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Stress and reliability analyses of multilayered composite cylinder under thermal and mechanical loads.

机译：热和机械载荷下多层复合材料圆柱体的应力和可靠性分析。

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摘要

The coupling resulting from the mutual influence of material thermal and mechanical parameters is examined in the thermal stress analysis of a long, hollow, multilayered, isotropic composite cylinder subjected to sudden axisymmetric external and internal temperature. The method of complex frequency response functions together with the Fourier transform technique is utilized.; Because coupling parameters for some composite materials, such as carbon-carbon, are very small, the effect of coupling is neglected in the orthotropic thermal stress analysis. The stress distributions in long, hollow, multilayered orthotropic cylinders subjected to sudden axisymmetric temperature loading combined with dynamic pressure as well as asymmetric temperature loading are also obtained. The method of Fourier series together with Laplace transform is utilized in solving the heat conduction equation and thermal stress analysis. The inertial term is considered and the perturbation technique is applied to cylinders subjected to dynamic pressure loading.; For brittle materials, like carbon-carbon composite, the strength variability is represented by two or three parameter Weibull distributions. The "weakest link" principle which takes into consideration both the applied stresses and the effected volume of material is used in the reliability analyses for both the isotropic and orthotropic carbon-carbon composite cylinders.; The complex frequency response analysis is performed on a long hollow multilayed orthotropic cylinder under asymmetrical thermal load. Both deterministic and random thermal stress and reliability analyses can be based on the results of this frequency response analysis.; The stress and displacement distributions and reliability of rocket motors under static or dynamic line loads are analyzed by an elasticity approach. Rocket motors are modeled as long hollow multilayered cylinders with an air core, a thick isotropic propellant inner layer and a thin orthotropic kevlar-epoxy case. The case is treated as a single orthotropic layer or a ten layered orthotropic structure. Five material properties and the load are treated as random variables with normal distributions when the reliability of the rocket motor is analyzed by the first-order, second-moment method (FOSM).
机译：在经受突然的轴对称内外温度的长空心中空多层各向同性复合材料圆柱体的热应力分析中，检查了由材料热和机械参数的相互影响导致的耦合。利用复数频率响应函数的方法和傅立叶变换技术。由于某些复合材料（例如碳-碳）的耦合参数非常小，因此在正交各向异性热应力分析中忽略了耦合的影响。还获得了在长形，空心，多层正交异性圆柱体中承受突然的轴对称温度载荷和动压力以及不对称温度载荷的应力分布。将傅里叶级数与拉普拉斯变换相结合的方法用于求解热传导方程和热应力分析。考虑惯性项，并将摄动技术应用于承受动态压力载荷的气缸。对于脆性材料，如碳-碳复合材料，强度变化性由两个或三个参数威布尔分布表示。在考虑各向同性和各向同性碳-碳复合材料圆柱体的可靠性分析中，采用了“最弱连接”原理，该原理同时考虑了施加的应力和材料的有效体积。复杂频率响应分析是在不对称热负荷下对长空心多层正交各向异性圆柱体进行的。确定性和随机热应力以及可靠性分析都可以基于该频率响应分析的结果。通过弹性方法分析了静态或动态线载荷下火箭发动机的应力，位移分布和可靠性。火箭发动机建模为带有空心的长空心多层圆柱体，厚的各向同性推进剂内层和稀薄的正交各向异性凯夫拉尔环氧树脂外壳。外壳被视为单个正交各向异性层或十层正交各向异性结构。当通过一阶第二矩方法（FOSM）分析火箭发动机的可靠性时，将五种材料特性和载荷视为具有正态分布的随机变量。

著录项

  • 作者

    Wang, Xiaohua.;

  • 作者单位

    Virginia Polytechnic Institute and State University.;

  • 授予单位 Virginia Polytechnic Institute and State University.;
  • 学科 Applied Mechanics.
  • 学位 Ph.D.
  • 年度 1992
  • 页码 217 p.
  • 总页数 217
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用力学;
  • 关键词

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