ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Stress relaxation tests conducted on poly(methyl methacrylate) (PMMA) in various forms have been analysed using the procedure of Kubát and Rigdahl. The values ofσ i, the internal stress parameter, obtained from this analysis are subject to large errors and do not provide useful comparators, nor do they correlate with residual stress measurements made by the layer removal method. The index,n, changes with test temperature in a systematic manner and reveals marked differences in relaxation behaviour between the different classes and specimens investigated. A new method for estimating activation volume from the stress relaxation procedure has been tested and found to give values that are much higher for injection-moulded bars than for “Perspex” sheets as-received or hot-drawn.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00586286
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