双层复合材料杆的温度应力

基于平面弹性理论，用两个任意函数表示双层复合材料杆的应力，运用最小余能原理，求得了双层复合材料杆温度应力的封闭解。     

海底埋设双层管道的温度应力及变形的计算

本文讨论了海底埋设双层管道的分析方法，所得结果可供工程计算参考     

用光弹性法测双层复合板的应力强度因子

本文用光弹性法分析了双层复合材料结构的裂纹问题，研究了两种不同材料的存在对应力强度因子的影响，以及讨论了由于裂纹不断加深，应力强度因子的变化规律，并与计算的结果作了比较，在裂纹不接近界面情况下，两者结果吻合的较好。     

矩形截面杆的翘曲正应力

矩形截面杆的翘曲正应力申向东,康德基（内蒙古农牧学院水利系,呼和浩特０１００１８）杆在平面弯曲时,因剪切使横截面翘曲而产生的正应力,这里称为翘曲正应力,在材料力学教材中一般未给出计算表达式。本文用材料力学的一般方法求得了矩形截面杆在任意分布荷载作用下...     

各向异性复合材料的应力奇异性

本文根据各向异性材料的特征值与特征函数理论,用极其简单的矩阵形式,建立了复合楔形和裂纹止于两材料界面等情况下确定应力奇异阶次的特征方程,讨论了应力奇异性的一些特性,计算了各种情况下的应力奇异阶次。     

连续配筋混凝土路面温度应力的弹性解

视连续配筋混凝土路面为复合材料,利用复合材料力学等理论推导了配筋板的自生温度应力;建立了受温度作用时路面板的平衡微分方程组,将地基反力和板与地基间的摩擦力函数按照切比雪夫多项式展开,得到配筋板的约束变形与应力。通过和有关文献的比较表明了本文方法的合理性。     

圆柱杆侵彻过程及应力波传播分析

研究了初始侵彻速度为１０００ｍ／ｓ～２０００ｍ／ｓ的圆锥杆对半无限厚水泥靶的垂直侵彻过程及其应力波传播。针对初始侵彻速度范围内的撞击特点，发展了计算撞击力的刚体－流体撞击模型和计算靶体变形的法向膨胀理论。模拟动量定理和功能守恒定律，建立了圆锥杆垂直侵彻半元限厚水泫靶时的动力学模型。结非线性动力学方程的数值解，确定了撞击力。在些基础上，根据牛顿第二定律建立了圆锥杆的波动方程，研究了应力波在圆锥中的传     

任意厚度层合闭口柱壳的轴对称温度应力

基于层合柱壳混合状态方程和边界条件的弱形式，在轴对称情况下，建立了两端固支层合闭口柱壳的温度应力混合方程，给出了任意厚层合柱壳在温度荷载和机械荷载共同作用下的解析解。     

应力脉冲在变截面SHPB锥杆中的传播特性

为研究混凝土材料的动态力学性能 ,将原有的SHPB装置改装成直锥变截面式SHPB。系统分析了应力脉冲在直锥变截面杆中的传播特性 ,讨论了大小端杆径、过渡段长度以及锥角等对波传播的影响 ,为合理设计直锥变截面式SHPB装置提供了理论依据。     

复合材料应力分析的均匀化方法

建立了基于均匀化理论的确定复合材料结构应力场的方法．其实质是用均质的宏观结构和非均质的具有周期性分布的细观结构描述原结构；将力学量表示成关于宏观坐标和细观坐标的函数，并用细观和宏观两种尺度之比为小参数展开，用摄动技术将原问题化为一细观均匀化问题和一宏观均匀化问题．这两个问题的解确定了包含等效位移和一阶近似位移的位移场，由此获得应力场．利用该方法给出了圆柱形孔隙材料和单向纤维复合材料在单向拉伸时的应力场以及空隙材料简支梁的局部应力场，说明了该方法的有效性     

复合材料层合板粘弹性固化残余应力分析

基于Ｓｃｈａｐｅｒｙ积分型粘弹性本构关系，推导了考虑横向剪切效应的复合材料层合板线性热粘弹性有限元分析列式，对层合板的粘弹性响应和加工成型过程中的残余应力进行了分析，给出一些有意义的结果     

Thermal stresses analysis of ceramic/metal functionally gradient material cylinder

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复合材料层合板在加工固化后期降温速率对残余热应力的影响

本文采用非线性有限元方法，对材料性质与温度有关的复合材料层合板在加工固化后期降温过程中的温度速场和热应力场进行了分析，对降温度速率对板中固化残余热应力的影响进行了研究，获得一些对层合板固化成型工艺和固化残余热应力分析模型的选取均有意义的结果。     

Analytical solution of restrained torsional stresses and displacement for rectangular-section box bar with hontycomb core

Differential equation of restrained torsion for rectangular-section box bar with honeycomb core was established and solved by using the method of undetermined function. Non-dimension normal stress, shear stress acting in the faceplate and shear stress acting in the honeycomb-core and warping displacement were deduced. Numerical analysis shows the normal stress attenuates quickly along x-axis. Normal stress acting on the cross section at a distance of 20 h from the fixed end is only one per cent of that acting on the fixed end.     

