便携式应力环校准装置

Portable calibration device for proof ring

为了满足应用于应力腐蚀开裂试验的应力环的现场校准需求,研制了一种便携式应力环校准装置。根据应力环校准过程中载荷力加载范围和加载速率以及试验次数的要求,设计了一台小型载荷加载装置,该装置可以实现最大30 kN的载荷力。同时,根据应力环的结构以及变形测量准确度要求,以CCD相机为测量元件,设计了一套基于数字图像技术的非接触式变形测量系统,用于测量应力环变形。实验证明,研制的校准装置力值测量最大误差为-0.04%,变形测量最大误差为-0.002 mm。

In this paper,a portable calibration device for proof ring used in stress corrosion cracking experiment is developed to realize site calibration.A small-sized loading device(maximum loading:30 kN)is designed according to the measuring range and loading rate for calibration.The deformation measurement device is established based on non-contact charge coupled device to improve the accuracy.The calibration device was verified at laboratory that the maximum error of force measurement is-0.04%and the error of deformation measurement is-0.002 mm.