电流变学研究进展

电流变学是近年来新兴的一门学科。本文从电流变学的发展概况，电流变流体，电流变效应的机理和电流变体的应用等４个方面对电流变学的概貌做了阐述，力求能准确地反映国际上电流变学的发展现状。     

激光辐照下有界圆厚板的热弹性弯曲响应分析

考虑板弯曲运动的旋转惯性效应和剪切变形效应，建立了轴对称热能沉积作用下，边界固支或简支圆厚板的热弹性弯曲运动控制方程。利用数学变换和摄动法，导出了各种温度－力学边界条件下板的热弹性弯曲挠度及截面广义转角的解析公式。给出了在空间Ｇａｕｓｓ型分布激光束辐照下，板整体弯曲响应的代表性数值计算结果，直观显示了板弯曲挠度的时空变化规律。     

旋转圆盘受均布压力作用时的摄动分析

本文对中心带轴匀速旋转圆盘在均布压力作用下的受力及变形问题进行了摄动分析，得到了受载条件为Ｊ＾２／ＪＨ＜＜１时，圆盘应力及形变的渐近解。其形变渐近解为Ｗｈｉｔａｋｅｒ函数形式比较表明，渐近解与Ｃｈｅｂｙｓｈｅｖ数值解有较好的一致性。     

在材料研制中的连续介质细观力学有限元建模现状评论（译文）

评述了机械载荷下材料力学行为有限元模拟的先进技术.分析 了考虑材料微观及细观结构情况下，对材料变形、损伤、断裂进行模 拟时各种方法的优缺点及发展前景.阐述了对材料行为模拟方法的发 展，包括基本的及先进的方法，如体胞方法、真实结构模拟、粘结区 模型等.分析了在先进新材料的开发中运用有限元方法的可能性     

DETERMINATION OF THE PERTURBATION PARAMETER IN LARGE DEFLECTION OF PLATES AND SHALLOW SHELLS BY MEANS OF THE LEAST SQUARE METHOD

In this paper the least square method of determination of the perturbation parameteris presented when the perturbation technique is used in the solution of large deflection ofaxisymmetrical plates and shallow shells.The examples of circular plates are calculatedand compared with the exact solution and other perturbation solutions. The results show thebest agreement with the exact solution among those perturbation solutions.     

用三步相移法测量温度场

提出了一种采用双参考光光路，并在再现阶段引入相移的方法来测量火焰温度场，克服了在记录阶段引入相移的不足，采用这种方法不仅可以测量准静态场，而且可以测量瞬态场。本文在计算温度时还采用了新的求解方法，守验表明这种方法提高了测量的速度和精度。     

板结构功率流的参数研究

板以及肋板结构在工程中有着广泛的应用，其振动嗓声问题一直受到理论和工程领域的关注。本文在板结构功率流理论的基础上￣［１］，对板的损耗因子和不同加肋形式对其功率流的影响进行了分析和测量。     

ASYMPTOTIC NON-STABILITY AND BLOW-UP AT BOUNDARY FOR SOLUTIONS OF A FILTRATION EQUATION

For a class of nonlinear filtration equation with nonlinear second-third boundary value condition, it is shown that a priori boundary of the solution can be estimated and controlled by initial data and integral on the boundary of the region. The priori estimate of the solutions was established by iterative method. By using this estimate the solutions may blow-up on the boundary of the region and thus it may have asymptotic non-stability.     

ON A NEW KIND OF METHODS TO SOLVE THE PLANE PROBLEMS OF TWO-PHASE FLOW THROUGH POROUS MEDIA

This paper presents a new kind of method for solving the planeproblems of two-phase flow in porous media.The ellipticalpartial differential equation for pressure distribution is sol-ved by the finite element method,and then the semi-analyticalsolution for pressure gradient is used to determine the new sa-turation field according to the existing exact formula describ-ing the saturation propagation along the streamlines.The maindistinguishing feature and advantage of this kind of method arethe ability to overcome the numerical dispersion which is inhe-rent in the ordinary numerical simulation methods.and thereby,to give a precise and clear-cut position of the saturation dis-continuity in the water-oil displacement front.moreover.thesaturation equation,which should commonly be solved simultan-eously or alternatively with the pressure equation,is complete-ly avoided,so that the computing time is greatly reduced.     

升船机结构抗震可靠度分析中若干问题的探讨

本文基于结构随机振动理论和首次超越破坏机制，以某大型升船机建筑结构为背景，应用三维有限元方法，首先对升船机建筑结构的随机地震反应问题进行了计算。在此基础上，对在不同地震烈度下大型升船机建筑结构的抗震可靠度及界限值的随机性对结构抗震可靠度的影响等问题进行了分析，探讨了基于Poisson过程假定和基于Markov过程假定的可靠度在不同地震烈度下的适用性、以及确定性界限和随机性界限对可靠度结果的影响等问题，得到了一些有应用价值的结果。最后，对在8、9度地震烈度下大型升船机建筑结构抗震可靠度分析模型的选用提出了建议。