压电复合材料圆柱壳在机械、热和电场载荷下的层间应力研究
本文关键词:压电复合材料圆柱壳在机械、热和电场载荷下的层间应力研究 出处:《上海交通大学》2015年硕士论文 论文类型:学位论文
更多相关文章: 压电复合材料壳 任意角铺层 层间应力 热效应 电场效应
【摘要】:复合材料具有重量轻、强度高、加工成型方便、弹性优良、耐化学腐蚀和耐候性好等特点,已逐步取代木材及金属合金,广泛应用于航空航天、汽车、电子电气、建筑、健身器材等领域。压电材料利用其正逆压电效应可以制造智能换能器件,在智能材料体系中具有十分重要的地位,引起国内外广泛关注,但其力学性能较差、脆性大、难于加工。将压电材料和复合材料结合起来的压电复合材料综合两方面的优点,在医疗、传感、测量、控制等领域有着广泛的应用,比如在电子技术中利用压电复合材料制作各种敏感和传感器件,在飞行器控制中利用压电材料制造自适应机翼等。本文主要介绍机械、热和电场载荷对两端简支或固支条件下压电复合材料圆柱壳层间应力影响的理论解析方法和数值模拟计算,第一部分是理论推导和解析方法,首先利用正交各向异性弹性理论获得单独压电层或纤维增强层用未确定常数表示的通用解,其中纤维层增强方向和铺层形式可以是任意的。然后应用层间应力和位移连续性条件、压电复合材料圆柱壳内外表面压力边界条件和两端支撑边界条件可以求出通用形式解中的未知常数。因此能够获得压电复合材料圆柱壳层间应力的精确解。除了压电效应外,讨论了热效应和±θ角铺层的影响,并预测各种条件组合情况下的层间应力。结果显示压电效应可以用来减少层间应力。第二部分是算例求解,按照理论解析解表达公式利用Fortran编程求解各种算例,得到不同情况下的应力和位移曲线,并作相应的分析和讨论。第三部分是仿真模拟,利用ANSYS14.5建立有限元模型,施加各种边界条件和载荷,得到层合壳的层间应力曲线,并与理论计算结果进行比对验证。最后进行结果分析,工作总结及进一步研究改进的方向。
[Abstract]:With the advantages of light weight, high strength, convenient processing, good elasticity, good chemical corrosion resistance and good weathering resistance, the composite has gradually replaced wood and metal alloys, and has been widely used in aerospace and automobile. Piezoelectric materials can be used to make intelligent transducer parts by its direct and inverse piezoelectric effect. Piezoelectric materials have a very important position in the intelligent material system and have attracted wide attention at home and abroad. But its mechanical property is poor, brittleness is big, difficult to process. The piezoelectric composite which combines the piezoelectric material and the composite material synthesizes two aspects of advantages, in the medical treatment, the sensor, the measurement. Control has a wide range of applications, such as the use of piezoelectric composites in electronic technology to make a variety of sensitive and sensor devices. In aircraft control, piezoelectric materials are used to fabricate adaptive wings and so on. This paper mainly introduces the mechanism. The theoretical analytical method and numerical simulation of the effect of thermal and electric field loads on the stresses between the cylindrical shells of piezoelectric composites under the condition of simply supported or clamped at both ends are presented. The first part is the theoretical derivation and analytical method. Firstly, the general solution of a single piezoelectric layer or a fiber reinforced layer is obtained by using the orthotropic elastic theory. The reinforcing direction and the layering form of the fiber layer can be arbitrary, and then the continuity condition of interlayer stress and displacement is applied. The boundary conditions of pressure on the inner and outer surface of piezoelectric composite cylindrical shells and the boundary conditions of support at both ends can be used to obtain the unknown constants in the general solution. Therefore, the exact solution of the interlayer stress of piezoelectric composite cylindrical shells can be obtained. Beyond the piezoelectric effect. The thermal effect and the effect of 卤胃 angle layer are discussed, and the interlaminar stress under various conditions is predicted. The results show that the piezoelectric effect can be used to reduce the interlaminar stress. According to the theoretical analytical solution expression formula, Fortran programming is used to solve various examples, and the stress and displacement curves under different conditions are obtained, and the corresponding analysis and discussion are made. The third part is the simulation. The finite element model is established by ANSYS14.5, and the interlaminar stress curves of laminated shells are obtained by applying various boundary conditions and loads. The results are compared with the theoretical results. Finally, the results are analyzed. Summary of the work and further study of the direction of improvement.
【学位授予单位】:上海交通大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TB33
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