Photoplastic study of the effect of friction on the deformation and flow of rings in axial compression
The influence of friction on the deformation, flow, and strain distribution of rings in axial compression was investigated using the method of photoplasticity. A rigid polyester resin (Laminac 4116) which exhibits plastic strain birefringence in visible light was used. Its deformation properties can be adjusted to best simulate aluminium undergoing hot deformation. Data from uniaxial tension and compression tests indicate that the polyester material may follow a modified von Mises yield criterion. Rings with geometry 6:3:2 (outside diameter:inside diameter:thickness) were compressed axially by different amounts (8 to 24%) between platens with different coefficients of friction. Results are compared with the mathematical solution for constant interface friction and with allowance for bulge formation. Three-dimensional strain distributions are determined and the position of the neutral radius (epsilon/sub theta/ = 0) through the thickness are presented. The results reveal an increase in the neutral radius where the contact area increases. The experimentally obtained strain distributions are integrated in the axial and radial directions and are compared with the external displacements that are measured on the deformed rings.
- Research Organization:
- Universidade Federal de Uberlandia (Brazil). Dept. of Mechanical Engineering; Iowa State Univ. of Science and Technology, Ames (USA). Dept. of Engineering Science and Mechanics
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5835397
- Report Number(s):
- ISM-238; CONF-790503-7
- Resource Relation:
- Conference: Spring meeting of society for experimental stress analysis, San Francisco, CA, USA, 20 May 1979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM
DEFORMATION
LAMINAC
COMPRESSION
CONFIGURATION
FRICTION
MATHEMATICAL MODELS
RINGS
STRAINS
ELEMENTS
ESTERS
METALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYESTERS
POLYMERS
360403* - Materials- Polymers & Plastics- Mechanical Properties- (-1987)
360103 - Metals & Alloys- Mechanical Properties