Please use this identifier to cite or link to this item: https://doi.org/10.1007/BF00356544
Title: Effective and recovery stresses in deformation studies of polyvinyl chloride and polypropylene using the modified strain transient dip test
Authors: Teoh, S.H. 
Poo, A.N. 
Ong, G.B.
Issue Date: Jan-1994
Source: Teoh, S.H.,Poo, A.N.,Ong, G.B. (1994-01). Effective and recovery stresses in deformation studies of polyvinyl chloride and polypropylene using the modified strain transient dip test. Journal of Materials Science 29 (18) : 4918-4926. ScholarBank@NUS Repository. https://doi.org/10.1007/BF00356544
Abstract: Partitioning the applied stress into internal stress components (effective and recovery) using the modified strain transient dip test is a useful approach towards a better understanding of the viscoelastic nature of polymers. The internal stresses of polyvinyl chloride (PVC) and polypropylene (PP) were measured successfully using this test on a computer-controlled electro-servo hydraulic tensile testing machine which was designed for rapid step unloading in less than 1 s to avoid memory effects of the polymers. A power-law relationship can be used to describe the variation of the internal stress components with strain. Actual yield strains occurred at smaller values (less than 2%) than those obtained from a conventional stressstrain diagram (which for PVC and PP exceed 3.5% and 7%, respectively). This observation indicated that plastic yielding occurred much earlier and yield strains from conventional stress-strain diagrams may be overestimates. For very ductile material (PP) the activation volumes were comparable in magnitude to that obtained conventionally; whilst for less ductile material (PVC), the activation volume was four times higher. One of the main advantages of stress partitioning is for the detailed definition of the extrapolated yield point which otherwise will be missed out in a conventional plot of applied stress and strain. © 1994 Chapman & Hall.
Source Title: Journal of Materials Science
URI: http://scholarbank.nus.edu.sg/handle/10635/58211
ISSN: 00222461
DOI: 10.1007/BF00356544
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

3
checked on Dec 13, 2017

Page view(s)

32
checked on Dec 8, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.