The cam plastometer is a mechanical testing machine. It measures the resistance of non-brittle materials to compressive deformation at constant true-strain rates. In this way, it can be compared a bit to the gleeble. In the early days, the machine operates at relatively low strain rates, but over time it has been enhanced and currently it can operate over a wide range of strain rates[1]
The machine is patented under the name of "United States Patent 4109516"[2]. Strain rate, with regards to Materials science, is the change in strain over the change in time and is denoted as έ. A patent is a set of Exclusive rights granted by a State to an inventor or his assignee for a fixed period of time in exchange for a disclosure of an
In the machine, deformation compressive forces are applied to a specimen by two flat, opposing platens which impact a flat, rectangular specimen. The deformation forces can be varied during operation, to simulate actual conditions which occur during industrial pressing and forming operations. The plastometer is also capable of torsional testing of specimens"[2].
The cam plastometers are expensive and there are only a few of them in the world[3].
References
- ^ J. E. Hockett and N. A. Lindsay, Journal of Physics E: Scientific Instruments 4 (1971), 520-522.
- ^ a b Cam plastometer (freepatentsonline.com)
- ^ G. E. Dieter et al. , Handbook of Workability and Process Design, ASM International 2003, page 49
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