集中系数

• The second is solving all kinds of disadvantageous influence in space - time dispersing to reduce error , in additional , the problems of load ' s infliction and model ' s size should be considered , in this article , we found the finite element model in allusion to the problem above , solved the equation by the general finite element analysis software ansys , gave some node ' s displacement and stress solution vs . time and the dynamic stress concentration at the edge of cavity , discussed the result
  其次是解决时空离散带来的各种不利影响，以减少误差。还要考虑荷载的施加问题以及模型大小对解题的影响问题。本文对要解决的问题建立了有限元模型，并用通用有限元分析软件ansys进行了计算，给出了部分节点的位移、应力时程解和孔边动应力集中系数，并对结果进行了讨论。
• Abstract : fatigue cracks in ship hull structures are most likely to occur in the highly stressed structural details . the conventional fatigue analysis is largely dependent on the determination of stress concentration factors ( scfs ) at the locations considered . this paper is concerned with the stress concentration of cutout in transverse web for longitudinal stiffener . a series of finite element models is carried out for the stress analysis of predefined structural details . the tabulated scfs of typical cutouts ( abs tanker rules ) in transverse web for longitudinal stiffeners are presented based on the finite element analysis ( fea ) results
  文摘:疲劳裂纹往往发生在船舶结构的局部高应力区,而疲劳分析结果通常取决于任何准确确定结构的应力集中系数.本文研究为铺设纵骨而在舱壁板上开孔的应力集中,采用有限元方法对预先给定的结构进行应力分析,基于有限元计算结果给出了舱壁板典型开孔(参见abs油船规范)的应力集中系数表
• It is important to analyze the stresses and reinforcement design of spherical shell with transnormal nozzle because it is widely used in petroleum > chemicak nuclear electric and other industries . first of all , in order to explore and master the characteristic of stress distribution on this structure and to find reinforcement design which can accommodate to different instances , the stresses of a series of models with different t / t and r / r were analyzed by the finite element procedure - ansys
  首先，为了更进一步了解和掌握球壳超标开孔平齐接管结构的应力分布特点，并找到适用于不同情况下的补强设计方法，本文利用ansys有限元分析计算程序对不同开孔率和不同厚度比的一系列球壳超标开孔平齐接管结构进行了应力分析，得到了应力分布曲线和应力集中系数曲线。
• Secondly the finite element software - ansys , carried out a finite element calculation . the data corresponding former was got out . about the ideal solution of infinite board open pore , both data were compared . a reliable conclusion were drawn the clearly strongly theory gist is afforded for engineering practice
  最后试验结果与有限元软件ansys的计算结果对比分析，结合类似无限大板开孔的理论解，得出了出应力集中系数，得到了比较可靠的结论，为工程实践提供了理论依据。
• Firstly , the analyses on the dynamical response of the tsing ma bridge ( tmb ) under traffic loading are performed on the basis of the three dimensional finite element model of the full - scale structure of the bridge , and some regions critical to fatigue damage are determined from the result of the dynamical response . the hot spot stress approach is usually adopted in the fatigue design and analysis of tubular welded joints . to apply the hot spot stress approach for the fatigue evaluation of long - span suspension bridges , the fem is further used to determine the hot spot stress of the critical fatigue locations
  首先，在青马大桥三维有限元模型和整体动力响应分析计算的基础上进一步进行关键疲劳构件的局部热点应力分析，对疲劳危险部位处的焊接构件建立三维有限元模型，施加符合桥梁实际工况的载荷与位移边界条件，进行局部热点应力分析，确定这些焊接构件内的名义应力和相邻焊接区域内热点应力之间的关系，得到相应的应力集中系数。
• To validate the formulated transition element for the calculation of the hot - spot stress and stress concentration factor in the welded components by experimental results , the stress concentration factor of the experimental welded specimens carried out in the research group is calculated by using the developed plane - transition element . the calculated stress concentration factor in the two types of tested welding components agrees well with that obtained from the experimental result . and the calculated result on the tendency of hot - spot stresses agrees well with that from the measured result
  为了验证文中构造的过渡单元模型用于分析焊接节点附近的应力集中问题的正确性和有效性，进一步又对过渡单元模型进行实验结果验证，采用平面过渡单元模型计算了本课题组进行的两类焊接构件的应力集中系数，并与根据实测方法得到的应力集中系数进行了比较，计算结果与实验测试得到的应力集中系数和相应的热点应力变化趋势比较吻合，为本文建立的过渡单元的实际应用提供了初步的基础。
• Based on ansys , this paper studies stress concentration on single notch of eight kinds of high strength bolts used in grid structure , obtaining their stress concentration coefficients , discussing the effect of ascending angle , bottom radius of screw thread and bolt - ball on stress concentration , introducing their effect coefficients of a1 , a2 , a3 , putting forward the formulae of stress concentration coefficient
  本文以ansys有限元软件为研究手段，针对网架螺栓球节点的8种螺栓规格进行单缺口应力集中分析，定量求得相应的应力集中系数k _ t ；论述了螺纹升角、螺纹牙根圆角半径r及球栓直径比d / d对k _ t的影响，并引入相应的影响系数_ 1 、 _ 2及_ 3 ，最终提出了应力集中系数k的计算公式。
• Therefore , the solution of the problem can be reduced to a seri es of algebraic equations and solved numerically by truncating the finite terms of the infinite algebraic equations . finally , given two kinds of incident wave and different dimensionless parameters , numerical examples are provided to show the influence of wave number , shear modulus , thickness and distance between the center of the cavity and ground surface upon the dynamic stress concentration by incident steady sh - wave
  最后作为算例，给出了第一类和第二类两种不同的sh波入射方式对衬砌的散射，并选取了两种无量纲参数值，得出了圆形衬砌对sh波散射的数值结果，讨论了不同的波数比、弹性模量比、厚度比以及不同的圆形衬砌中心到水平地面距离与衬砌内半径的比值对动应力集中系数的影响。