Non-contact crack opening displacement measuring device for bending fracture test

• Main Authors: YOU ZESHENG, QU SHOUDAO
• Format: Patent
• Language: Chinese; English
• Published: 02.06.2020
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The utility model belongs to the field of material performance tests, and particularly relates to a non-contact crack opening displacement measuring device for a bending fracture test. The device comprises a mechanical experiment machine, the bending test tool comprises an upper pressure head and two lower pressure heads, and a sample is clamped between the upper pressure head and the lower pressure heads; the digital image acquisition system comprises an industrial camera, an imaging lens, an annular LED lighting source arranged at the front end of the imaging lens, a camera support system and a reflector; the reflector is arranged at the lower part of the sample at an inclination angle of 45 degrees, reflects light generated by the light source to the fracture surface of the sample, andreflects a fracture sample surface image into the imaging lens; and the control system is used for displaying images of the industrial camera in real time and calculating real-time crack opening displacement. According to the