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- Title
MECHANICAL ANALYSIS AND RESEARCH OF LARGE-DIAMETER SOLID EXPANSION PIPE.
- Authors
Gou Yanan; Ning Tingzhou
- Abstract
In order to study the mechanical behavior of large-diameter solid expansion pipe in forming process, the finite element model for the expansion pipe in forming process was established, the forming process of casing was simulated and analyzed under different working conditions, the following conclusions were drawn: (1) When the cone angle was certain and the expansion cone began to move down, the casing was expanded and the stress increased with the time increase. When the expansion cone completely penetrated the whole casing, the maximum stress of the casing decreased and remained the residual stress only; (2) At the beginning of expansion, the required expansion force increased rapidly. When the sizing area of the expansion cone was squeezed into the casing, the required minimum expansion force reached the maximum; (3) In the expansion process, the better the lubricity of the expansion pipe was, the smaller the liquid pressure needed in the expansion process was, and the easier the expansion construction was; (4) Under different expansion cone angles, the expansion cone angle with the minimum expansion force was 10°. The actual wall thickness reduction rate was slightly larger than the theoretical calculation value, and related to the friction coefficient. These conclusions provide the corresponding theoretical and technical foundation for field tools and construction.
- Subjects
EXPANSION of solids; PIPE; RESIDUAL stresses; CONES; TIME pressure
- Publication
Academic Journal of Manufacturing Engineering, 2020, Vol 18, Issue 3, p151
- ISSN
1583-7904
- Publication type
Article