关键词: 盲孔, 通孔, 小孔法, 校准系数, 有限元

Abstract: The experimental calibration procedure of calibration constants and in the hole-drilling method are complicated, as well as the recommended values in ASTM E837-08 have some limitations in practical measurements. Finite element (FE) numerical analysis method is used to simulate the calibration process of mechanical tensile test, and the calibration coefficients of Type A strain rosette with a centre diameter of 5.13 mm are calibrated. A 3D model of bonding of specimen and rosette is built by means of ANSYS, and drilling through-hole in the thin specimen and drilling blind hole in the thick specimen respectively are investigated. Furthermore, the influences of the side length of specimen patch plane, the specimen thickness, the hole diameter, and the drilling depth on and are analyzed. Finally, the obtained calibration data are compared with the recommended values of ASTM E837-08. The results show that the hole diameter is a key influencing factor in drilling through-hole on the thin specimen. However, the hole diameter and drilling depth are two major influencing factors in drilling blind hole on the thick specimen. In addition, their influences on and have certain regularity. The calibration coefficients obtained from FE numerical analysis method are accurate, reliable, and in good agreement with the recommended values of ASTM E837-08, and its value is fully extended. The FE numerical calibration method is efficient and effective, which can replace the complex mechanical tensile calibration.

Key words: Blind hole, Calibration coefficients, Finite element, Hole-drilling method, Through hole