【摘要】 本文提出的显微连接二阶云纹中心线的方法,可使错位微分法测定应变场的准确度显著提高,并可判定一般情况下二阶云纹的绝对级数,得出的曲杆试件实验数据表明分散性小,与理论解符合得很好。文中推导了二阶云纹与试件确定点间的应变关系,从而提出了可利用云纹图的重叠区,以测定错开区(不呈现二阶云纹,通常为试件的边界区)应变分布的错位调换法,还论述了在有限错位的情况下确定应变分布时,试件上与二阶云纹的较佳对应点问题。更多还原

【Abstract】 The micro-connection method for determining centre lines of the second-order Moire fringes presented in this paper can enhance the accuracy in measuring strain fields, and can determine the absolute order of the second-order Moire fringes in the general case. The strain data obtained from curved beam experiment agree well with theory. The relationship between the second-order Moire fringe and the strains at the specific points of the specimen is derived. Therefrom a reciprocate shift method is presented for determining strain distributions in the non-overlapping region of the shifted Moire patterns, (usually the boundary region of the specimen where no second-order Moire fringes occur).更多还原