高温光栅应变法的研究

光栅应变法以高频反射式正交衍射光栅为传感器，通过考查光栅衍射图案的变化来确定试件被测点的全部面内应变分量的刚体转角。这种方法具有无机械接触、不需暗室、防震要求低、灵敏度可调以及易于实现数据采集与处理过程自动化等优点。文中对光栅应变法进行了新的分析，推导出物理意义明确、精度更高的计算公式，并首次将光栅应变法成功地应用于高温下的应变测量。     

APPLICATION OF GRATING DIFFRACTION IN STRAIN MEASUREMENT

In this paper a new technique for measuring strain is presented.Usinggrating as the strain sensor,we can obtain strain and stress components by measuringthe deformation of the space position of diffraction spots.The cost of the hologra hicgrating by embossing is much reduced.By using the video and computer techniques thestrain and stress Values can be obtained automatically.     

温度场中应变光纤测试方法

研究温度变化时光纤应变测试系统中的传输光纤和感应光纤产生附加相位的问题推导出附加相位与温度变化的关系式，提出消除附加相位的补偿法通过实验分析证明了补偿法对消除附加相位是行之有效的，提高了测试精度     

冲击压缩下稠密Ar等离子体温度测量

测量了稠密氩等离子体温度,并与国外文献报道结果进行了对比。实验时通过对Ａｒ气冲击压缩产生稠密Ａｒ等离子体。Ａｒ样品的初始压力均为０．１ＭＰａ,初始温度为２９３Ｋ。五个实验点的压力为０．１２５～０．１６３ＧＰａ,温度为２３４００～２５９００Ｋ,等离子体非理想性参数为０．４３～０．４５。给出了Ａｒ的Ｈｕｇｏｎｉｏｔ冲击压缩数据及温度实测数据。理论计算首次考虑了二级电离效应,温度理论计算值明显地偏高于实验值,这说明用Ｓａｈａ加上Ｄｅｂｙｅ Ｈｕｃｋｅｌ修正模型的计算电离度已与实际结果出现了差别,其电离能和能级布居也发生了改变。     

PLASTIC BEHAVIOR AND CONSTITUTIVE MODELING OF ARMOR STEEL OVER WIDE TEMPERATURE AND STRAIN RATE RANGES

Plastic behavior of 603 armor steel is studied at strain rates ranging from 0.001 s-1 to 4500 s-1 , and temperature from 288 K to 873 K. Emphasis is placed on the effects of temperature, strain rate, and plastic strain on flow stress. Based on experimental results, the JC and the KHL models are used to simulate flow stress of this material. By comparing the model prediction and the experimental results of strain rate jump tests, the KHL model is shown to have a better prediction of plastic behavior under complex loading conditions for this material, especially in the dynamic region.