Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1990-07-19
1991-10-15
Raevis, Robert
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01N 300
Patent
active
050563700
ABSTRACT:
A method and apparatus for testing a test piece having opposing ends includes connecting the ends of the test piece to a first load head and to a plate which may be attached to a second test head, respectively. The device actuates a driving device to spatially adjust the load head to apply a variable load to the test piece. The device determines the magnitude and direction of load head displacement variables applied to the load head, measures the actual magnitude and direction of displacement of the load head in relation to a fixed plate, sets and varies boundary conditions of the test piece from the displacement of the load head, compares actual values of the boundary conditions with freely programmable predetermined desired values of the boundary conditions, and determines a control variable for the driving device. In order to extend testing capabilities, the device determines additional control variables for the driving device using one of values measured in a test area located between the ends of the test piece and values that can be reduced to correspondingly measured values, wherein functional dependencies of the additional control variables are determined before the determination of the load head displacement variables or by identifying the additional control variables in the test.
REFERENCES:
patent: 2446566 (1948-08-01), Wenk
Maier, "The B.T.M. Testing System Applications for Six Degree Freedom of Condition Loading", Institute of Steel Construction Technology University of Braunschweig, 1988.
Maier et al., "The BTM-Concept-An Experimental Method to Simulate the Behavior of Substructures Consisting of Truss or Beam Members", pp. 1-6, published 1988, at the Ninth World Conference on Earthquake Engineering.
"Multi-Degree of Freedom Boundary Condition Simulator", MTS Design Description, 1988.
Kiel, "Development of an Intelligent Testing Machine for Complete Supporting Structures Exposed to Fire", presented at the Braunschweig Fire Protection Conference 1989, Sep. 6 and 7.
Ramu et al., "Experimental Installation for the Testing of Supports Under Permanent Loads", Schweizer Archiv., vol. 34, No. 9, pp. 273-282, published Sep. 1968.
Maier, "The Concept of Communicating Experimental Methods for Supporting Girder Structures", pp. 141-147, University of Stuttgart, Germany, 1986.
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