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The flowstress curves are found to include both a workhardening region and a worksoftening region.


In both reinforced and unreinforced materials, the naturally aged conditions were cyclically unstable, exhibiting an initial hardening behavior followed by an extended region of cyclic stability and ultimately a softening region.


A Ludwig equation was modified to model the stressstrain behavior at a reference strain rate, which included elastic deformation, a yieldlike peak, and a strainsoftening region.


A softening momentcurvature relation is assumed for the beam and a closed form solution is obtained for a special kind of load, which shows that there exists a softening region in the beam and this region propagates along the beam.


In other instances, the studs could go into tension membrane after a welldefined softening region after the yieldbuckling is achieved.

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 Tracing procedure modeling is the basis of the strategy of instability analysis and results in correctness and precision of the solution. In this paper after having reviewed the basic concepts and studied the modeling for instability analysis of single layer reticulated shells,the authors present some concepts of softening region in a structure and critical stress. The determination of softening region and definition of critical stress are stipulated and the technology for tracing buckling path on... Tracing procedure modeling is the basis of the strategy of instability analysis and results in correctness and precision of the solution. In this paper after having reviewed the basic concepts and studied the modeling for instability analysis of single layer reticulated shells,the authors present some concepts of softening region in a structure and critical stress. The determination of softening region and definition of critical stress are stipulated and the technology for tracing buckling path on analysis of mechanism displacement is provided as well.  本文主要研究了网壳结构的稳定分析的建模基础,因为建模基础决定了稳定分析的策略,也决定了稳定分析的正确性和精度。文中在回顾了基本概念的基础上提出了软化区、临界应力的概念和基于机构位移分析的屈曲路线跟踪技术,并给出了软化区的判断原则和临界应力的定义以及平衡路线、屈曲路线跟踪过程和技术。本文所提出的理论和方法可作为稳定分析的应用基础。  Under undrained conditions,the phenomena of strain softening occur when the loess taken from northern France is subjected to monotonic loading,while liquefaction or cyclic mobility phenomenon is observed under cyclic loading.The bounding surface model and the generalized plasticity model are used to predict this behaviour.It is shown that the accumulated rate of plastic strain under cyclic loading is slower than that in softening region under monotonic loading.The sensitivity of model parameters is discussed;and... Under undrained conditions,the phenomena of strain softening occur when the loess taken from northern France is subjected to monotonic loading,while liquefaction or cyclic mobility phenomenon is observed under cyclic loading.The bounding surface model and the generalized plasticity model are used to predict this behaviour.It is shown that the accumulated rate of plastic strain under cyclic loading is slower than that in softening region under monotonic loading.The sensitivity of model parameters is discussed;and it is concluded that both the bounding surface model and the generalized plasticity model can describe the loess liquefaction satisfactorily,provided that appropriate parameters are defined.  在不排水的条件下,黄土在单调荷载下会出现软化,在循环荷载下会出现液化(或循环移动)。对此给出了试验结果,并尝试用边界面及广义塑性模型来预测黄土的软化及液化现象。结果表明:循环荷载下塑性应变累积速度要比单调荷载下软化阶段塑性应变累积速度慢,广义塑性模型可较好地预测黄土软化、液化现象。讨论并分析了模型参数对预测结果的影响。  In this paper,a comparative study on undrained monotonic and cyclic shear behavior of saturated loose sand under complex stress condition is made on the basis of experimental test by using the soil static and dynamic universal triaxial and torsional shear apparatus established in Dalian University of Technology.The different combinations of initial consolidation stress condition and monotonic or cyclic shear stress patterns are considered in the soil tests.It is shown through comparison that the strainsoftening... In this paper,a comparative study on undrained monotonic and cyclic shear behavior of saturated loose sand under complex stress condition is made on the basis of experimental test by using the soil static and dynamic universal triaxial and torsional shear apparatus established in Dalian University of Technology.The different combinations of initial consolidation stress condition and monotonic or cyclic shear stress patterns are considered in the soil tests.It is shown through comparison that the strainsoftening or hardening characteristics are closely associated with the deformation features of flowslide deformation and the cyclic mobility of loose sands.Once the cyclic stress enters the strainsoftening region given by monotonic shear loading,the flowslide deformation will occur.In both monotonic and cyclic shear loading,the effective deviator stress ratio attained at the steady state reduces gradually with the increase of the orientation angle of major principal stress with respect to the vertical direction.Under the condition with the same coefficient of initial intermediate principal stress,the effective deviatoric stress ratio at which a remarkable shear dilation occurs and the effective deviatoric stress ratio peak at which a final steady state is formed in cyclic shear loading are respectively almost same as the effective deviatoric stress ratio at the arrival of phase transformation state and the finally attained steady effective deviatoric stress ratio.However,the behavior of generation and buildup of porewater pressure is completely different in monotonic and cyclic shear loading.With the increase of the direction angle of initial principal stress,the maximum pore water pressure generated in the cyclic shear reduces gradually while the maximum pore water pressure caused by monotonic shear loading test increases gradually.  本文利用大连理工大学新引进与开发的“土工静力动力液压三轴扭转多功能剪切仪”,针对福建标准砂,在不排水条件下同时进行了单调剪切试验与循环剪切试验,进而对其进行了对比分析。通过比较表明,应力应变关系的应变软化和硬化特性与流滑变形和循环流动特性密切相关,当循环剪切应力水平高于单调剪切过程中应变软化阶段最小强度时将会发生流滑变形。无论在单调剪切中,还是在循环剪切中,稳定状态时的有效偏应力比随着大主应力方向与竖向之间夹角的增大而减小,在中主应力系数相同的条件下,循环剪切中呈现显著剪胀时的有效偏应力比和最终稳定状态时的有效偏应力比峰值分别与单调剪切中达到相变状态时的有效偏应力比和最终稳定有效偏应力比基本上一致。然而不排水条件下单调与循环剪切过程中孔隙水压力的增长特性却并不相同,循环剪切中的最大孔隙水压力随着初始主应力方向角的增大而减小,单调剪切中的最大孔隙水压力却随着主应力方向角的增大而增大。   << 更多相关文摘 
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