纶纤维织物增强复合材料的弯曲性能试验进行仿真,分析±45°纤维铺层对复合材料弯曲性能的影响.参照GB/T 3356-1999弯曲性能试验,生成了4种不同铺层结构小尺寸试样的几何模型,建立了三点弯曲试验的有限元模型,计算得到了试样的应力场结果,预测了试样的弯曲弹性模量及弯曲强度.结果表明:±45°芳纶纤维铺层将提高叠层结构的弯曲性能,为叠层结构的铺层优化设计提供了技术支持.     

三维浅交弯联复合材料结构与力学性能研究

以2400tex的玻璃纤维为原料,在SGA598型三维织机上,织制出三层和六层两种三维浅交弯联机织物作为三维机织复合材料预制体,将两块三层三维浅交弯联机织物层叠在一起以保持两种机织物的纬纱层数一致。将环氧树脂E51与聚醚胺WHR-H023以质量比为3∶1的比例混合后制成树脂基体,采用手糊成型的方式将预制体与树脂基体按照质量比为1∶1的比例复合成型,制备出两种三维浅交弯联机织复合材料。借助Instron 3385H型万能材料试验机对材料的拉伸及弯曲力学性能进行测试;通过实验过程及对破坏断面的观察比较两种复合材料的力学性能。实验结果表明,三维浅交弯联机织复合材料在承受拉伸及弯曲载荷时,主要表现为脆性破坏模式;六层三维浅交弯联机织物作为复合材料的预制体时,该复合材料的弯曲性能和拉伸性能均优于两块三层三维浅交弯联机织物层叠在一起作为增强体的复合材料;且六层机织物可以更好地保护复合材料,提高其使用寿命。     

PBO纤维和碳纤维混杂增强混凝土抗弯曲性能研究

采用PBO纤维与碳纤维混杂复合材料片材增强加固混凝土,设计了3种混杂比的复合材料片材对混凝土进行增强实验,采用3点抗弯曲试验测试纤维片材对混凝土抗弯曲性能增强效果。结果表明,掺有纤维片材的混凝土抗弯曲强度比素混凝土明显提高,两种纤维层间混杂增强后抗弯曲强度呈现出正的混杂效应,破坏形式由素混凝土的脆性断裂转变纤维混凝土的层间韧性断裂。     

环氧玻璃钢层间剪切断裂与断口分析

本文利用SEM-505扫描电子显微镜观察了高强玻璃纤维增强环氧S-GF/F-46复合材料的层间剪切破坏断口形貌,分析了该材料中界面、纤维铺层方向以及湿度对层间剪切性能的影响,并讨论了该材料层间剪切断裂的破坏机制。     

工程防护用轻质复合板的研制

讨论以芳纶纤维织物、超高分子量聚乙烯纤维织物、高强玻璃纤维织物为增强材料制成的不同材质的工程防护用轻质复合板的抗破片(模拟弹)性能。研制了质轻、阻燃、高强、安装使用方便、抗玻片性能良好并兼有防核辐射功能的复合板。     

高强聚乙烯复合材料层压板的防弹测试

为制备防弹性能较好的高强聚乙烯复合材料层压板,利用RTM模压成型工艺制备复合材料层压板.对层压板进行弹道损伤测试分析,设计不同铺设角度进行贯穿试验,以及使用高强聚乙烯UD布、平纹织物以及正交三向织物进行背凸试验.试验结果表明,在0°/90°的铺层角度,使用平纹织物作为背部材料时,复合材料层压板具有较好的防弹性能.     

不同增强方式下泡沫夹芯复合材料三点弯曲性能研究

研究了缝合及加强筋增强方式下泡沫夹芯复合材料的三点弯曲性能.采用万能试验机分别进行了缝合与未缝合碳纤维、玻璃纤维、玻碳混杂纤维泡沫夹芯复合材料的三点弯曲实验,分别得出各自的载荷-挠度曲线,再引入加强筋的方式进一步研究缝合碳纤维泡沫夹芯复合材料的弯曲性能.结果表明,玻碳混杂纤维泡沫夹芯复合材料较玻璃纤维泡沫夹心复合材料性...     

