Rising step-load test apparatus

Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specimen clamp – holder – or support

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73831, 73853, G01N 304

Patent

active

055490077

ABSTRACT:
A rising step-load test apparatus for subjecting the notched region of a fracture specimen to tension by applying four-point bending to the specimen, and having an adaptor that can fit into the test apparatus in four-point bending and convert the bending load to an axial tensile load on a second specimen for which the adaptor serves as a fixture. The test apparatus applies four-point bending to either the fracture specimen or the adaptor through two oppositely situated simple supports at one end of the fracture specimen or adaptor and two other oppositely situated simple supports at the other end of the fracture specimen or adaptor. The adaptor employs two pivotally attached linking members attached to the two ends of the second specimen to transfer a pure axial tension to the second specimen for testing in axial-tension mode. A chemical bath is provided for an accelerated test of hydrogen embrittlement.

REFERENCES:
patent: 1332491 (1920-03-01), Figari
patent: 1486752 (1924-03-01), Humpert
patent: 1548382 (1925-08-01), Paul
patent: 3270556 (1966-09-01), Henriksen
patent: 3548646 (1970-12-01), Holman
patent: 4017198 (1977-04-01), Mason
patent: 4836485 (1989-06-01), Cooper
patent: 4845997 (1989-07-01), Radin et al.
patent: 5388464 (1995-02-01), Maddison
Notched Bar-Bending Test by R. C. Movich, pp. 64-72, 1974.
Accelerated, Low-Cost Test Method for Measuring the Susceptibility of Hy-Steels to Hydrogen Embrittlement (American Society for Metals) by L. Raymond and W. R. Crumly, 1982.
Investigation of the Conditions for Crack Propagation and Arrest Under Cathodic Polarization by Rising Step Load Bend Testing (Corrosion, vol. 47, No. 2) by P. S. Tyler, M. Levy, and L. Raymond, 1991).
Low Hardness High Risk--Hydrogen Embrittlement of Fasteners: Problems and Solutions (American Eastern Journal May/Jun. 1993) by Dr. Louis Raymond, May/Jun. 1993.

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