Continuous Shear Deformation Of Pure Copper Plate Experimental Study

Refined grain materials (include the submicron grain with the nanometer grain) because of a physics for very thinly, organizing the atom of inside large quantity being placed on a semi-stable the boundary of grain between grain and grain or on small angle the boundary of grain in construction of submicron grain, as a result expressing an a series not usually with mechanics function. The method of confined strip shearing process is a kind of passing violent shearing to slice to transform to plank material infliction big adapting to changes with refinement its internal grain a size, excellent turn its internal construction for making the material acquire the more excellent machine function to process the method of a kind of all new material acquire the more excellent machine function with the other special function to process the method of a kind of all new material. It is one of the valid methods of the grain refinement.With the aid of finite element analysis software MAFAP4.0simulation the continuous confined strip shearing process, analyzes the deformation of the sample inhomogeneity and channel Angle φ, outer arc Angle ψinternal stress of specimen size and the influence law of distribution.Stress distribution is not uniform led to the specimen deformation process of the non-uniform deformation; A sample of the middle and top exists a uniform, stable deformation area; In the mold the corner the equivalent strain layer distribution and variation gradient is very big, this and deformation is shear deformation is very consistent. Each time the equivalent strain value produced with Φ Angle increases and decreases, and the simulation results with the theoretical calculation results. In the continuous confined strip shearing process the general won’t appear obvious "dead zone" phenomenon, each time accumulated equivalent strain value with Ψ Angle is decreased, the suitable choice Ψ can reduce machining difficulty at the same time in the internal got bigger and uniform equivalent strain.The adoption confined strip shearing process legal system had the submicron grain copper (T2) plank, proceeding the design, experiment of the design molding tool of the device study, adopting red copper with rolling condition for a die the channel angle φ=120°device to start experiment. Combine proceeding the experiment, pulls to stretch the experiment, degree of hardness experiment mutually, to experiment result proceed discussion with analyze. The experimental results show that, the empress of confined strip shearing process internal grain in material in plank is obvious about refinement. Degree of hardness has been strengthened with process time increasing. Degree of hardness is the most strong when process is eight time. But degree of hardness weaken when process time increase continuously.