陶瓷材料三点及四点弯曲断裂强度关系之讨论

 利用Katayama在一种Si断裂强度;弯曲试验;加载因子;Weibull模量;fracture strength, bending test, load factor, Weibull modulus2002年6月25日2003-12-10利用Katayama在一种Si3N4陶瓷得到的实验数据，考察了一条关联陶瓷材料三点及四点弯曲断裂强度的式子，其准确度较好，简要地导出了一般教材上较少提及其推导的四点弯曲加载因子。     

旋转薄壳稳定性的数值分析

用数值方法求解旋转薄壳稳定性问题的主要困难在于:对任意应力状态下的旋转壳进行稳定性分析,各谐波间彼此耦合,致使方程推导的复杂性和计算量都增大,本文采用[3]所提供的单元及经典的能量判据,在最一般的提法下构造了有限元列式,详细讨论了耦合情况,利用本文方案编制程序并进行了许多算例分析,结果令人满意。同时表明在某些情况下边界条件对临界载荷的影响很大,这可以部分地解释古典稳定性分析结果与实验偏差较大以及实验数据分散的原因。     

结构在冲击载荷作用下的实验研究

本文报道了为求解结构在冲击载荷作用下大度形响应而做的实验研究,以不同速度运行的物体垂直冲击圆拱、刚架和旋转扁壳,记录由此引起的冲击点位移、速度曲线以及某些关键点的动态应变历史,从而为寻找规律、建立模型提供实证资料。     

Interaction of an internal gravity current with a submerged circular cylinder

The problem of hydrodynamic loads due to the interaction of a gravity current propagating over a bottom channel with a submerged circular cylinder is studied experimentally. It was shown that in the examined range of parameters, the hydrodynamic loads are simulated after Froude. The hydrodynamic loads are maximal if the cylinder lies on the bottom, and they decrease rapidly with increase in the distance from the cylinder to the channel bottom. The effects of mixing and entrainment on the nature of the hydrodynamic loads are considered.Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 46, No. 2, pp. 81–90, March–April, 2005.     

A numerical method for clamped thin rectangular plates carrying a uniformly distributed load

A numerical method for clamped thin rectangular plates carrying a uniformly distributed load and the exact solution of the governing equations are given. The solution is presented in a simple form suitable for direct practical use. The method is a very simple and practical approach. The results are compared with those reported in the previous papers Published in Prikladnaya Mekhanika, Vol. 43, No. 6, pp. 126–143, June 2007.     

塔式起重机疲劳载荷谱的编制

用现场实测与有限元动态响应分析相结合的方法，获得DBQ3000塔式起重机的动部件在各种作业工况下的应力-时间历程，经雨流计数与在役历史工况统计分析，编制了各关键零部件的疲劳载荷谱。为该类型塔机的疲劳寿命预估、结构疲劳设计等提供了必要的裁荷依据。     

Contact Problem for an Elastic Orthotropic Half-Strip

The paper discusses the problem on a rigid flat-based die forced into a half-strip. The material of the half-strip, whose semiinfinite sides are fixed, is orthotropic; the principal axes of anisotropy coincide with the Cartesian coordinate axes. Friction between the die and the half-strip is taken into account. The problem is solved by an asymptotic method developed by the authors. Some numerical results are presented     

细长杆屈曲后中点位移的确定

利用精确的曲率表达式建立了Euler杆在考虑几何非线性时的微分方程,编制了求解程序,通过算例揭示了压力大于分叉荷载时压力与中点屈曲位移的关系.研究表明,当压力达到分叉点时,Euler杆不但不会丧失承载力,相反其承载力却有一定程度的增长.研究结论与实验结果完全吻合.     

移动车辆作用下弹性基础无限长梁的动力响应

通过坐标变换方法,研究了匀速移动的车辆对弹性基础无限长梁的动力响应,给出了位移和内力的计算方法,将车辆简化为移动力,移动质量,移动的振动质量三种模型,比较了它们对梁的影响,对某型带式舟桥的数值分析表明,振动质量模型较合理,给出了浮桥计算时,动力放大系数的建议值     

一类非圆空腔的冲击响应问题

本文用扰动形式的映射函数对非圆空腔在冲击载荷作用下的动态响应问题进行了摄动求解,给出了“0”级及“1”级摄动解的具体算式及阶跃脉冲载荷作用下椭圆腔的数值算例。