![]() ![]() Horizontal force along x 2 direction at point G F Gz2 ![]() Vertical force along z 2 direction at point F F Gx2 Horizontal force along x 2 direction at point F F Fz2 Torque along x 2 direction at point K M Kz2īending moment along z 2 direction at point K F Fx2 Lateral force along y 2 direction at point K M Kx2 Vertical force along z 2 direction at point K F Ky2 Horizontal force along x 2 direction at point K F Kz2 Strain along the 0° directions of the i-th strain rosette EĬoefficient related to the ratio h/b F Kx2 Strain along the 45° directions of the i-th strain rosette ε i-90°: Strain along the 0° directions of the i-th strain rosette ε i-45°: The stress-load coefficient matrix of the cross-section k j Static moment of the section on one side of the z-axis to the z-axis N Static moment of the section on one side of the y-axis to the y-axis S z*: Sum of the widths of the webs at i-th measuring point S y*: Wall thickness at i-th measuring point C i 2 measuring point to z-axis z 3ĭistance from no. 1 measuring point to z-axis y 2ĭistance from no. Inertia moment of the whole cross-section to the y-axis y 1ĭistance from no. ![]() Inertia moment of the whole cross-section to the z-axis I y Normal stress at i-th measuring point T iĪrea enclosed by the midline in the thickness direction of each plate of the cross-section I z The field test results showed that the new method could be conveniently applied with high identification accuracy for complicated actual loads. The maximum deviation between the actual damage of each selected measuring point and the damage caused by the identified hinge joint loads was only 1.69 %. The hinge joint loads deduced from the stick’s six-component cross-section loads identified by the new method were compared with the values calculated by traditional method, and the recurrence degree of stress and fatigue cumulative damage of the stick’s fatigue critical points were also compared. Numerical simulation of a cantilever beam and an industrial case study, i.e., identification of hinge joint loads on excavator working device under actual excavating condition, are presented to demonstrate the practicability of the proposed method for industrial scale problems. A new strain gauge layout method on the structural surface is proposed to identify the six-component loads in cross-section. ![]()
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