共查询到19条相似文献,搜索用时 62 毫秒
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本文采用冲击后压缩强度试验对多轴向经编/缝合复合材料的损伤容限进行了研究。结果表明:与层合板复合材料相比,多轴向经编/缝合复合材料的冲击后压缩强度提高了100%以上,说明缝合对提高材料的抗损伤容限有较大的贡献。最后探讨了多轴向经编/缝合复合材料具有优越的综合性能及广阔的应用前景。 相似文献
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杨龙英 《玻璃钢/复合材料》2018,(6):99-103
缝合技术作为整体成型的制造技术,能有效增强复合材料的层间强度和抗冲击损伤性能。在缝合技术中有不同的缝合方式,目前常用的缝合方式有锁式缝合、链式缝合和临缝三种。不同的缝合方式对复合材料的层间剪切性能、压缩性能、拉伸性能和弯曲性能会产生不同的影响。主要研究了在三种不同的缝合方式下,复合材料的压缩性能、拉伸性能和弯曲性能的变化。 相似文献
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研究了不同缝合间距和不同碳布对碳/碳缝合复合材料力学性能的影响.结果 表明:在相同缝合间距下,缝合预制体的单元层厚度越薄,其碳/碳复合材料的综合性能越优异,且相比单元层性能,单元层厚度对其碳/碳复合材料的性能影响更显著;随着缝合间距变小,碳/碳复合材料拉伸强度整体呈现下降趋势,且降低幅度均增大,弯曲强度和层间强度呈现增加趋势,且增加幅度均增大. 相似文献
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纤维表面处理对复合材料力学性能的影响 总被引:5,自引:0,他引:5
本文研究了碳纤维表面处理方法对纤维-基体界面剪切强度的影响.研究结果表明,相对于未进行表面处詈的碳纤维-所采用的胺基化处理和偶联剂处理两种表面处理方法都能够提高碳纤维界面的剪切强度,从而提高复合材料整体的抗拉强度和弹性模量。并且偶联剂处理方法具有更好的工艺性. 相似文献
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亚麻纤维通过针刺工艺加工成非织造布,再经缝合加固后,作为复合材料的增强体,与不饱和聚酯树脂复合,制成亚麻/不饱和聚酯复合材料板材及异型件。利用真空辅助树脂传递模塑法制备出的板材,亚麻纤维和树脂结合较为均匀、充分。模压法形成的亚麻非织造布异型件成型良好,无褶皱与破洞。对板材及异型件拉伸、弯曲及压缩等性能的测试结果表明,板材拉伸强度最大值达58.59MPa,弯曲强度最大值为120.26MPa;采用平行缝合工艺的异型件最大破坏载荷为8.99kN。 相似文献
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Theory of Mechanical Properties of Ceramic-Matrix Composites 总被引:6,自引:0,他引:6
William A. Curtin 《Journal of the American Ceramic Society》1991,74(11):2837-2845
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A theoretical framework is developed for the notched strength of ceramic composites that exhibit rising fracture resistance. It is based on established concepts of crack stability under stress-controlled loadings. On using a linear representation of the resistance curve (expressed in terms of an energy release rate), straightforward analytical solutions are obtained for the strength as well the amount of stable crack growth preceding fracture and the associated fracture resistance. Calculations are performed for several test configurations commonly used for material characterization, including single- and double-edge-notched tension, center-notched tension, and single-edge-notched bending. The results reveal salient trends in strength with notch length and specimen geometry. An assessment of the theory is made through comparison with experimental measurements on an all-oxide fiber composite. Transitions in the degree of notch sensitivity with notch length are identified and explored. The utility of the theoretical results both for rationalizing the trends in measured notched strength and for guiding experimental studies of notch sensitivity is demonstrated. 相似文献
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综合考虑碳纤维材料的加工适应性以及对基体力学性能改善的能力,分别选取了短切碳纤维和碳纤维粉末作为增强相,比较了它们对于PP的增强效果以及加工的难易,通过测定拉伸性能和冲击韧性考察了短切碳纤维的含量以及碳纤维粉末的含量对各自复合材料力学性能的影响。结果表明,随着碳纤维含量的增加,两种复合材料的冲击韧性以及拉伸性能都呈先增加后减小的趋势,短切碳纤维作为增强相对于基体树脂的力学性能增强效果更为显著,碳纤维粉末作为增强相的复合材料加工适应性强,性能更加稳定,该研究对碳纤维制品的实际注塑生产具有十分重要的意义。 相似文献
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本文选用微波烧结新工艺,对ZTA陶瓷力学性能进行了研究,获得了较传统烧结工艺优良的陶瓷抗奇强度和断裂韧性。新工艺可以显著降低ZTA陶瓷的致密化温度,同时改善其显微结构。 相似文献
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Enhanced Mechanical Properties of Alumina by Dispersed Titanium Diboride Particulate Inclusions 总被引:1,自引:0,他引:1
The mechanical properties of composite ceramics composed of 0 to 20 vol% of titanium diboride particles dispersed in an α-alumina matrix were investigated. The alumina–titanium diboride composite powder was hot-pressed at 1470°C for 20 min to achieve over 98.8% of the theoretical composite density. The strength and fracture toughness of the twophase, hot-pressed composite were both significantly improved compared to the single-phase alumina. Results from different methods of measuring the stress intensity factor, ( K I c ) are compared and discussed. 相似文献
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Composites containing 30 vol%β-Si3 N4 whiskers in a Si3 N4 matrix were fabricated by hot-pressing. The composites exhibited fracture toughness values between 7.6 and 8.6 MPa · m1/2 , compared to 4.0 MPa · m1/2 for unreinforced polycrystalline Si3 N4 . The improvements in fracture toughness were attributed to crack wake effects, i.e., whisker bridging and pullout mechanisms. 相似文献
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《国际聚合物材料杂志》2012,61(9):911-927
Epoxy resin has been chemically modified using 4, 8, and 12% of bisphenol-A based polysulphone along with three types of bismaleimides, namely [N, N′-bismaleimido-4,4′-diphenylmethane (BMI-1), 1,3-bis (maleimido) benzene (BMI-2) and 1,1′-bis (4-maleimidophenyl) cyclohexane (BMI-3)]. The epoxy hybrid matrices developed, in the form of castings, were used to characterize their mechanical properties like tensile strength, tensile modulus, flexural strength, flexural modulus, impact strength, hardness, and dynamic mechanical analysis as per ASTM standards. Data obtained from mechanical studies indicate that the introduction of hydroxyl terminated polysulfone into epoxy resin enhanced the value of impact strength to the extent of 48% due to the formation of flexible graft structures. Similarly, the incorporation of bismaleimides into epoxy resin also improved both tensile and flexural behavior of epoxy resin. Further, the introduction of combination of both polysulfone and bismaleimides into epoxy resin improved the mechanical properties according to their percentage content. Among the bismaleimides-modified polysulfone epoxy matrices, the epoxy matrix modified with 8% polysulfone and 8% BMI-2 exhibited better mechanical properties than other modified epoxy matrices. 相似文献
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A series of 0, 10, and 25 vol% metal-particulate/glass-matrix composites were prepared, with the composite volume fraction both constant and graded across the specimen bulk. Applied-moment double-cantilever-beam (AMDCB) fracture toughness results show, in general, that the graded composites had equivalent values when compared with the constant fraction specimens. This equivalence in toughness occurred despite lower overall volume fraction particulate phase and composite density for the graded composites. Additionally, these results indicate the necessity of a minimum composite layer thicknes for optimization of toughening. 相似文献