Slip Line Field Method - Presentation
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Slip line field method and its application in forming process Manufacturing Process Class - Final year
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Slip Line Field Method - Presentation
- 1. SSLIPLIP LLINEINE FFIELDIELD MMETHODETHOD AND ITSAND ITS AAPPLICATION INPPLICATION IN FFORMINGORMING PPROCESSROCESS Group 1Group 1 (Roll No. 49,50,51,52)(Roll No. 49,50,51,52)
- 2. Slip ? process which allows plastic flow to occur in metals , where the crystal planes slide past one another
- 3. Why ? force required for the entire block of crystals to slide is very large lower level of stress is required
- 4. Slip Lines ? P β - line α - line φ
- 5. Slip Line Field ? Orthogonal networks of the lines of maximum shear stress The slip line patterns above are very useful for analyzing plane strain deformation in a rigid-plastic isotropic solid
- 6. Slip Line Field ? Slip-line field for compression between a pair of rough parallel platens
- 7. Slip Line Field Method It is an approach used to model plastic deformation in plane strain only for a solid that can be represented as a rigid-plastic body.
- 8. Assumptions
- 9. Rigid-Plastic Material Response no elastic deformation and perfect plastic deformation Fig 1. Rigid Plastic Material Response
- 10. In deformations of practical interest one of the principal strains (say ) is zero It is applicable to rolling , drawing and forging. Plane Strain
- 12. EXAMPLES Try to use Slip Line Field Method to solve some problems To determine the value of force (P)
- 13. Rigid Punch Indenting a Plastic Solid Solution:
- 16. Plane Strain Extrusion (Hill) α slip-line slip-line β H 2H 30o 45o 45o P A B C D a b E F e1 e2
- 17. Plane Strain Extrusion (Hill) σ22 σσ11 τ σ kσ σ k π/3k nn ab
- 18. Plane Strain Extrusion (Hill) @ a @ b resultant force acting on CD and AB Thus required force P= -2k
- 19. Double-Notched Plate In Tension α slip-line slip-lineβ α P P α a A B
- 20. Double-Notched Plate In Tension @ a @ b
- 21. REFERENCE S G K Lal , Introduction to Machining Science. http://solidmechanics.org/text/Chapter6_1/Chapter6_1.htm http://www.engin.brown.edu/courses/en222/Notes/sliplines/sli plines.htm http://www.globalspec.com/reference/70308/203279/html- head-chapter-9-slip-line-field-analysis
- 22. QUESTIONS?
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