应变速率强化与应变强化的过程及其对比分析

本文用密栅云纹实验法显示和观测了具有应变速率强化效应与应变强化效应材料的应变产生、发展及传播过程,并对两种强化效应传播应变的能力进行了分析比较。     

相位法曲面三维全场无接触检测的研究

采用光学函数分析法和傅里叶频谱分析技术，研究了相位法曲面三维全场无接触检测的基本原理和本质特点。在分析条纹类测量图象的幅频待性的基础上，实现了被测曲面调制栅线图象的精确解相和三维信息的求解，从而建立了计算机曲面三维自动检测系统，并应用于汽车覆盖件的检测，获得较好的测量精度。     

小型高精度角度传感器的设计

本文给出了一种小型高精度光栅角度传感器的设计方法，并就角度传感器的设计要点作了详细分析     

莫尔技术在弹性模量测试中的应用

莫尔三维测量的原理已比较成熟,作为一种新技术已开始在工业生产中应用,介绍了用莫尔法测量压力表C型弹簧管的弹性模量。     

发散光照明幅光栅的莫尔条纹

本文推导了发散光照明幅光栅产生的莫尔条纹方程,并讨论了三种特殊的莫尔条纹轨迹。最后,根据条纹方程讨论影响条纹附加位移的因素及消除方法。     

照射型莫尔轮廓法光强测试

在单光源、双光源、不同照射角及不同距离等条件下,测试了照射型莫尔轮廓法的光强分布。分析了影响光强分布的因素。     

一种基于相移技术的物体表面三维轮廓测量方法

提出一种将阴影莫尔条纹法与相位测量技术相结合的物体表面三维轮廓测量方法 ,该方法利用电磁铁和精密机械部件对光栅进行定位控制以实现精确相移 ,并采用三步相移技术对CCD摄像机采集的物体表面形貌莫尔条纹进行相位解调 ,可有效实现物体表面三维轮廓的高速、高精度自动测量。     

Time‐resolved identification of mechanical loadings on plates using the virtual fields method and deflectometry measurements

This paper describes an approach for identifying the magnitude and location of both stationary and transient mechanical loadings applied to a thin rectangular simply supported plate. Full‐field deflectometry measurements and the virtual fields method are used with the local equilibrium equation of the plate in the time domain to solve the force reconstruction problem, whereas previous work by the authors used this last equation in the frequency domain. As a result, it is possible to reconstruct load time history in addition to magnitude and location. Experimental results of this complete identification are presented for two different instrumented mechanical exciters: electrodynamic shaker and impact hammer for stationary and transient excitations, respectively. The approach is then applied to determine the location and time of multiple unknown transient excitations produced by a set of impacting metal marbles.     

应用三方向光栅、云纹干涉技术测试平面磨削表面的残余应力

磨削过程中所产生的残余应力对零件的使用性能有很大影响。由于残余应力的随机性，理论计算很难确定它的大小和性质。研制出一种有三个方向灵敏度的光栅，并以此为敏感元件，应用云纹干涉技术，结合钻孔法，测试平面磨削表面的残余应力状况。     

A novel two-dimensional method to measure surface shrinkage in cementitious materials

A novel experimental technique, Cure Reference Method (CRM), was developed for the measurement of surface shrinkage in cementitious materials. The technique combines the replication of diffraction grating on a specimen during the curing process and the use of high-sensitivity moiré interferometry. Once demolded, the specimen was stored in an environmental chamber in order to establish specific curing conditions. Measurements were conducted on a daily basis for the duration of 7 days by recording a set of the consecutive phase shifted fringe patterns using the Portable Engineering Moiré interferometer II (PEMI II). An automated fringe analysis system was developed and used to obtain displacement and strain information in two dimenzsions. Surface shrinkage behavior in both cement paste and mortar specimens was investigated by the use of the technique under controlled temperature and humidity conditions. Furthermore, an experimental control was developed in an effort to remove the effects of drying shrinkage on cementitious specimens at early ages. This was done in an effort to explore the relative contribution of autogenous shrinkage to the overall shrinkage in cementitious materials.