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高性能军用飞机常因机翼主梁螺栓孔内疲劳裂纹而引起断裂,主梁断裂的临界裂纹尺寸很小,用内窥镜、涡流方法检查无效。因此,螺栓孔内早期疲劳裂纹的检测成为无损检测领域的一个难题。钢件疲劳裂纹最佳检测方法首推磁粉探伤,但它用肉眼观察,对于视力不可达的孔壁等部位,则受到限制。70年代初,美国通用动力公司H.J.Weltman和J.E.Halkias等人为检测孔内疲劳裂纹,发明了磁橡胶探伤法(MRI),它是将硅橡胶技术移植到无损检测领域中的产物。1 磁橡胶法(MRI)MRI是将磁粉弥散于室温硫化硅橡胶中,加入固化剂后倒入被检孔中,在磁场作用下,磁粉在橡胶液中迁移并聚集在有裂纹的部位,形成裂纹的磁痕,橡胶固化后取出,即获得一个重现裂纹的橡胶复制件,在强光下观察,可将缺陷检测出来。该法为孔壁探伤开辟了新途径,被视为无损检测领域中的一项突破。室温硫化硅橡胶,化学名称为聚二甲基硅氧烷,为
High-performance military aircraft often due to fatigue cracks in the main beam bolt hole caused rupture, the main beam fracture critical crack size is very small, endoscopy, eddy current method to check invalid. Therefore, the early detection of fatigue cracks in the bolt hole has become a problem in the field of non-destructive testing. The best detection method for the fatigue crack of steel parts devaluates the magnetic particle inspection, but it is observed with the naked eye, and the hole wall and other parts that are not accessible to eyesight are limited. Early 70s, the United States General Dynamics H.J.Weltman and J.E.Halkias and others to detect fatigue cracks in the hole, invented the magnetic rubber detection method (MRI), which is the silicone rubber technology to the field of nondestructive testing products. 1 Magnetic MRI (MRI) MRI is the dispersion of magnetic powder in room temperature vulcanized silicone rubber, adding curing agent and then into the hole under test, under the action of the magnetic field, the magnetic powder in the rubber liquid migration and aggregation in the crack site, the formation of The magnetic marks of the crack, removed after the rubber has been cured, obtain a replica of the rubber that reproduces the crack, which can be detected under strong light. The method opens up new avenues for hole wall inspection and is considered as a breakthrough in the field of nondestructive testing. Room temperature vulcanized silicone rubber, chemical name for the polydimethylsiloxane