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《塑料工业》2019,(10)
采用T700/6240碳纤维/环氧树脂预浸料和自制热塑性酚酞基聚醚酮(PEK-C)增韧膜,通过热压成型工艺制备不同层间增韧结构复合材料层合板,对其进行低速冲击、冲击后压缩及三点弯曲实验,并结合扫描电子显微镜(SEM)微观形貌表征及数学优化思想,确定最佳增韧结构。结果表明,在不同位置铺设12层增韧膜的四组试样中,中部增韧效果最佳,其冲击后压缩强度(CAI)比未增韧时提高42.39%。在层合板中部铺设8、16和23层增韧膜的试样,CAI和弯曲强度随增韧膜数量的增加分别呈现递增和递减趋势。通过弯曲试样SEM形貌表征发现,随增韧膜数量的增加,裂纹纵向扩展受到抑制,且由于环氧树脂与PEK-C的相容性较差,出现局部分层损伤。结合总增益和单层增益函数变化趋势,确定最佳增韧结构为层合板中部铺设11或12层增韧膜。 相似文献
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采用低熔体粘度适用于液态成型的聚酰亚胺树脂研究了树脂传递模塑(RTM)工艺中树脂注射压力、注射流速、固化温度对碳纤维增强聚酰亚胺复合材料性能的影响,以确定最佳的成型工艺参数。结果表明,随着注射压力增大,复合材料的玻璃化转变温度下降,层间剪切强度提高,弯曲强度略有提升。随着注射流速增加,复合材料玻璃化转变温度不变,层间剪切强度和弯曲强度降低。随着固化温度升高,复合材料的玻璃化转变温度升高,但固化温度达到400℃时,层间剪切强度和弯曲强度明显降低。根据树脂工艺性,综合考虑复合材料内部质量、耐热性和力学性能,采用注射压力1.2 MPa,注射流速15 mL/min以及固化温度380℃的成型工艺较优。 相似文献
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本文对PEK-C/连续碳纤维复合材料的层间剪切强度、冲击强度、弯曲强度与树脂含量的关系进行了研究,观察到了该复合材料的冲击破坏形貌具有“葫芦串”特征,并讨论了它对冲击强度的影响。 相似文献
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采用不同浓度的酚酞型聚芳醚酮(PEK-C)溶液对碳纤维(CF)进行表面处理,并制备了碳纤维增强聚苯硫醚(PPS/CF)复合材料。结果表明:与去浆后CF(CF-A)相比,浓度0.50%的PEK-C溶液处理的CF表面O/C比提升约49.2%,且C—O键和C=O键占比明显提升。说明PEK-C溶液处理可以有效增加CF表面含氧官能团的数量,且在该条件下复合材料的界面性能和弯曲性能大幅提升,相较于未经PEK-C改性的PPS/CF复合材料,0.50%的PEK-C溶液改性后的PPS/CF复合材料层间剪切强度由23.81 MPa提高至38.45 MPa,弯曲强度由709 MPa提高至839 MPa。 相似文献
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采用单层预浸料搭接简化构型,研究电热载荷对复合材料层板挖补修理搭接接头层间剪切性能的影响。通过自制的复合材料电热测试平台,测试了不同电流制度下,随搭接长度不同试样接头处温度分布。研究了不同电流强度下搭接接头温度变化规律,初步揭示了搭接接头长度-温度-电阻之间的关系,并对不同电流载荷下挖补搭接接头的层间剪切性能进行研究。研究结果表明,通电过程中,搭接区域温度升高较快,非搭接区域温度无明显变化。低电流时,电热促使接头树脂进一步固化,适当提高了接头搭接界面的粘接性能,其剪切强度略有上升;当通电电流过大时,接头温度急剧上升,对搭接区域产生过热损伤,降低了接头的剪切强度。 相似文献
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《玻璃钢/复合材料》2021,(5)
本体增韧和"离位"增韧是提高复合材料韧性的主要增韧技术,在RTM复合材料中也有大量应用。本文分别对EH301树脂进行本体增韧和"离位"增韧设计,并对改性前后树脂及其复合材料的流变特性、耐热性、冲击后压缩强度和其他力学性能进行分析,对比两种增韧技术在RTM复合材料中应用的优缺点。同时,结合扫描电子显微镜(SEM)观察PA毡的定型状态,研究定型工艺对复合材料力学性能的改善效果。结果表明:相比于本体增韧,"离位"增韧技术工艺性好,增韧效果显著,更适用于RTM复合材料体系的增韧,缺点是会降低复合材料的压缩强度和层间剪切强度。通过提高定型工艺时间和温度,改善PA毡与树脂的界面结合力,能够降低这种负面影响。 相似文献
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采用双槽口剪切法(double-notched shear,DNS)研究了二维(two dimensional,2D)碳纤维增强碳化硼-碳化硅[2DC/(BCx-SiC)n]复合材料的高温层间剪切性能,用扫描电子显微镜观察断口形貌。结果表明:在25~1200℃范围内,温度对2DC/(BCx-SiC)n复合材料的层间剪切强度有明显影响,在900℃时材料的层间剪切强度最高可达40.0MPa,分别比25℃和1200℃的高约13%和8%,略高于700℃的。此外,C/(BCx-SiC)n的层间剪切强度始终高于C/SiC的强度,且2种材料的层间剪切强度随温度变化规律相似。断口分析表明:层间剪切失效发生在基体内部或基体/纤维界面上,而纤维并没有受到损伤。 相似文献
