盲孔法测量精度的研究─—边界及孔间距的影响

本文根据弹性这柯西解及三维弹性有限元分析，对通孔及盲孔测量时，边界与孔中心距离和孔与孔间距问题进行了研究讨论，得到边界及孔间距是在一定范围内有影响的，孔与孔之间的影响与载荷方向有关，并且通过实验对其进行了验证。由此确定了误差小于２％－３％的横向最小间距ｄｉｍｉｎ（垂直国荷），纵向最小距ｄｘｍｉｎ（平行于载荷方向）和孔与边界的最小距离ｄｍｉｎ。为盲孔测量获得比较可靠而又完整的应力数值提供了依据。

Effect of boundary and distance between holes on accuracy of blind hole technique

In present paper,the effect of distance from boundary to hole center and hole to hole on the accuracy of blind-hole technique are discussed on the basis of Kirsch elastic solusion and solusion of 3D.F.E. calculation.Analysis shows that the boundary and distance between holes have effects to a certain content and moreover the effect of distanee between holes is related to direction of loading.Experiments verifred the obtained analytical conclusions. Finally,the transverse and longitudinal minimum distance between noles d_min and d_min and the minimum distance from hole to boundary d_min are detemined. It provides necessary basis for obtaining accurate and reliable stress value with blind-hole method.