stress matrix

The flow stress was evaluated the average dislocation density of the matrix and all the R-grains.

流变应力的大小可由基体与再结晶晶粒位错密度的平均值计算.

The Precision Measure and the Criterion Matrix of Three-Dimensional Stress Parameters for Monitoring Networks

监测网的精度测度与三维应变参数的准则矩阵

Using the concept of plastic hinge, the tangent stiffness matrix of spatial beam element is formed. At the same time the effect of geometry nonlinear property, residual stress and end restraint are considered.

引入塑性铰的概念，建立了空间梁单元弹塑性刚度矩阵，同时考虑几何非线性、残余应力、端部约束等的影响，给出了一套钢结构复杂体系的有限元计算方法。

At the same time, from the basic theory of mechanics of materials, particularly expatiate the material secant stiffness of the principal strain direction and the principal stress direction and the element transformation matrix; they provide the theory basis of the procedure presented in this paper.

同时由材料力学出发详细推导了主应变或者主应力方向上的材料割线刚度、单元坐标转换矩阵，为本文程序的编制提供了理论基础。

In this paper, the element tangent stiffness matrix of spatial fold cable element under initial stress condition and nonlinear simultaneous equations for finite element method which can be used in nonlinear analysis and calculation of prestressed lattice structures are developed by studying the prestressed cable element.

通过对于预应力索单元的分析研究，推导了具有初始应力的空间折索单元的单元切线刚度矩阵的计算公式，并且建立了可用于预应力空间网格结构非线性有限元分析的非线性方程组。

The traditional shear lag theory of stress transfer in short fiber reinforced metal matrix composites was modified and improved.

对短纤维增强金属基复合材料应力传递的传统剪滞理论进行了修正和改进。

Relationships between equilibrium matrix and tangent stiffness matrix, linear stiffness matrix, initial stress stiffness matrix are discussed.

与几何非线性有限元法进行了比较，深入阐述平衡矩阵与切线刚度矩阵、线性刚度矩阵、初始应力矩阵的联系，指出了该方法进行动不定结构分析的优越性。

The whole tension strength of steel fiber reinforced self-stressing concrete is a combination of tension strength of matrix and the self-stress value;

钢纤维自应力混凝土抗拉强度为混凝土基体的抗拉强度与自应力值之和；

The predicted fracture stress matrix cracking stress and crack spacing just have error less than 20% with the corresponding experimental value.

预测的断裂应力、基体开裂应力和裂纹间距与实测值最大误差在20%以内。