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采用双槽口剪切法(double-notchcd shear,DNS)研究了二维(twodimensional,2D)碳乡纤维增强碳化硼-碳化硅[2DC/(BCx-SiC)]复合材料的高温层间剪切性能,用扫描电子显微镜观察断口彤貌.结果表明:在25~1200℃范围内.温度对2DC/(BCx-SiC)n复合材料的层间剪切强度有明显影响,在900℃时材料的层间剪切强度最高可达40.0MPa,分别比25℃和1200℃的商约13%和8%,略高于700℃的.此外,C/(BCx-SiC)n的层间剪切强度始终高于C/SiC的强度,且2种材料的层间剪切强度随温度变化规律相似.断口分析表明:层间剪切失效发生在基体内部或基体/纤维界面上,而纤维并没有受到损伤. 相似文献
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本文讨论了温度,降水量和相对湿度三种气候因素对T300/4211单向碳纤维复合材料层间剪切强度和弯曲性能保持率的影响,指出相对湿度对T300/4211碳纤维复合材料层间剪切强度有影响,温度和降水量则对复合材料层间剪切强度和弯曲性能保持率的影响不明显。 相似文献
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通过开展温度对涂黑叶片复合材料性能的影响研究,指导对涂黑风电叶片服役寿命的预测。试验结果表明,涂黑叶片日照升高的极限温度为60℃,60℃温度作用3 h后,蒙皮层合板的拉伸和压缩性能均不同程度的退化,拉伸强度和压缩强度分别下降了28.9%、44.5%,但层合板的V形剪切强度下降率相对较低,为6.1%;梁帽用拉挤板的V形剪切强度下降率较高,达16.3%,拉挤板的拉伸强度和压缩强度分别下降了3.3%、6.3%;壳体用PVC60泡沫和Balsa轻木夹芯复合材料的剪切强度分别下降31%、4.2%。 相似文献
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纳米改性碳/酚醛树脂基复合材料性能研究 总被引:1,自引:0,他引:1
针对碳/酚醛树脂基复合材料层间剪切强度低的缺点,采用纳米填料进行改性。测试了2种纳米填料(纳米碳纤维、碳纳米管)改性后酚醛树脂的热解性能,研究了纳米填料对复合材料力学性能、烧蚀性能以及高温炭化后力学性能的影响,并观察分析了复合材料测试后的微观形貌。研究结果表明,纳米填料改性后,复合材料的力学性能、烧蚀性能均有所改善。其中,纳米碳纤维改性后复合材料的常温层间剪切强度达到24.9 MPa,氧乙炔线烧蚀率为22.75μm/s,质量烧蚀率为23.58 mg/s。纳米碳纤维表面粗糙,与树脂基体的界面强度高,因此其改性后的力学性能和烧蚀性能优于碳纳米管。 相似文献
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The mechanical properties (flexural modulus, static tensile strength, notched Izod impact strength), miscibility, thermal stability, and flame retardance of a poly(ethylene oxide) (PEO)-toughened phenolic resin glass pultruded composite were investigated. The mechanical properties of a pultruded glass fiber-reinforced modified phenolic resin composite increased while the soft segment of PEO absorbs the loads in the network of brittle phenolic resin. The phenolic/PEO blend is completely miscible, from the results of differential scanning calorimetry. Its thermal degradation temperature is always higher than 370°C and decreased with increasing PEO content. The morphology of the interface between the fiber and matrix is well wetted-out with increasing PEO content from the result with a scanning electron microscope (SEM). The modified phenolic composite also shows excellent flame retardance that is UL-94, V-0, and the limited oxygen index is more than 55. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 1129–1136, 1998 相似文献
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In this work, quasi‐carbon fabrics were produced by quasi‐carbonization processes conducted at and below 1200°C. Stabilized polyacrylonitrile (PAN) fabrics and quasi‐carbon fabrics were used as reinforcements of phenolic composites with a 50 wt %/50 wt % ratio of the fabric to the phenolic resin. The effect of the quasi‐carbonization process on the