Common fracture types of tile press
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The common fracture types of tile pressing machine are ductile fracture, brittle fracture, fatigue fracture and environmental fracture. 1. Tough fracture The fracture caused by ductile deformation when the stress value exceeds the strength limit of the part when a large external force is applied, is called ductile fracture. It usually occurs under the action of shear stress, so it is also called shear fracture or ductile fracture. The remarkable feature of ductile fracture is that there is obvious plastic deformation in the stress area before the fracture of the part. Its macro form is necking, for example, when the finished steel is sheared, the edge appears shear lip - plastic deformation of the edge in the shape of a duckling's beak, and the color of the fracture is dark, in the shape of a cup cone. The microscopic feature is that the cross section is covered by a large number of micro pits (also called dimples). 2. Brittle fracture Brittle fracture is a kind of fracture with no obvious plastic deformation and rapid development speed of parts. It usually happens suddenly without any indication signal and is a very dangerous fracture. The probability of such fracture is small, but it is easy to cause serious damage accidents. Brittle fracture generally occurs before the stress reaches the yield strength of the colored steel tile mechanical equipment material. There is no or only a small amount of plastic deformation on the surface of the colored steel tile mechanical equipment (this depends on the site conditions and the specific size of the parts). The micro mechanism of brittle fracture is that after the weak part is stressed, micro cracks (called grain boundary fracture) will be generated along the grain boundary. This kind of microcrack has a fast growth rate, which is easy to cause the overall fracture of the colored steel tile mechanical equipment. The fracture surface of brittle fracture is crystalline, often showing herringbone pattern or radial pattern, and some areas are bright and smooth. This kind of fracture is easy to occur in low temperature environment, impact conditions and the use of brittle materials. For example, the fracture accident occurred at the eccentric shaft (crankshaft) of shears and punches in the workshop during winter production. 3. Fatigue fracture Fatigue fracture refers to the fracture phenomenon of colored steel tile mechanical equipment under the long-term action of repeated and alternating loads, that is, under the action of alternating stress. This is a common and serious failure form. Even under the safety condition that the colored steel tile mechanical equipment according to the static strength standard can achieve full force, fatigue fracture may still occur. Fatigue fracture accounts for more than 80% of the total fracture accidents, which should be paid attention to. Whether the colored steel tile mechanical equipment is brittle material or ductile material, the macro form of fatigue fracture is brittle fracture. Fatigue fracture can be divided into contact, torsion, bending, vibration and other fatigue formation types. The characteristic of fatigue fracture is that the stress value of the part under fracture is lower than the tensile strength or yield strength of the part material. 4. Environmental fracture Environmental fracture refers to the fracture form with certain environmental characteristics caused by the interaction between colored steel tile mechanical equipment materials and a special environment. The so-called special environment refers to the temperature, chemical corrosion and other environmental conditions in the working environment of operating equipment. Such environmental conditions will cause the strength of parts and components materials to decline day by day. Especially in the corrosive environment, the strength of the material surface decreases due to oxidation, corrosion or other processes, and fracture occurs. Common environmental fractures include stress corrosion fracture, hydrogen embrittlement fracture, high-temperature creep fracture, corrosion fracture, corrosion fatigue fracture and cold brittle fracture. Pay attention to Yufa Tile Press Factory and learn more about tile press equipment. www.hbyfjx.com
