Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1990-08-08
1992-02-25
Raevis, Robert
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01N 1100
Patent
active
050902490
ABSTRACT:
Creep/recovery tests of a small sample are carried out on a conventional testing machine with vertical compression capabilities using an additional spring which allows the drive system of the testing machine to apply the force to the small sample substantially instantaneously and then to maintain that force substantially constant as required for a creep/recovery test. The addition of the spring allows the drive system to be halted at the predetermined required force with high accuracy. The spring is selected to have a large deformation relative to the deformation of the sample during the creep period so that the force is maintained substantially constant irrespective of the creep deformation of the sample. For the first time this arrangement allows creep/recovery tests of small samples such as seeds to be carried out.
REFERENCES:
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patent: 4313289 (1982-02-01), Birdsong, Jr.
patent: 4972719 (1990-11-01), Vinson et al.
Smirnov et al., "Device for the Quick Analysis of the Mechanical Properties of Damp Pellets", Ind. Lab. (U.S.A.), vol. 39, No. 4 (Apr. 1973).
Ade Stanley G.
Battison Adrian D.
Raevis Robert
Thrift Murray E.
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