Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1992-04-23
1994-05-17
Williams, Hezron E.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73846, G01N 324
Patent
active
053117670
ABSTRACT:
The invention relates to an instrument and method for measuring the viscoelastic properties of rubber and like materials comprising two opposed dies, each die having a die housing, the dies and housings being moveable between an open position and a closed position, and wherein: a) each die is separated from its housing by a substantially uniform circumferential gap such that the die is rotatable relative to its housing, and one die is rotatable relative to the other, b) in the closed position, the two dies define between them a cavity for holding under pressure a sample of material to be tested, c) the design of the dies and housings is such that during movement from the open position to the closed position, a sample of test material located between the dies is compressed so that excess material is extruded radially from between the dies, across the gap between each die and its housing and through a narrowing space separating the housings until the two housings reach their closed position, in which position the said space is sealed. The radial dimension of the gap between each die and its housing is significantly less than in prior art instruments, and sheets of film of heat and distortion-resistant material are used to bridge the gaps.
REFERENCES:
patent: 4337646 (1982-07-01), Fraleigh
patent: 4552025 (1985-11-01), Barker et al.
patent: 4584882 (1986-04-01), Tosaki
patent: 5079956 (1992-01-01), Burhin et al.
patent: 5163317 (1992-11-01), Ono et al.
American Society for Testing and Materials (1990) (ASTM) D1646-89 vol. 9, pp. 307-314 (310).
IBM Technical Disclosure Bulletin vol. 31, No. 2, Jul. 1988, New York, US, p. 61, "Modified Technique for Using an Oscillating Shearing Disk Viscometer".
Mathews Michael
Rusling David G.
Stolc Michael J.
Monsanto PLC
Roskos Joseph W.
Seward Gordon B.
Williams Hezron E.
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