面内云纹方法用于测定平面内的位移、应变分量,各种不同的方法具有不同的特点,可以按不同情况应用不同的方法。平行云纹法:所产生的云纹图形直观、分析全场的应变分布情况比较方便,可以测定最边界点的应力,如孔边应力、受力另件边缘点的最大应力值等;当对称形状的试件受对称载荷时,可以用云纹的对称性来调整基准栅和试件栅的相对位置,保持两组栅线平行。平行云 In-plane moiré method is used to determine the plane displacement, strain components, different methods have different characteristics, according to different situations can be applied to different methods. Parallel moiré method: The moiré pattern produced is intuitive and it is convenient to analyze the strain distribution in the whole field. The stress at the boundary point can be measured, such as the stress at the edge of the hole and the maximum stress value at the edge point of the other component. When the symmetry When the shape of specimen is under symmetrical load, the symmetry of moire can be used to adjust the relative position of the reference grid and the specimen grid, keeping the two grid lines parallel. Parallel clouds