增强体形态对钛基复合材料力学行为的影响

发布时间：2018-08-03 12:11

【摘要】：目前，在金属复合材料领域，钛基复合材料在众多工业领域的广泛应用已经给很多行业带来了方便，凭借其自身耐高温、抗腐蚀能力强、二次加工性好等优异的综合性能，目前已被大规模地应用在航海、石油、化工、飞机制造等领域。钛基复合材料按照其增强方式，可分为连续纤维增强型和颗粒增强型两大类。但由于纤维增强型钛基复合材料存在各向异性，制造技术复杂，成本较高等原因。所以，国内外众多科研学者已经开始将研究颗粒增强型钛基复合材料的力学性能作为新阶段主要的科研方向和目标，并且经过众多实验及数据的探索，已经收获了丰硕的科研成果，为颗粒增强型钛基复合材料的发展提供了有利的理论依据。本文基于颗粒增强型钛基复合材料的有限元模型，利用大型通用结构分析软件ANSYS，，在细观模型中分析复合材料的综合力学性能，并对复合材料中基体与增强体之间的相互关系和相互影响展开了探索及讨论，主要包括以下内容：（1）建立有限元模型，考察不同增强体颗粒形状对钛基复合材料界面应力分布的影响。分别建立模型并分析圆球形颗粒、圆柱形颗粒时应力场的不同分布情况，结果表明：圆球形颗粒对颗粒增强钛基复合材料增强效果较好。（2）建立碳纳米管增强钛基复合材料的三维分析模型，通过分别施加受压载荷及拉伸载荷并观察其应力云图结果。研究发现，两种载荷作用下，基体中碳纳米管的顶部位置，应力变化均比较明显地呈现急剧变化趋势，而在碳纳米管中部位置，变化均趋于平缓，在此区域上应力为一个稳定值。因此，在碳纳米管中部区域所受的载荷传递充分。 ⑶利用ANSYS建立三维碳纳米管增强钛基复合材料分析模型，考察当碳纳米管处于不同相位角分布时，对复合材料界面应力分布的不同影响。通过结果比较，当相位角为＝15o时，颗粒增强钛基复合材料的增强效果较好。
[Abstract]:At present, the extensive application of titanium matrix composites in many industrial fields has brought convenience to many industries, with its excellent comprehensive properties such as high temperature resistance, strong corrosion resistance, good secondary processing, and so on. At present, it has been widely used in navigation, petroleum, chemical industry, aircraft manufacturing and so on. Titanium matrix composites can be divided into continuous fiber reinforced type and particle enhanced type according to their reinforcement mode. However, due to the anisotropy of fiber reinforced titanium matrix composites, the manufacturing technology is complex and the cost is high. Therefore, many researchers at home and abroad have begun to study the mechanical properties of particulate reinforced titanium matrix composites as the main research direction and goal in the new stage, and through many experiments and data exploration, Abundant scientific research results have been obtained, which provides a favorable theoretical basis for the development of particle reinforced titanium matrix composites. Based on the finite element model of particle reinforced titanium matrix composite, the comprehensive mechanical properties of the composite are analyzed in the mesoscopic model by using the large-scale general structure analysis software ANSYS. The relationship and interaction between matrix and reinforcements in composites are discussed. The main contents are as follows: (1) the finite element model is established. The effect of particle shape of different reinforcements on the interfacial stress distribution of titanium matrix composites was investigated. The different distributions of the stress field of spherical and cylindrical particles were established and analyzed respectively. The results show that the spherical particles have a good effect on the reinforced titanium matrix composites. (2) the three-dimensional analysis model of carbon nanotube reinforced titanium matrix composites is established. The results of stress cloud diagram were observed by applying compressive load and tensile load respectively. It is found that the stress changes at the top of the carbon nanotubes in the matrix show a sharp change trend under the action of two kinds of loads, while in the middle of the carbon nanotubes, the changes tend to be gentle. The stress in this region is a stable value. Therefore, the load transfer in the middle region of carbon nanotubes is sufficient. 3 using ANSYS to establish a three-dimensional analysis model of carbon nanotube reinforced titanium matrix composites, and to investigate the distribution of carbon nanotubes at different phase angles. Different effects on interfacial stress distribution of composites. The results show that when the phase angle is 15 o, the effect of particle reinforced titanium matrix composites is better.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB333

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