FIELD: measuring equipment.
SUBSTANCE: invention relates to measurement equipment. Disclosed is a method for thermography of articles made from polymer composite materials, which involves loading the article, recording the temperature field formed on the surface as a result of internal thermomechanical processes, and detection of internal defects based on analysis of temperature field. Critical units with increased probability of destruction at application of load are determined in the article. In the process of product manufacture, a fiber-optic line with deformation sensors, which are fiber Bragg gratings, is laid in it so that deformation sensors are located in critical assemblies. Before the force action, the limit permissible deformation in the critical units of the article is determined. Prior to force action, electric current is passed through the article until it is heated. Electric current value is adjusted so that the article temperature does not exceed the allowable value. Temperature field of the surface is recorded and the magnitude and coordinates of its abnormal areas are measured. Deformation value is measured in critical nodes. By comparing values of maximum permissible load and value of deformation in critical units, possibility of further increasing mechanical load on article is determined. After termination of increase in mechanical load, product surface temperature field is registered. Difference of two thermograms of the surface of the article before and after application of the mechanical load is used to determine the presence of internal excess stresses and defects. Device for the method’s implementation has been described.
EFFECT: high reliability of detecting local areas.
2 cl, 16 dwg
