碳纤维层合板分层损伤声发射特性研究
发布时间：2019-05-12 06:46
【摘要】：碳纤维复合材料以其高比强度、比模量,性能可设计、易于整体成形等诸多优点被广泛应用于军事、民用等领域,如在航天火箭、飞机、导弹、风电叶片等制造中作为结构材料、功能材料或结构与功能集成材料,并且呈逐渐从简单零部件、次承力部件向大型复杂结构件、主承力结构件转化的趋势。抗剪切能力差是复合材料的主要缺点,特别是层合结构,所以对复合材料材料在剪切力作用下损伤模式的无损检测显得尤为重要。复合材料层间性能取决于基体性能,层间材料性能仅为纤维方向的几十分之一,分层损伤破坏是复合材料最主要的破坏形式。因此,本文对碳纤维复合材料分层损伤过程进行了研究分析。本文建立一个碳纤维复合材料开孔层合板面内损伤模型来模拟此材料在面内剪切力作用下的损伤失效形式。利用ABAQUS的子程序功能,二次开发了复合材料横向初始损伤准则,在纤维方向由纤维主导的损伤采用Hashin准则,基体主导的损伤采用Puck作用面准则。对[0°/90°]14、[45°/-45°]14两种铺层方式的T700碳纤维复合材料开孔层合板面内剪切过程进行了有限元分析,研究分析了剪切过程中出现的损伤失效形式以及损伤演化过程。对[0°/90°]14、[45°/-45°]14两种铺层T700碳纤维复合材料开孔层合板剪切损伤进行声发射监测实验研究,并利用光栅光纤技术测量实验过程中试件的应变过程,研究了各损伤破坏过程中的声发射特性,建立了损伤失效形式与声发射信号间的联系。并通过实验载荷、应变曲线以及损伤形貌的分析与有限元分析结果进行比较,分析结果和实验结果能够得到互相验证。利用K-means聚类方法对碳纤维复合材料面内剪切过程的声发射信号进行了聚类分析,选取计数和持续时间作为特征参数,分析了T700碳纤维复合材料剪切过程声发射信号的模式识别,为声发射监测预报碳纤维复合材料损伤失效提供了实验依据。
[Abstract]:Carbon fiber composites have been widely used in military, civil and other fields because of their high specific strength, specific modulus, performance design, easy overall forming and many other advantages, such as space rockets, aircraft, missiles and so on. Wind turbine blades are used as structural materials, functional materials or structural and functional integration materials, and show a trend of gradual transformation from simple parts, secondary bearing components to large complex structural parts and main bearing structural parts. The poor shear resistance of composites is the main disadvantage of composites, especially the laminated structure, so it is particularly important to nondestructive testing of damage modes of composites under shear force. The interlaminar properties of composites depend on the properties of matrix. The properties of interlaminar materials are only one tenth of the fiber direction. Delamination damage is the most important failure form of composites. Therefore, the delamination damage process of carbon fiber composites was studied and analyzed in this paper. In this paper, an in-plane damage model of carbon fiber composite porous laminated plate is established to simulate the damage failure mode of the material under in-plane shear force. Based on the subroutine function of ABAQUS, the transverse initial damage criterion of composites is developed. The Hashin criterion is used for the damage dominated by fiber in the fiber direction, and the Puck action surface criterion is used for the damage dominated by matrix. The in-plane shear process of [0 掳/ 90 掳] 14 and [45 掳/-45 掳] 14 laminated T700 carbon fiber composites was analyzed by finite element method. The damage failure form and damage evolution process in shear process are studied and analyzed. The shear damage of [0 掳/ 90 掳] 14 and [45 掳/-45 掳] 14 laminated T700 carbon fiber composites was studied by acoustic emission monitoring experiment, and the strain process of the specimen was measured by grating fiber technique. The acoustic emission characteristics of each damage process are studied, and the relationship between the damage failure form and the acoustic emission signal is established. The results of experimental load, strain curve and damage morphology are compared with those of finite element analysis, and the analysis results and experimental results can be verified by each other. The acoustic emission signals of carbon fiber composites during in-plane shear process were analyzed by K-means clustering method, and the counting and duration were selected as the characteristic parameters. The pattern recognition of acoustic emission signal in shear process of T700 carbon fiber composites is analyzed, which provides an experimental basis for acoustic emission monitoring and prediction of damage failure of carbon fiber composites.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB332;TQ342.742
，
本文编号：2475189
[Abstract]:Carbon fiber composites have been widely used in military, civil and other fields because of their high specific strength, specific modulus, performance design, easy overall forming and many other advantages, such as space rockets, aircraft, missiles and so on. Wind turbine blades are used as structural materials, functional materials or structural and functional integration materials, and show a trend of gradual transformation from simple parts, secondary bearing components to large complex structural parts and main bearing structural parts. The poor shear resistance of composites is the main disadvantage of composites, especially the laminated structure, so it is particularly important to nondestructive testing of damage modes of composites under shear force. The interlaminar properties of composites depend on the properties of matrix. The properties of interlaminar materials are only one tenth of the fiber direction. Delamination damage is the most important failure form of composites. Therefore, the delamination damage process of carbon fiber composites was studied and analyzed in this paper. In this paper, an in-plane damage model of carbon fiber composite porous laminated plate is established to simulate the damage failure mode of the material under in-plane shear force. Based on the subroutine function of ABAQUS, the transverse initial damage criterion of composites is developed. The Hashin criterion is used for the damage dominated by fiber in the fiber direction, and the Puck action surface criterion is used for the damage dominated by matrix. The in-plane shear process of [0 掳/ 90 掳] 14 and [45 掳/-45 掳] 14 laminated T700 carbon fiber composites was analyzed by finite element method. The damage failure form and damage evolution process in shear process are studied and analyzed. The shear damage of [0 掳/ 90 掳] 14 and [45 掳/-45 掳] 14 laminated T700 carbon fiber composites was studied by acoustic emission monitoring experiment, and the strain process of the specimen was measured by grating fiber technique. The acoustic emission characteristics of each damage process are studied, and the relationship between the damage failure form and the acoustic emission signal is established. The results of experimental load, strain curve and damage morphology are compared with those of finite element analysis, and the analysis results and experimental results can be verified by each other. The acoustic emission signals of carbon fiber composites during in-plane shear process were analyzed by K-means clustering method, and the counting and duration were selected as the characteristic parameters. The pattern recognition of acoustic emission signal in shear process of T700 carbon fiber composites is analyzed, which provides an experimental basis for acoustic emission monitoring and prediction of damage failure of carbon fiber composites.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB332;TQ342.742
，
本文编号：2475189
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