Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1984-04-10
1985-11-12
Ciarlante, Anthony V.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73852, G01N 308
Patent
active
045520240
ABSTRACT:
To induce fracture under test conditions for a tool bit configuration held in a laterally restrained condition, but with freedom to move up and down, a series of members (hardened steel ball bearings) are selected as to size, butted together, and constrained so that such members make tangential point contact with a constrained bit at locations close to the corners of one end surface supported on the members. When a centralized load is imposed on the opposite end surface of the bit, stress forces can be set up on the bit to result in a body bend fracture or an edge chip fracture, depending on how close the point contacts are to a curved sector. Each point contact is located along a radius bisecting a corner sector, the location being spaced from the sector a distance either (a) of at least one-half the sector radius, but within 0.01875-0.0312 inch, to induce edge chip fracture, or (b) of at least the sector radius, but no less than 0.0625 inch, to induce bend strength fracture.
REFERENCES:
patent: 2032989 (1936-03-01), Kenney et al.
patent: 3874228 (1975-04-01), Fatt
Greenbank et al., "Apparatus for Bending Crystals at Constant Strain Rate", J. Phys. E(GB), vol. 3, 11/70, pp. 949-950.
Allor Richard L.
Baker Robert R.
Ciarlante Anthony V.
Ford Motor Company
Malleck Joseph W.
May Roger L.
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