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真空辅助成型技术(二) 总被引:11,自引:1,他引:11
真空辅助成型技术(VARI-Vacuum Assisted Resin Infusion)在低成本复合材料(FRP)成型工艺中起着很重要的作用,本文将介绍它的特点,制造,性能以及在国内外应用情况。 相似文献
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真空辅助成型技术(三) 总被引:5,自引:0,他引:5
真空辅助成型技术(VARI-Vacuum Assisted Resin Infusion)在低成本复合材料(FRP)成型工艺中起着很重要的作用,本文将介绍它的特点,制造,性能以及在国内外应用 情况。 相似文献
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FRP真空辅助成型工艺实验研究 总被引:3,自引:1,他引:2
通过真空辅助成型工艺实验(VARTM),对树脂粘度和凝胶时间随温度的变化规律进行了研究,并对影响玻璃钢制件机械性能的主要工艺参数进行了测试.结果表明,真空度大小和充模时间对制件机械性能有显著影响,真空度越大机械性能越好.充模时间长不利于机械性能的提高;在实验范围内,温度的影响不明显. 相似文献
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真空辅助RTM成型技术的研究 总被引:17,自引:6,他引:11
本文详细介绍了目前RTM工艺中最先进的两种真空辅助成型技术渗透介质辅助成型及引流槽辅助成型,采用这两种技术的RTM工艺能够制造超厚超大的产品,适应更加广阔市场需求,同时,真空辅助RTM成型技术RTM工艺的应用领域进一步扩大。 相似文献
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VARI工艺初探 总被引:1,自引:0,他引:1
卢峰 《玻璃钢/复合材料》1996,(6):26-28
本文在对VARI工艺进行初步研究的基础上,对原材料选用、模具设计制造和工艺过程等进行简要的论述。 相似文献
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叙述了真空辅助成型工艺(VARI)工艺特点及其用于建筑物加固修复的重要性、优越性和应用前景;自制了一套简易实验装置;归纳并阐述了建筑物加固修复用VARI技术的主要内容;依据国内现状,提出了该领域亟待开展的研究工作。 相似文献
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对VARI制备高长径比复合材料过程中的树脂流动行为进行模拟与实验研究,利用PAM-RTM软件模拟树脂流动过程,讨论了各工艺参数对树脂流动的影响,并通过实验测试对模拟结果进行了验证与比较。研究表明,纤维增强体孔隙率越大、注射压力越大和树脂粘度越低,树脂的填充速度越快。在模具直径φ4 mm、注射压力0.3 MPa、树脂粘度≤0.9Pa˙s和纤维体积分数≤60%的情况下,可以实现较长试件的快速注射,所需注胶时间最高不超过2 h。 相似文献
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Resin infusion was modeled and analytic solutions were obtained for vacuum assisted resin transfer molding (VARTM). Compaction behavior of the fiber preform was examined experimentally and the influence of compressibility of the preform on the resin infusion was investigated mathematically. Flow front advancement through the preform was predicted by the analytic model proposed in the present study. The model provided pressure and thickness distributions of the region impregnated by the resin. For verification of the analytic solutions, a resin infusion experiment and a mold filling simulation for VARTM were performed and compared with the analytic ones. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers. 相似文献
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In Vacuum Assisted Resin Transfer Molding (VARTM) where a sacrificial medium is used to facilitate the resin flow, the velocity of the resin varies drastically between inside the sacrificial medium and inside the fiber preform. Although the thickness-to-length ratio of a VARTM product is usually small, a 3-D analysis is required for analyzing the lead-lag flow in the two different media. The problem associated with the full 3-D analysis is the CPU time. A full 3-D numerical mesh comprising a large number of nodes requires a CPU time impractical on most computer platforms. In this study, a dual-scale analysis technique was proposed. First, the flow analysis for the entire calculation domain was conducted in 2.5-D. Using the results of the 2.5-D calculation, the 3-D analysis was performed for a small area of special concern. In some numerical examples, the local 3-D analysis could discover an eccentric flow pattern as well as the lead-lag flow that would inevitably be neglected in 2.5-D simulations. The global-local analysis technique practiced in this study can be used to analyze the intricate flow of resin through non-uniform media in affordable CPU times. Polym. Compos. 25:510–520, 2004. © 2004 Society of Plastics Engineers. 相似文献