剪切变形

In this paper, the dynamic compressing experiments for the matrix material of the tungsten alloys which have been three different deforming(0%、 32.6%、 44.6%) processed have been performed by the experimental technology of separated Hopkinson pressure bar and many accurate datum have been obtained. Also the three materials have been compared with each other and analyzed. The results show that the optimized values are in a certain range to optimize the materials by changing their deforming technology. The parameters of constitutive model of Johnson-Cook have been fitted based on the datum. Then proceed to the next step, adiabatic shear band of these three matrix materials has been analyzed with finite element method. The result shows that the relations between stress and strain are different because of the differences of technical process of the three materials, but they are in great commonness in the material experiment and in great coherence in the distribution of time and space, which can been seen from the space distributing figures of plastic strain.

利用分离式Hopkinson压杆实验技术对三种不同变形量(0%、32.6%、44.6%)钨合金基体材料进行动态压缩实验，取得大量精确的数据，对比分析三种材料，结果表明通过改变变形量对材料进行优化，其变形量的优化值是有一定范围的；本论文拟合、确定了钨合金基体材料Johnson-Cook本构模型参数并对三种基体材料绝热剪切带进行有限元分析，结果表明三种材料由于工艺流程的不同，应力应变关系也不尽相同，但从塑性应变的空间分布图上体现了材料很大的共性和时间以及空间分布的一致性。

In this paper,Laterite soil adjacent to some stake of the highway in Chenzhou, Hunan section from Xiamen to Chengdu was used to investigate the deformation characteristics and protection methods of the Laterite soil subgrade under the influence of environment factors.Properties like water-holding capacity,capillary rise, coupled heat-moisture transfer and wetting deformation of samples under different compactness were studied through a series of laboratory tests.In addition,by using meteorological data of two consecutive years in Chenzhou,coupled process of moisture transfer and subgrade deformation was stimulated under the impacts of groundwater and the atmosphere.Specific work done in this paper is as follows:(1) Samples under different compactness were subjected to a series of conventional laboratory tests,such as permeability,consolidation,contraction,shear test and etc.

论文以厦门至成都高速公路湖南郴州段的红粘土为研究对象，以环境因素作用下红粘土路基的变形特征与防护方法为研究目的，通过室内试验研究了不同压实度红粘土的持水性能、毛细上升、湿热耦合迁移及湿化变形等特征，借助郴州地区连续两年的气象数据，模拟在地下水和大气的共同作用下路基内部红粘土水分迁移与路基变形的耦合过程，主要研究内容及结论如下：(1)针对不同压实度的红粘土，系统开展了其渗透、固结、收缩、剪切等试验研究。

Another limitation in the original MSG plasticity theory is the assumption of infinitesimal deformation.

针对原有的 MSG 理论中小变形的假设，但是很多问题，尤其是材料的破坏问题，如断裂、剪切带等问题，都涉及到大变形；另外在微电子器件中，例如微尺度的传感器，在应用中都涉及到大变形，为了使 MSG 理论能应用于以上提到的种种实际工程情况，非常有必要发展大变形理论。

The main achievements could be summarized as follows.1. The basic stress-strain characteristics and related physical mechanisms for sands under cyclic rotation of principal stress axes were investigated based on three kinds of drained tests including fixed principal stress axes, cyclic rotation of principal stress axes with magnitudes of principal stresses kept constant, and cyclic changes of principal stresses in both their axes and magnitudes. The main deformation behavior of sands with inherent anisotropy under cyclic rotation of principal stress axes with magnitudes of principal stresses kept constant was obtained in the following.

本文从试验研究、规律分析、数学建模和工程应用四个方面，对应力主轴循环旋转条件下砂土的变形特性进行了较为深入的研究，取得了如下主要研究成果：(1)基于对饱和砂土进行的主轴固定单调剪切、纯应力主轴循环旋转以及主应力幅值与应力主轴耦合循环变化的三类完全排水试验成果，分析和揭示了应力主轴循环旋转条件下砂土的基本变形规律，并探讨了其受力变形的内在机理。

This paper analyses the feature of the bearing capacity and settlement of large diameter belled piles and pointed out that such piles should be designed according to the foundation settlement .

试验研究和数值分析［1，2］表明，大直径扩底桩桩端以下的地基变形和破坏模式既不同于扩展式浅基础的整体剪切破坏，也不同于常见桩基础的刺入破坏或深层剪切破坏。

According to Coulomb-Mohr theory about plastic deformation and breakage of viscous or nonviscous friction material, the simulating experiment set to simulate fault smear is designed and installed, after sandstone and mudstone layers of varied thickness and diagenetic stage are sculptured with slay, sand and cement, a lot of experiment is done by the set.

摘 要：根据库仑-摩尔黏性或非黏性摩擦材料的塑性变形和破坏理论，制作了剪切模拟实验装置，以黏土、砂、水泥等作为不同厚度、不同成岩程度的砂泥岩地层的替代物，进行了大量断层涂抹层形成的剪切断裂实验。

To establish a HPLC method for the determination of chlortetracycline hydrochloride in stomatic ulcer paste.

对剪切带的变形特征及剪切带-带外弹性体系统的失稳判据进行了分析。9。建立HPLC法测定口腔溃疡糊剂中盐酸金霉素含量。

In this modified model, the effect of the stress concentration on the end stress in the fiber end region is considered, the average matrix strain is used to substitute for the so-called far field strain in the previous shear lag model. The change of the deformation states from elasticity to plasticity is considered and the interfacial shear stress and fiber axial stress are derived.

修正的模型合理考虑了纤维根区域应力集中对根应力的影响；用基体平均应变代替了经典剪切滞后模型中的远场应变；考虑了基体变形状态从弹性到塑性的变化，给出了塑性区上的表面剪切应力和纤维轴向应力的表达式。

It has been observed that a general strain fail criterion for clay is recommended for considering the integrative effects of torsional shear strain and normal deviatoric strain as well as cyclic strain and accumulative strain.

提出的综合应变式同时考虑了剪切变化和正向偏差变形的共同效应，适合作为主应力连续旋转的耦合循环剪切试验的破坏标准。

The relationships between strain and stress of several kinds of high strength fibers, such as Kevlar, Twaron and Dyneema were obtained, and the dependence of mechanical properties of fibers on the strain rate was gotten and explained from the microstructures and deformation mechanism of fibers. Then, the damage and failures of plates with the reinforcement of fibers under high velocity impacting were studied experimentally. Based on experimental results, a set of equations was presented to depicted the deceleration of penetrator. The dynamic response of fiber cluster and sandwich were simulated successfully with a new algorithm and code, which was developped by our group. The coupling effect of stress wave and thermal conduction could be considered with acceptable accuracy and CPU time.

其中，获得了以芳纶纤维为代表的7种纤维的动态应力应变关系，从材料微观机制解释了纤维束的应变率相关特征；得到了板材在高速冲击下的能量吸收机理，以及影响能量吸收机制转变的主要因素；发展了一种新型的原位光学测试技术，以之可以测量试件在冲击加载下的变形场及其演化，该技术除了在本项目应用外，还可以对剪切带的萌生演化、孔洞动态扩张规律进行较好的观察，以弥补相关研究中实验证据的缺乏；发展了含热传导的冲击动力学有限元程序，在侵彻、绝热剪切带、脉冲激光诱导结构破坏等问题的分析中得到了较好的应用。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。