法向应力

In this paper, for a base of a heavy type universal coupling a analysis with finite element method have been done. From here on , the rules of it's stress and deformation have been got.

本文用有限单元法，对大型十字轴式万向接轴的轴承座进行了分析，得出了其应力和变形规律。

Methods Implants with different screw thread angles and shapes were divided into three groups.

方法采用三维有限元法，分别对种植体施加30牛顿垂直和斜向45°两种方向的集中载荷，对不同螺纹顶角螺纹形状分别为对称、上平下斜、上斜下平的种植体-骨界面进行应力分析。

And it is verified that the simulation methods in this paper are rational and the model is feasible.(2)Using the unconditionally stable implicit Newmark time intergration algorithm, the effects of some key factors such as buried depth, condition of soil layers and the earthquake excitative orientation are studied.The results show that dynamic response of structure is considerably affected by the thickness of overburden layer, and horizontal slice is more dangerous than upright slice.

2采用无条件稳定的Newmark隐式积分法进行地震响应分析，讨论各种因素对地下结构动力响应的影响，如：结构埋深、土层分布条件和地震激励方向等，并通过对结构的应力、位移、加速度等结果的分析，发现上覆土层厚度对结构动力响应比较大，水平分层比竖向分层更容易使地下结构遭受破坏。

Applying soil's nonlinear stress-stran relationships (the skelton curve adopts Hadin's hyperbola model and the loaded/unloaded curve adopts the Masing's law revised by Pyke), and taking the viscous boundary as flank artificial boundary, 2D dynamic analysis of the foundation is programed by FEM. It contains an automatic dividing-element subroutine. It could be employed to calculate the horizontal and vertical seismic responses of the soil and foundation.

本文按照土体的非线性应力—应变模式，即将Hadin的双曲线模式作为骨架曲线，加卸荷采用Pyke等修正的广义Masing二倍法则，采用粘性边界作为侧面人工边界，用八结点等参数有限元法在微机上编写了二维地基的动力分析程序，该程序含有网络自动剖分模块，能较好地模似地基和基础在水平方向和竖向的地震反应。

It is pointed that the parabola method is straightforward, but the results are relatively coarse, and the catenaries method is relatively complicated, but the results are precise, which takes into account all-around factors.

结果发现：抛物线法比较简单，但计算结果比较粗略；分段悬链线法考虑因素比较全面，计算相对复杂，但结果比较精确；对于空缆线形竖向坐标值两种方法的误差为0 739%，无应力索长计算两种方法的误差仅为0 31%。

In the present study, through using non-linear three dimensional finite element analysis, considering the contact in flange to nut and flange to gasket, we accurately computed the stress distribution in the flange joint in the normal work condition.

采用ANSYB软件，应用三维有限元技术，考虑了垫片的非线性和法兰和螺母、垫片的接触问题，并且采用了螺栓预紧单元，准确计算出法兰连接在承受内压、轴向力和弯矩外荷载时的应力分布。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。