varying stress

One method solving parameter estimation of varying stress accelerated life test

一类解决变应力加速寿命试验参数估计的方法

The maximum likelihood function of varying stress accelerated life is a nonlinear multi-dimension complex object function with five evaluated parameters , whose parameter estimation is easy to get into local optimization with grads descending algorithm while has low searching efficiency with global optimal algorithm .

变应力加速寿命试验的极大似然函数是高维非线性复杂目标函数，其待估参数多，采用梯度下降优化方法进行参数估计容易陷入局部极值，而采用全局优化方法又存在寻优效率低的问题。

Analysis of the statistical characteristics of the randomly varying stress in structure

结构的随机应力统计特性分析

And set up calculating formulae on the fatigue life reliability under un varying stress amplitude and varying stress amplitude .

建立了恒幅常应力和恒幅变应力情况下疲劳寿命可靠度的计算公式。

Equi Strength Design of Nonhomogeneous Variable Thickness High Speed Rotating Disk under Steady Temperature Field ON THE FATIGUE LIFE WITH VARYING STRESS AMPLITUDES

在定常温度场中非均匀变厚度高速旋转圆盘的等强度设计变应力幅值下的疲劳寿命问题

The main cause for such failure was the high varying stress from the blade flutter because of its relatively small flutter margins .

叶片颤振裕度不大，在工作转速范围内产生颤振导致叶片承受较大的动应力是其疲劳断裂的主要原因。

It is investigated that the influence of Bauschinger Effect on yield strength of tube body by using four point bending test to simulate the tube making process at varying stress strain amplitudes .

采用X65钢板在四点弯曲加载条件下，模拟输油管制管过程中不同应变量下的应力&应变过程，研究包申格效应对输油管管体屈服强度的影响。

Experimental Research on Infrared Information Varying with Stress

煤岩的红外信息随应力变化的实验研究

CIMMYT is testing yields of genetically engineered plants with the DREB gene under varying water stress .

CIMMYT正在测试不同水分胁迫情况下含有DREB基因的转基因植物的产量。

Nutrition physiological and molecular response of rice seedling to varying inorganic arsenic stress

不同价态无机砷胁迫下水稻秧苗的营养生理与分子响应

By using this method the 1-D nonlinear consolidation behavior of double-layer foundation with varying initial effective stress along the depth under the action of rectangular wave cyclic load is also investigated .

最后在算例分析中，对考虑初始有效应力沿深度变化、矩形波循环荷载下双层地基一维非线性固结进行了探讨。

The electrical conductivity and its specific resistance varying with compressive stress of cement based composite materials ( CBCM ), reinforced by carbon fiber , black lead and steel fiber , were studied .

研究了含有碳纤维、石墨、钢纤维的水泥基材料的导电性及其在压应力作用下电阻率的变化规律；

The main cause of asphalt concrete pavement structure fatigue cracking destroy is the double action by periodic varying of temperature stress and wheel load . The destroy mechanism is the fatigue damage by both repeated actions .

引起沥青混凝土路面结构疲劳开裂破坏的主要原因是周期性变化的路面结构温度应力和行车荷载的双重作用，破坏的机理是由于二者反复作用引起的疲劳损伤。

The 3D-finite element numerical simulation was adopted , and bearing mechanism , loading transfer behavior and varying law of stress and displacement field of squeezed branch pile are reproduced successfully based on results of static loading test .

在试验资料的基础上采用了三维有限元数值仿真技术，再现了新型支盘桩的受力机理、荷载传递性状和荷载作用下应力场及位移场的变化规律。

When uttering spoken English , it is those various invisible prosodic features including varying degrees of stress , pause and pitch on which spoken English mainly depends to realize expressing goals and send emotional signals as well .

具体来说，副语言现象是英语口语中必不可少的一部分，当说英语时，英语语言依赖这些包括不同程度的重音、停顿和音调等音律特征来实现表达目的和发出情感信号。

In order to pre-estimate the residual fatigue strength and fatigue lifespan of metal structures or elements better , the finite element analysis model of fatigue damage must be established to describe the whole varying process of stress field , strain field and damage field .

为了较好地预测金属结构和构件的剩余疲劳强度与疲劳寿命，必须建立疲劳损伤有限元分析模型，来完整描绘其应力场、应变场以及损伤场的变化全过程。

Study on varying rules of casing stress in directional hole with in-situ stress conditions

定向井套管应力随地应力条件的变化规律研究

Seasonal patterns of stomatal resistance were similar for both species under varying degrees of drought stress .

两种植物气孔阻力的季节变化格局在不同水分处理间大体相似。

The results showed that the growth of rape seedling was restrained in varying degrees under alone stress and combined stress .

实验表明，单一胁迫与复合胁迫对油菜幼苗生长有不同程度的抑制作用。

Then through in-situ experiment , the varying characters of pile-soil stress ratio and pile-soil load share ratio are analyzed .

然后通过现场试验，研究桩土应力比、桩土荷载分担比随荷载变化的规律。

Discussed the relationship of strain rate , the varying tendency of flow stress while temperature changing , and the relationship of strain hardening effect , temperature and strain rate in detail .

对该合金流变应力随温度变化趋势与应变速率关系，以及应变强化效应与温度和应变速率关系进行了较为详细的讨论。

Distribution and varying regulation of local stress adjacent to point A was summarized by local stress analysis on the lowest connecting point A of shell where is connected with the support of spherical tank .

通过对球罐支柱与球壳连接最低点a的局部应力分析、讨论，总结出了a点附近局部应力的分布和变化规律。

Through the monitoring of temperature and stress in shaft lining and frozen wall , it is obtained that the varying of temperature field stress field and frost heaving pressure variation and sidewall reinforced concrete force law by freezing construction method sinking construction process . 4 .

结合冻结法施工凿井施工过程，对井壁混凝土施工过程中温度、应力变化进行监测与分析，得到了井壁和冻结壁温度场分布变化规律，冻胀压力变化规律和井壁钢筋混凝土的受力规律。

Applied with incremental theory , this paper has described a new approach for modulus of deformation varying with ratio of stress increment form the K 0 status . On the basis of basis of which , the new ground settlement calculating approach relating to stress path is obtained .

本文以K0状态为计算起点，运用增量理论给出了变形模量随应力增量比变化的计算方法，在此基础上得到了新的考虑应力路径的沉降计算法。