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

• Main Authors: YOU ZESHENG, QU SHOUDAO
• Format: Patent
• Language: Chinese; English
• Published: 27.08.2019
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention belongs to the field of material performance test, and especially relates to a non-contact crack opening displacement measuring device and method for a bending fracture test. The non-contact crack opening displacement measuring device comprises a mechanical experimental machine; a bending test tooling including an upper pressing head and two lower pressing heads, and a sample is clamped between the upper pressing head and the lower pressing heads; a digital image acquisition system including an industrial camera, an imaging lens, an annular LED illuminating light source arrangedat the front end of the imaging lens, a camera support system and a reflecting mirror, wherein the reflecting mirror is arranged at the lower part of the sample at an inclined angle of 45 degrees; thereflecting mirror reflects light generated by the light source to a fracture surface of the sample, and meanwhile, a surface image of the fractured sample is reflected into the imaging lens; and a control system for displayin