A method for detecting the pretightening force of high-strength bolts
A technology of high-strength bolts and detection methods, applied in force/torque/work measuring instruments, measuring torque/torsional force during tightening, measuring devices, etc., can solve problems such as difficulty in use, wave speed error, etc. The effect of stable excitation frequency and stable measurement results
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[0031] The present invention will be further specifically described below in conjunction with the accompanying drawings and embodiments.
[0032] See Figure 1~ Figure 8 , the detection method of high-strength bolt preload provided by the invention specifically comprises the following steps:
[0033] (1) Select a model with a bolt diameter of 16mm, according to the actual situation of high-strength bolts in steel structure engineering (such as Figure 1a Shown) Set the elastic modulus (Ε), density (ρ), Poisson's ratio (μ) of the relevant material, and establish high-strength bolts at different preloads in COMSOL Multiphysics (that is, the preload reaches the high-strength bolt 0, 10%, 20%, 30%, 40%, 50%, 60%, 70% of the tensile strength design value) when the finite element model, using material parameters as shown in Table 1:
[0034] Table 1
[0035] Elastic modulus (GPa) Density(kg / m3) Poisson's ratio steel plate 200 7850 0.3 bolt 209 7850 ...
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