三维正交机织铜丝／玻璃纤维层间混杂复合材料的拉伸和弯曲性能研究

本文设计和制作了两种层间混杂结构的三维正交机织铜丝／玻璃纤维复合材料,分别为铜丝单面混杂和双面混杂复合材料。两种复合材料的拉伸性能和弯曲性能测试结果表明,单面铜丝／玻璃纤维混杂复合材料的归一化拉伸强度和模量分别为1214MPa和83GPa;高于双面铜丝／玻纤混杂复合材料44％和51％。单面铜丝／玻璃纤维混杂复合材料的归一化弯曲强度为964NPa,高于双面铜丝／玻纤复合材料27％。两者的弯曲模量比较接近,均为60GPa左右。由于铜丝的混杂效应,三维正交机织铜丝／玻璃纤维层间混杂复合材料的拉伸和弯曲性能与相同结构的玻璃纤维复合材料相比有一定的下降。     

PBO/T700层间混杂复合材料弯曲及压缩性能研究

研究了PBO纤维与T700碳纤维层间混杂复合材料的弯曲性能和压缩性能。利用材料万能试验机研究了混杂复合材料的弯曲强度和弯曲模量、压缩强度和压缩模量随混杂比的变化情况,同时对混杂复合材料的弯曲破坏和压缩破坏模式进行了研究。研究结果表明,混杂工艺能够使PBO纤维复合材料的弯曲强度从542MPa增大到1120MPa,压缩强度从233.2MPa增大到702MPa;PBO纤维复合材料和T700碳纤维复合材料弯曲和压缩试样的破坏模式分别表现为典型的韧性破坏和脆性破坏,PBO/T700层间混杂复合材料的弯曲和压缩破坏模式随着混杂比增大,逐渐从韧性破坏转变为脆性破坏。     

亚麻增强热塑性树脂复合材料板材的研究与应用

以亚麻纤维为增强体,与聚丙烯(PP)纤维按一定比例进行混合,然后制备加捻纱及PP长丝包覆的包覆纱,并利用机织工艺织成二维机织布作为复合材料的预制铺层.采用层合热压方法制备PP/亚麻纤维复合材料板材.通过对板材弯曲性能的测试及分析,研究了制备工艺、纱线结构及亚麻纤维含量等因素对复合材料弯曲性能的影响.     

UHMWPE纤维针织物-环氧树脂复合材料的制备与性能

将等离子体处理前后的超高相对分子质量聚乙烯(UHMWPE)纤维针织物分别与环氧树脂在平板硫化机上进行复合,制作出UHMWPE纤维针织物复合材料,对其进行裁样,测试UHMWPE纤维针织物复合材料的拉伸、弯曲和压缩性能。结果表明:经等离子体处理后,复合材料的拉伸强度、弯曲强度均有较大提高,压缩强度有小幅增加。     

芳纶针织物复合材料力学性能研究

为探究芳纶针织物复合材料的力学性能,用电子织物强力机对平板硫化机制得的芳纶针织物复合材料进行拉伸、弯曲、压缩性能测试,结果表明:芳纶针织物增强复合材料为非脆性破坏;经硅烷偶联剂处理有效地提高了芳纶针织物增强复合材料的抗拉、抗弯、抗压强度;罗纹空气层组织的抗拉、抗弯及抗压性能优于满针罗纹组织。     

Bending properties of the multilayer‐connected biaxial weft knitted fabrics‐reinforced composites made with carbon fibers

This article presents an experimental study of bending properties of multilayer‐connected biaxial weft knitted (MBWK) fabrics‐reinforced composites made with carbon fibers. Three types of composites are used in bending test, which are three‐layer‐connected biaxial weft knitted fabric‐reinforced composite, four‐layer‐connected biaxial weft knitted fabric‐reinforced composite and five‐layer‐connected biaxial weft knitted fabric‐reinforced composite. Two‐way ANOVA analyzing method was used to deal with whether the carbon fiber volume fraction and the cutting direction have significant effect on the bending strength of the MBWK fabrics‐reinforced composites. Failure analysis is also available by means of samples debris examination to identify the failure mode. POLYM. COMPOS., 36:2291–2302, 2015. © 2014 Society of Plastics Engineers     

Structural degradation and mechanical fracture of hybrid fabric reinforced composites

This investigation involves the study of accelerated environmental aging in two polymer composite laminates reinforced by hybrid fabrics based on carbon, Kevlar and glass fibers. Composite laminate configurations are defined as a laminate reinforced with E‐glass fiber and Kevlar 49 fiber hybrid fabric (GK) and another laminate reinforced with E‐glass fiber and AS4 carbon fiber hybrid fabric (GC). Both laminates were impregnated with epoxy vinyl ester thermosetting resin (Derakane 470‐300) consisting of four layers. Morphological studies (photo‐oxidation process and structural degradation) of environmental aging were conducted, in addition to comparative studies of the mechanical properties and fracture characteristics under the action of uniaxial tensile and three‐point bending tests in specimens in the original and aged conditions. With respect to uniaxial tensile tests for both laminates, good mechanical performance and little final damage (small loss of properties) was caused by the aging effect. However, for the three‐point bending tests, for both laminates, the influence of aging was slightly higher for all parameters studied. The low structural deterioration in the laminates is attributed to the high performance with the heat of the matrix (Derakane 470‐300) and the characteristics of the hybrid fabric, exhibiting fiber/matrix interface quality. POLYM. ENG. SCI., 56:657–668, 2016. © 2016 Society of Plastics Engineers     

