GB963502A - Valve controlled material testing machine with double operation and closed pressure medium circuit - Google Patents
Valve controlled material testing machine with double operation and closed pressure medium circuitInfo
- Publication number
- GB963502A GB963502A GB974561A GB974561A GB963502A GB 963502 A GB963502 A GB 963502A GB 974561 A GB974561 A GB 974561A GB 974561 A GB974561 A GB 974561A GB 963502 A GB963502 A GB 963502A
- Authority
- GB
- United Kingdom
- Prior art keywords
- loading
- solenoids
- dynamometer
- lines
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
963,502. Compression and extension testing. W. & T. AVERY Ltd. March 17, 1961 [April 2, 1960], No. 9745/61. Heading G1S. Apparatus for compression and extension testing of materials has a fluid-pressure loading system the direction of pressure in which is reversible by means of valves controlled by signals from a dynamometer system whereby loading of the specimen is reversed when the load reaches predetermined values. As shown in Fig. 1, fluid pressure generated by a pump 10 can be applied to either side of piston 1 loading the test-piece 13 by reversing valve 7 which is controlled by solenoids 11, 12. These are activated alternately in response to predetermined compression and extension indications'of dynamometer 14 which, after amplification by amplifier 15, are mixed in comparator unit 17 with a steady nominal signal from one of the transmitters 16a, 16b, the positive or negative resultant signal, amplifed by the controlling amplifier 18, selectively activating one of the solenoids 11, 12. In this way, the stress of the testpiece 13 will follow a time-variation as indicated in Fig. 7. Relaxation of the pressure whenever the direction of loading reverses takes place gradually. Smooth increasing stress in one direction can be obtained by using both transmitters 16a and 16b, the signal levels of which are slightly different, and increasing these at the same rate, as indicated by lines e and f in Fig. 8. Actuation of the solenoids 11 and 12 will thus occur alternately for the values defined by these lines, the median line d representing the loading curve to a degree of approximation set by the difference between the lines e and f. In modifications fluid pressure accumulators are provided in one or both pipes 5, 6, and a single transmitter 16 may be provided, solenoid 11 or 12, then operating when the signal from dynamometer 14 exceeds that from 16 by a predetermined amount in one direction or the other.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DESC027683 | 1960-04-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB963502A true GB963502A (en) | 1964-07-08 |
Family
ID=7430859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB974561A Expired GB963502A (en) | 1960-04-02 | 1961-03-17 | Valve controlled material testing machine with double operation and closed pressure medium circuit |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH394639A (en) |
| GB (1) | GB963502A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1698154B1 (en) * | 1968-03-18 | 1971-08-26 | Ruedgisch Edgar Von | Device for testing the fatigue strength of upholstered furniture |
| GB2163870A (en) * | 1984-08-29 | 1986-03-05 | Atomic Energy Authority Uk | Machines for testing materials |
| GB2205959A (en) * | 1987-06-17 | 1988-12-21 | Northern Eng Ind | Stress testing materials |
| EP2746591A1 (en) * | 2012-12-21 | 2014-06-25 | Robert Bosch Gmbh | Hydraulic drive for fatigue tests, use of a multiple cylinder for fatigue tests and method of controlling the hydraulic drive |
-
1961
- 1961-03-15 CH CH318961A patent/CH394639A/en unknown
- 1961-03-17 GB GB974561A patent/GB963502A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1698154B1 (en) * | 1968-03-18 | 1971-08-26 | Ruedgisch Edgar Von | Device for testing the fatigue strength of upholstered furniture |
| GB2163870A (en) * | 1984-08-29 | 1986-03-05 | Atomic Energy Authority Uk | Machines for testing materials |
| GB2205959A (en) * | 1987-06-17 | 1988-12-21 | Northern Eng Ind | Stress testing materials |
| EP2746591A1 (en) * | 2012-12-21 | 2014-06-25 | Robert Bosch Gmbh | Hydraulic drive for fatigue tests, use of a multiple cylinder for fatigue tests and method of controlling the hydraulic drive |
Also Published As
| Publication number | Publication date |
|---|---|
| CH394639A (en) | 1965-06-30 |
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