Study of the effect of load frequency on infrared measurements using thermoelastic FE analysis method

The infrared thermoelastic method is considered a promising technology for the non-contact measurement of stress distribution and fatigue limit structures. In this method, can be detected based on temperature variation caused by loading structure, strength estimated from dissipated energy. Additionally, minute variations structures under cyclic load conditions are evaluated. However, there concern that appropriate results cannot obtained using low-frequency loads owing to large influence heat diffusion. Therefore, effect frequency was investigated finite element (FE) analysis gusset welded joint specimen commonly used in Furthermore, simulate effect, field-temperature field FE technique calculates transfer generated absorption decreasing increasing tensile developed. calculated showed consistency with measured ray implying proposed effective reproducing effect. A small gradient observed case employing 1 Hz; therefore, it important consider when applying concentration field.