Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1992-03-05
1994-01-25
Raevis, Robert
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01N 324
Patent
active
052807304
ABSTRACT:
Apparatus for testing testpieces (11) in the form of small plates, in which the testpiece is grasped between two pairs of jaws (12,13), which can be moved together. The jaws (12,13) are mounted on the platens (1,4) without hyperstaticity, which reduces the risks of introducing parasitic forces. The testpiece can be notched in such a way that its median portion is exposed to shear. The jaws then have adequate lengths to cover the principal faces of the testpiece (11) virtually up to the notches. The shear field is at a maximum and quasi-uniform in the median surface between the notches. This invention is useful for characterizing the interlaminar shear of plates made from composite materials and includes curved testpieces.
REFERENCES:
patent: 3566681 (1971-03-01), Iosipescu et al.
patent: 4916954 (1990-04-01), Buzzard
American Society For Testing Materials, Phil. Pa. "Fatigue Of filamentary Composite Materials" ASTM Special Technical Publicatoin 636 By: Reifsnider pp. 122-139.
Experimental Mechanics Sep. 1975 "Continuous Servo-Controlled Alignment of Specimens In Materials Testing" By: A. Holmes pp. 358-364.
Cussac Michel
Peres Patrick
Aerospatiale - Societe Nationale Industrielle
Raevis Robert
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