Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1981-07-10
1983-10-25
Cannon, James C.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
7386265, 7386268, 177211, 248560, 248634, 248635, 428297, 267 47, 267158, 338 2, G01L 122
Patent
active
044111592
ABSTRACT:
A member of composite material incorporates at least one strain responsive member within a part at which a strain is induced by a load in use. A signal which is a function of a strain detetected by the strain responsive member is communicated to an indicator or monitoring device which registers the applied load causing the strain.
In one embodiment a leaf spring for a vehicle comprises upper and lower elements of one or more superimposed strips of pre-impregnated longitudinally extending carbon fibres and an inner element of one or more strips of pre-impregnated glass fibres. During laying up of the strips two strain gauges (13, 14), which may be on or integral with a carrier strip, and their leads (13a, 13b, 14a, 14b) are introduced into the active length of the spring which experiences a bending moment on the application of a load. The gauges are positioned at a pre-determined distance apart which is maintained when the member is cured, as by hot press moulding.
REFERENCES:
patent: 2298216 (1942-10-01), Lamberger et al.
patent: 2757923 (1956-08-01), Leffsheik
patent: 3080748 (1963-03-01), Burkley
patent: 3350926 (1967-11-01), Webb
patent: 3389459 (1968-06-01), Russell
patent: 3779071 (1973-12-01), Thomas
patent: 4311980 (1982-01-01), Prudenziati
Chiku et al., JSA Transactions, 10 (1), pp. 35-39 (1971).
Anson Paul A.
Spear Peter
Cannon James C.
Rubery Owen Group Services Limited
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