[This article belongs to Volume - 54, Issue - 02]
Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-09-12-2022-35

Title : EVALUATION OF THE STRAIN RATE AND THE DEVELOPMENT OF THE DIE CORNER GAP IN EQUAL CHANNEL ANGULAR PRESSING: AN OVERVIEW
Nagendra Singh1, Manoj Kumar Agrawal2, Sanjeev Kumar Verma3, Rajhans3 Ashish Kumar Tiwari4

Abstract :

The constitutive behaviour of rate-sensitive materials, the flow stress evolution and dislocation density, the generation of deformation heat, and other aspects of plastic deformation are all influenced by strain rate. A geometric method was used to assess the workpiece material strain rate during ECAP. The outcomes were contrasted with those of finite element studies performed on a model made of perfect plastic with different sizes of mesh. The obtained formula for the strain rate agrees with the finite element method's findings in a fair amount of detail. When using ECAP, the strain rate rises with falls with die channel angle, die corner angle, and workpiece and width punch speed . For analytical calculations of the distortion, thermal, and behaviour of material microstructural development during ECAP, the relationship derived can be applied. During ECAP process of materials, a die inner corner gap is typically discovered. It was determined how the corner gap development and deformation behaviour of the strain-hardening material and the nearly perfect plastic material. The strain hardening behaviour and the workpiece regional flow velocity in the deforming zone, the mechanism of corner gap generation is discussed. To more accurately predict the tension during ECAP, from the die corner angle to the workpiece arc curvature, the corner angle must be changed.