高低温老化对碳纤维复合材料芯棒结构性能的影响

采用拉挤工艺制备了碳纤维增强环氧树脂基复合材料芯棒,并对其进行高低温人工加速老化试验,以及对老化前后碳纤维复合材料芯棒的横截面、外观颜色和密度进行了测试和分析。结果表明,高低温老化使芯棒颜色加深,主要对芯棒的外层产生一定的影响,内部结构没有明显变化;老化后芯棒的密度比老化前减小约2.5%,并且不同老化周期对芯棒的密度基本不变。     

Comparison of mechanical properties of epoxy composites reinforced with stitched glass and carbon fabrics: Characterization of mechanical anisotropy in composites and investigation on the interaction between fiber and epoxy matrix

The primary purpose of the study is to evaluate and compare the mechanical properties of epoxy‐based composites having different fiber reinforcements. Glass and carbon fiber composite laminates were manufactured by vacuum infusion of epoxy resin into two commonly used noncrimp stitched fabric (NCF) types: unidirectional and biaxial fabrics. The effects of geometric variables on composite structural integrity and strength were illustrated. Hence, tensile and three‐point bending flexural tests were conducted up to failure on specimens strengthened with different layouts of fibrous plies in NCF. In this article, an important practical problem in fibrous composites, interlaminar shear strength as measured in short beam shear test, is discussed. The fabric composites were tested in three directions: at 0°, 45°, and 90°. In addition to the extensive efforts in elucidating the variation in the mechanical properties of noncrimp glass and carbon fabric reinforced laminates, the work presented here focuses, also, on the type of interactions that are established between fiber and epoxy matrix. The experiments, in conjunction with scanning electron photomicrographs of fractured surfaces of composites, were interpreted in an attempt to explain the failure mechanisms in the composite laminates broken in tension. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers     

玻璃短纤维对多层多轴向经编复合材料层间撕裂性能影响

以玻璃纤维多轴向经编针织物为增强体,以环氧树脂为基体,将玻璃短纤维添加到玻纤织物增强体层之间,制备层间含有玻璃短纤维的多层多轴向经编复合材料。利用万能力学材料试验机对复合材料的层间撕裂性能进行测试和电镜扫描,对撕裂后的复合材料层间形态进行了观察,研究了玻璃短纤维对复合材料层间性能的影响。结果表明,玻璃短纤维增韧处理的复合材料层间撕裂性能明显增强,载荷-位移曲线初始斜率大,复合材料不易被以撕裂形式为主的载荷破坏。     

碳纤维布/玻纤布增强聚氨酯复合材料的研究

以聚氨酯为基体树脂,分别以碳纤维布、玻璃纤维布和这两种纤维布交替铺叠作为增强材料,采用真空辅助灌注成型工艺制备了4种复合材料.考察了纤维布的铺层结构对复合材料的弯曲、拉伸和冲击性能的影响.结果显示,复合材料的拉伸模量和弯曲模量随碳纤维含量增加而增加,冲击强度则降低.分别采用TGA、DMA和SEM对复合材料的热性能、界面...     

新型假捻变形纱针织物的仿棉性能评价

就新型假捻变形纱针织物的光泽、基本力学性能、悬垂性和热湿舒适性进行了较为全面的研究,并通过与棉织物进行对比分析,对新型假捻变形纱织物的仿棉效果作出了评价.试验结果表明:新型假捻变形纱织物与棉织物相比,正反射光强和漫反射光强较大,对比光泽度较大,具有较高的光泽度值;从基本力学性能测试结果上看,新型假捻变形纱织物的弯曲刚度、弯曲滞后量、剪切刚度、剪切滞后量、压缩比功小于棉织物,而其压缩功回复率大于棉织物,说明新型假捻变形纱织物的柔软性、成形性和弹性回复能力较棉织物好,但蓬松性不及棉织物;新型假捻变形纱织物的保暖性和透湿性能低于棉织物,透气导湿性能好于棉织物,两种织物的接触冷暖感相近.