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STRESS ANALYSIS OF TUBULAR JOINTS WITH WELD EFFECTS

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China Ocean Engineering 1989年第1期4卷 51-58页

作者： zhang, shengkun Lei, Ziming Shanghai Jiao Tong Univ China

In this paper the penalty element and the virtual beam element are proposed to handle the weak connection between the shell element and the 3-D solid element to take weld effects into account in stress analysis. In the mixed finite element method model presented here, the weld zone is discreted by plate-shell elements and 3D isoparametric elements. Numerical calculations have been performed for T-joint. The results obtained with this model are verified by experimental data. The location of the hot spot and stress concentration factors are greatly affected by the shape and size of the weld.

关键词： Mathematical Techniques Finite Element Method Offshore Structures Tubes Stresses Welds

Modification of Wirsching’s Model for Fatigue Reliability Analysis

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China Ocean Engineering 1998年第2期13卷 163-172页

作者： Ni, Kan zhang, shengkun Qian, Renjie Shanghai Jiao Tong Univ Sch Naval Architecture & Ocean Engn Shanghai 200030 Peoples R China

First, Wirsching's model, which is widely employed in fatigue reliability anlysis of marine and offshore structures, is analysed systematically. It is found that the very important random variable A in Wirsching's model can not be directly determined from fatigue experiment because of the irreversibility of fatigue test, and in fact, what Wirsching studied from testing results is not A but a of the statistical Miner's rule. Second, by use of the statistical Miner's rule, a modified Wirsching's model is proposed. Thirdly and more importantly, based on the two-dimensional probabilistic Miner's rule, a new model is established for fatigue reliability analysis of structural components subjected to specified cyclic loading of variable amplitude or stochastic time history. In the end, an example is presented, from which it will be seen that this new model is very convenient to use and feasible to engineering practice.

关键词： variable amplitude stochastic loading time history fatigue reliability Wirsching's model two-dimensional probabilistic Miner's rule

THE RELIABILITY ANALYSIS OF STATICALLY INDETERMINATE STRUCTURES SUBJECTED TO MULTI-RANDOM LOADS

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Chinese Journal of Aeronautics 1989年第4期 234-240页

作者： zhang shengkun Shanghai Jiao Tong University

The incremental-limit analysis is introduced to establish the limit state equationsautomatically. Using Ferry load combination model and Rackwicz transformation,the multi-random load effect is taken into account. Two ... 详细信息

关键词： Pro THE RELIABILITY ANALYSIS OF STATICALLY INDETERMINATE STRUCTURES SUBJECTED TO MULTI-RANDOM LOADS

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环肋加劲壳屈曲的随机分析

上海交通大学学报 1991年第4期25卷 18-27页

作者：张圣坤崔崴上海交通大学船舶及海洋工程系鞍钢设计院

给出了广义特征方程的随机有限元公式系统,建立了轴对称加劲壳屈曲分析的特征矩阵,在综合考虑各设计变量不确定性和随机均匀初始缺陷情况下,结合PEPM 法得到了屈曲临界载荷的随机特征值,并进行了可靠性分析.

关键词：壳体屈曲随机有限元法环肋加劲

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船舶中横剖面结构设计专家系统外壳

上海交通大学学报 1996年第8期30卷 67-72页

作者：张兴福张圣坤上海交通大学船舶及海洋工程系上海

结合专家经验和规范要求的设计是最为常用的船舶设计方法之一．不同的船型需要不同的经验知识和规范要求，但面向的对象和设计的主要步骤都是一致的．本文讨论了如何开发专家系统外壳以提供现成的知识表达方法、设计步骤和辅助程序，从... 详细信息

结合专家经验和规范要求的设计是最为常用的船舶设计方法之一．不同的船型需要不同的经验知识和规范要求，但面向的对象和设计的主要步骤都是一致的．本文讨论了如何开发专家系统外壳以提供现成的知识表达方法、设计步骤和辅助程序，从而可以更有效地帮助建立不同船型的专家系统并开发了双底双壳油轮中横剖面结构设计的专家系统．

关键词：专家系统外壳规范设计中横冲面船舶设计

I-V and C-V properties of TiO_2 thin film by pulsed-laser reactive deposition

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Chinese Science Bulletin 1998年第16期43卷 1344-1349页

作者： FU Zhengwen 1, ZHOU Mingfei 1, zhang shengkun 2,CHEN Lianyao 2 and QIN Qizong 1 1. Laser Chemistry Institute, Fudan University, Shanghai 200433, China 2. Department of Physics, Fudan University, Shanghai 200433, China Laser Chemistry Institute Fudan University Shanghai China Department of Pnysics Fudan University Shanghai China

TiO-2 thin films have bee deposited on p-Si(111) substrates by pulsed-laser ablation of metallic Ti target in the O-3 ambient. The current-voltage and capacitance-voltage of the Al/TiO-2/Si capacitors are measured. The results show that the dielectric constant of thin film after being annealed at 700℃ is found to be 46, and the border trap density and the interface state density at the TiO-2/p-Si interface are 1.8×10 12 cm -2 and 2×10 12 eV -1·cm -2, respectively. The conduction mechanisms of as-deposited films are also discussed.

关键词： TiO-2 dielectric properties electrical properties pulsed-laser deposition.