Thermal stresses in infinite circular cylinder subjected to rotation

The present investigation is concerned with the effect of rotation on an infinite circular cylinder subjected to certain boundary conditions.An analytical procedure for evaluation of thermal stresses,displacements,and temperature in rotating cylinder subjected to thermal load along the radius is presented.The dynamic thermal stresses in an infinite elastic cylinder of radius a due to a constant temperature applied to a variable portion of the curved surface while the rest of surface is maintained at zero temperature are discussed.Such situation can arise due to melting of insulating material deposited on the surface cylinder.A solution and numerical results are obtained for the stress components,displacement components,and temperature.The results obtained from the present semi-analytical method are in good agreement with those obtained by using the previously developed methods.     

INTERLAMINAR STRESSES OF LAMINATED COMPOSITE BAR UNDER BENDING(Ⅱ)

A laminated composite bar of rectangular cross section consists of a middle portion ofone material as well as upper and lower identical cover plates of another material. Couplesformed by linear bending stresses act in the middle portion at the ends of the bar (Fig. la) tocause bending. Interlaminar stresses are to be found showing how the forces are transmittedthrough the glued surfaces to the cover plates.     

纤维增强复合材料热隐身斗篷设计

基于变换热动力学原理可获得具有热隐身性能的隐身结构(隐身斗篷)所需要的材料性质的空间分布。但这种材料性质的复杂分布形式以及局部热传导性能无限大等极值性质需求,使得隐身斗篷设计的实现非常困难,需要研究基于常规材料的隐身斗篷设计。本文基于常规材料的热隐身结构实现问题,提出了基于纤维增强复合材料圆环结构的实现热隐身的结构形式。首先,基于变换热动力学原理获得热隐身所需的热传导系数沿半径方向的变化规律;进而,通过设计复合材料不同位置的纤维铺设方式(含量和铺设方向)实现热隐身对材料性能的需求。选择金属银作为纤维,空气作为基体,设计出了具有热隐身性能的复合材料圆环结构纤维含量和铺设方向沿径向的分布方案。对该设计方案进行数值仿真,结果显示所设计的隐身结构具有良好的热隐身性能。由于设计方案基于常规材料,因此具有容易实现的优点。     

Thermal stresses in a viscoelastic three-phase composite cylinder

A thermoviscoelastic analysis of a three-phase composite cylinder is presented in this work. The solutions of the heat conduction and thermoelastic problem for three dissimilar media are derived based on the method of analytic continuation associated with the alternation technique. A rapidly convergent series solution for both the temperature and stress field, which is expressed in terms of an explicit general term of the corresponding homogeneous potential, is obtained in an elegant form. The hereditary integral in conjunction with the Kelvin–Maxwell model is applied to simulate the thermoviscoelastic properties while a thermorheologically simple material is considered. According to the correspondence principle, the Laplace transformed thermoviscoelastic solution is directly determined from the corresponding thermoelastic one. The real time solution can then be solved numerically by taking inverse Laplace transform. Finally, some typical examples of interfacial stresses are discussed.     

INTERLAMINAR STRESSES OF A LAMINATED COMPOSITE BAR UNDER BENDING(Ⅰ)

A laminated composite bar of rectangular cross section consists of(?) portion ofone material and upper and lower iden(?) cover plates of another(?)Compressiveand tensile forces each equal to P are (?)(?)at the ends of the upper andlower cover plates Fig (?)They form (?)(?)ends of the bar.Our (?)is to find theinterlaminar stresses or how the forces are (?) through the (?)(?)faces.     

复合材料/金属混合结构热应力分布规律

以飞机机身典型部位复合材料与Z型长桁螺栓连接为研究对象,采用Python脚本语言编程,在ABAQUS平台建立了6种紧固长度有限元模型,模拟飞机在高空低温的飞行环境,得到了混合结构的应力、应变分布规律。数值仿真结果表明:铝梁顶部应变结果呈现中间高、两边低的现象,紧固螺栓应变结果则呈现出相反的趋势;末端紧固件承受的剪切载荷最大,而中心的紧固件剪切载荷最小;该温度场结果与已有文献的试验测试结果误差在3℃以内,对复合材料与金属混合结构的设计具有一定意义。