光弹性测量等色线计算机数字图像色谱仿真

Chromatogram Simulation by Computer Digital Image for Photoelastic Isochromatics

应用平面应力-光学定理,计算各点的光程差;应用色彩的RGB原理以及光程差和RGB之间的换算关系,将每个点的光程差换算成RGB值;利用等色线原理,采用VB编写程序,将具有相同RGB值的点按不同的色谱绘出等色线,实现了在载荷作用下光弹性测量等色线计算机数字图像色谱仿真,虚拟再现构件光弹性实验所得到的等色线。对复杂结构,特别是内部存在各种构造孔洞的构件,通过该技术可迅速获得构件全场等色线的分布,为进行结构设计和优化的光弹性实验提供了一种直观的数字化可视技术,同时为高等院校实验力学课程提供了一个虚拟的光弹性实验平台。

Theorem of plane stress-optical was used to calculate the optical path difference of each point. Then each point＇s optical path difference was conversed into RGB value by applying the RGB principle as well as the conversion between the optical path difference and RGB. According to the principle of isochromatics and VB programming, the isochromatics were drawn based on the points with the same value of RGB, which have different chromatogram. Thus, the chromatogram simulation was realized by computer digital image for photoelastic isochromatics under loads and the isochromatics obtained by photoelastic experiment is virtually representated. For complex structures, especially such as a component with a variety of structural holes, this technology will help to obtain the isochromatics distribution in the component rapidly. This result may provide a direct digital video technology for the photoelastic experiment in structural design and optimization. Furthermore, it may provide a virtual platform for the photoelastic experiment of experimental mechanics course in colleges and universities.