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首页> 外文会议>International Conference on Composite Materials >EFFECTS OF CURE PRESSURE ON VOID CONTENT AND ULTRASONIC ATTENUATION COEFFICIENT OF CARBON FIBRE REINFORCED COMPOSITE
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EFFECTS OF CURE PRESSURE ON VOID CONTENT AND ULTRASONIC ATTENUATION COEFFICIENT OF CARBON FIBRE REINFORCED COMPOSITE

机译：固化压力对碳纤维增强复合材料空隙含量和超声衰减系数的影响

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The manufacture procedure of carbon fibre reinforced composites has decisive effects on the quality of the end product[1-4]. Cure pressure is considered as a key factor to influence the formation and growth of voids, to which the ultrasonic attenuation of composite laminates is quite sensitive. Numerous works have been undertaken on describing the relevance between cure pressure and voids in composite laminates[5-9]. A systematic research that established a pressure-temperaturehumidity stability map was conducted by Kardos et al.[5], in order to identify conditions for void growth or dissolution. Many authors found an exponentially decrease of void content in the ordinary laminates along with the increase of cure pressure[6-8]. Jong et al.[9] suggested an increase of the void content in the early stage of the pressure increasing in carbon/phenolic laminates, which resulted from the gas products generated during the cure reaction. However, there have not been such studies on carbon/benzoxazine(BBZ) laminates. On one hand, the cure reaction of benzoxazine does not generate gas products, which is similar to the ordinary resin. On the other hand, benzoxazine was synthesized by phenols and formaldehyde, which is similar to phenolic resin. Many experimental methods have been taken by researchers in consideration of the relationship between the void and ultrasonic attenuation[3][10-14]. Almeida et al.[3] presented a fracture criterion correlating the ultrasonic attenuation to the strength of composite laminates, which aimed at determining the maximum allowable ultrasonic attenuation of a composite laminate for a specific loading condition. An easily operable and potentially useful method which was developed by Stone and Clarke[10], built a bi-linear relationship to describe the variation of attenuation with void content. Efforts were also taken by several authors to establish acceptance levels for the attenuation level in the ultrasonic inspection of composite laminates[11-12]. Further, an ultrasonic spectroscopic method was applied to broadband through transmission measurements in composites with voids by Jeong et al.[13][14]. Nevertheless, it requires a large number of tests for the complete and reliable data from any experimental method and the result varies widely according to the composite system.
机译：碳纤维增强复合材料的制造方法对最终产品的质量进行了决定性影响[1-4]。固化压力被认为是影响空隙的形成和生长的关键因素，其中复合层压材料的超声衰减是非常敏感的。已经进行了许多作品，用于描述复合材料层压物中固化压力和空隙的相关性[5-9]。通过Kardos等人进行了建立的压力温度稳定性图的系统研究。[5]，以鉴定空隙生长或溶解的条件。许多作者发现普通层压板中的空隙含量随着固化压力的增加[6-8]。 Jong等人[9]建议在碳/酚类层压板中增加压力增加的空隙含量的增加，这是由固化反应期间产生的气体产品产生的。然而，还没有关于碳/苯并恶嗪（BBZ）层压材料的研究。一方面，苯并恶嗪的固化反应不会产生气体产品，其类似于普通树脂。另一方面，苯并恶嗪由酚和甲醛合成，其类似于酚醛树脂。研究人员考虑了空隙和超声衰减之间的关系[3] [10-14]，研究人员已经采取了许多实验方法。 Almeida等。[3]提出了裂缝标准，将超声衰减与复合层压板强度相关，这旨在确定用于特定负载条件的复合层压板的最大允许超声衰减。由石头和克拉克[10]开发的易于操作和潜在有用的方法，构建了一种双线性关系，以描述具有空隙含量的衰减变化。若干作者还采取努力来建立复合层压板超声波检查中衰减水平的验收水平[11-12]。此外，通过Jeong等人的复合材料中的复合材料中的透射测量施加超声波光谱法。[13] [14]。然而，它需要从任何实验方法的完整和可靠数据进行大量测试，结果根据复合系统而变化广泛。

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