flexural properties, interfacial strength, and dynamic mechanical properties of quasi‐carbon/phenolic composites was investigated in terms of the flexural strength and modulus, interlaminar shear strength, and storage modulus. The results were also compared with those of a stabilized PAN fabric/phenolic composite. The flexural, interlaminar, and dynamic mechanical results were quite consistent with one another. On the basis of all the results, the quasi‐static and dynamic mechanical properties of quasi‐carbon/phenolic composites increased with the applied external tension and heat‐treatment temperature increasing and with the heating rate decreasing for the quasi‐carbonization process. This study shows that control of the processing parameters strongly influences not only the mechanical properties of quasi‐carbon/phenolic composites but also the interlaminar shear strength between the fibers and the matrix resin. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
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《Journal of Adhesion Science and Technology》2013,27(12):1473-1483
The internal reinforcement of Douglas-fir by glass or basalt fibers impregnated with resorcinol-phenol-formaldehyde or polymeric diphenylmethanediisocyanate bonding resins has been investigated. The objective was to evaluate the improvement in composite properties by the use of silane coupling agents. Fibers were treated with 3-(4-methoxyphenyl) propyl methyldichlorosilane for use with the phenolic resin, and with 3-aminopropyl triethoxysilane for use with the isocyanate resin. Resin impregnated fiber plies were sandwiched between wood pieces to prepare test specimens with 17 vol. % fiber for measurement of block shear strength, and modulus of rupture (MOR) and modulus of elasticity (MOE) in 3-point bending, and interlaminar shear strength in 5-point bending. The durability under wet conditions was evaluated by subjecting the specimens to an accelerated exposure test (ASTM D2559). It was found that silane application resulted in slight shear strength improvement under dry conditions but much higher increase in shear strength retention after exposure to moisture. Basalt fibers and E-glass fibers gave similar results and comparable properties. 相似文献
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有机蒙脱土改性环氧树脂结构胶粘剂的性能研究 总被引:3,自引:1,他引:3
利用经十八季铵盐改性有机蒙脱土与环氧树脂结构胶粘剂进行插层复合,在不同掺量、不同的固化条件下测试了插层法制备的有机蒙脱土-环氧树脂胶粘剂的钢-钢剪切强度、浇铸体压缩强度、流变性能及适用期。实验表明,中温固化是进行插层复合的关键条件,胶粘剂的性能有较大提高;当蒙脱土质量分数为10%时,其钢-钢剪切强度、浇铸体压缩强度分别提高65.3%和10%;随着蒙脱土含量的增加,胶粘剂的流变性能从牛顿液体向触变性流体转变。 相似文献