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对各向异性、非均质的复合材料,由于理论分析上的困难,利用实验应力分析的方法测定其应力应变分布,比均质材料更为重要。 云纹法的基本原理是利用两个栅片之间的干涉得出云纹图。其中一块栅片贴到试件上,跟随试体一起变形,这块栅称为试件栅。另一块印制在透明材料上,它不随试件变形,称为分析栅或基准栅。变形后的试件栅和分析栅重叠在一起相干涉,得到的图形叫云纹图。云纹
For anisotropic and heterogeneous composite materials, due to the difficulties in theoretical analysis, the stress-strain distribution is determined by experimental stress analysis, which is more important than homogeneous materials. The basic principle of the moiré method is to use the interference between the two grids to get the moiré pattern. One of the grids is attached to the test piece and deformed along with the test piece. This piece of grid is called the test piece grid. The other is printed on a transparent material that does not deform with the specimen, called the analytical grid or the reference grid. The deformed specimen grid and the analysis grid overlap and interfere with each other to obtain a pattern called a moiré pattern. Moire