摘要：This paper discusses some aspects of finite element computation,such as the automatic generation of finite element ,refinement of mesh,process of node density, distribution of load,optimum design and the drawing of stress contour, and describes the developing process of software for a planar 8 node element.

摘要：Alkali recovery aiming at recovering NaOH is the best available technology in China's pulp and paper industry;an alkali recovery boiler is a popular one among all alkali recovery units. For the purpose of designing the most reasonable tube-panel of an evaporator in a 1500 t/d alkali recovery boiler, a total of 8 kinds of cases are put forward for finite element analysis. The modeling, meshing and calculation are carried out for each case. The stress values and their distribution rules are revealed in this paper. The slotting size for the water tubes panel is analyzed by using the optimum design module of ANSYS. After all cases are compared with each other, the optimal one is developed and exemplified in conclusion.

摘要：The first acute myocardial infarction (MI) of an elderly male was determined through angiography to be due to an infarct of the circumflex artery. The angiogram also revealed chronic occlusion and diffuse disease of the left anterior descending artery (LAD). This had been compensated for by collateral circulation from the right coronary artery. Since the patient had no prior history of coronary artery disease, the chronic and collateralized disease of the LAD was presumed to be stable and this artery was not treated. Due to a history of aspirin intolerance a bare metal stent was implanted in the circumflex artery. Within hours after stenting the patient had a second acute MI. Despite no change in the angiogram, the EKG suggested that the LAD was the source of the second MI. Indeed, a drug-eluting stent implanted in the LAD resolved the patient’s signs and symptoms and he was discharged with a favorable outcome. The surprising second MI and the inconsistent stenting illustrate that when the unexpected occurs, there is no substitute for the judgment of a skilled clinician.

摘要：In order to study the influence of longitudinal slope on the mechanical response of steel deck pavement,a method of slope-modulus transformation was proposed for the mechanical analysis of the steel deck pavement based on the time-temperature equivalence *** the mechanical action on a slope,a finite element model of the deck pavement was established to determine the critical load position of tensileand shear stress of the steel deck ***,the influence of longitudinal slope on the mechanical response of the deck pavement under the conditions of uniform speed and emergency braking was *** results indicate that the maximum transverse tensile stress at the pavement surface and the maximum transverse shear stress at the pavement bottom are always greater than their longitudinal counterparts under uniform *** emergency braking,however,the critical slope gradient of t e maximum transverse and longitudinal tensile stress at t e pavement surface is 6%.The maximum longitudinal shear stess at t e pavement bottom is always greater ta n t e maximum tansverse shear *** stidy is helpful in t e strctural design of large longitudinal slope steel deck pavements.

摘要：The large-scale product has a big cylinder and the pressure-bearing capacity is also high. In the sealingtest, the water is filled in it to have the pressure test. But due to the over high pressure, the experiment tends todestroy the cylinder and the cover to cause the failure of the sealing and the waste of the cylinder and water. Sothis paper is to analyze how to add the small combined cylinder within the product cylinder. The water is filled be-tween the small cylinder and the product cylinder and the pressure on the cover is reduced during the sealing ex-periment.

摘要：The structure and working principle of a kind of permanent-magnet adsorption tracked wall-climbing ro-bot used in ship was analyzed in this paper. The robot can complete vertical climbing wall function when perma-nent-magnet adsorption tracked was driven by ac servo motor. In order to improve the load capacity and obstaclesurmounting ability of robot, a new permanent-magnet auxiliary caster adsorption mechanism and driven wheelfloating mechanism were used for the design of structure. In thispaper, the mechanical state of the permanent-mag-netic adsorption tracked climbing mechanism was analyzed. Through the magnetic simulation and experimental a-nalysis of magnetic adsorption system, the adsorption unit structure and electric drive system parameters of thepermanent-magnet tracked wall-climbing robot were reasonably designed.

摘要：Gravity dams are solid concrete structures that maintain their stability against design loads from the geometric shape, mass and strength of the concrete. The purposes of dam construction may include navigation, flood damage reduction, hydroelectric power generation, fish and wildlife enhancement, water quality, water supply, and recreation. The design and evaluation of concrete gravity dam for earthquake loading must be based on appropriate criteria that reflect both the desired level of safety and the choice of the design and evaluation procedures. In Bangladesh, the entire country is divided into 3 seismic zones, depending upon the severity of the earthquake intensity. Thus, the main aim of this study is to design high concrete gravity dams based on the U.S.B.R. recommendations in seismic zone II of Bangladesh, for varying horizontal earthquake intensities from 0.10 g - 0.30 g with 0.05 g increment to take into account the uncertainty and severity of earthquake intensities and constant other design loads, and to analyze its stability and stress conditions using analytical 2D gravity method and finite element method. The results of the horizontal earthquake intensity perturbation suggest that the stabilizing moments are found to decrease significantly with the increment of horizontal earthquake intensity while dealing with the U.S.B.R. recommended initial dam section, indicating endanger to the dam stability, thus larger dam section is provided to increase the stabilizing moments and to make it safe against failure. The vertical, principal and shear stresses obtained using ANSYS 5.4 analyses are compared with those obtained using 2D gravity method and found less compares to 2D gravity method, except the principal stresses at the toe of the gravity dam for 0.10 g - 0.15 g. Although, it seems apparently that smaller dam section may be sufficient for stress analyses using ANSYS 5.4, it would not be possible to achieve the required factors of safety with smaller dam s

摘要：采用多种本构模型分别对300 m级高心墙堆石坝进行三维有限元计算,分析了本构模型、心墙和坝壳的弹性模量对坝体应力变形及拱效应的影响。结果表明,坝体变形及拱效应规律相近且符合一般规律,具有较高的参考价值。

摘要：首先对硅材多线切割过程中应力场进行了理论分析,得出切割力的理论计算公式。基于有限元仿真技术,通过ANSYS软件对硅材多线切割加工区的应力分布和应变进行了仿真,分析了硅材进给速度和钢丝线切割速度对硅材应力分布和应变的影响。

摘要：针对热膨胀系数为混凝土的主要热物理特性参数,亦是其体积稳定性的重要表征参数,基于混合率计算热膨胀系数,分析了热膨胀系数的量化影响及影响因素,通过数值模拟研究了热膨胀系数对混凝土结构温度应力的影响,获得加权平均法可作为热膨胀系数计算之用。结果表明,热膨胀系数对温度应力影响较大,大的热膨胀系数产生较大温度应力,反之则较小。