| 释义 |
extensometer|ɛkstɛnˈsɒmɪtə(r)|
[f. L. extensus, pa. pple. of extendere to extend + -ometer.]
An instrument for measuring the deformation of metal under stress, or an instrument in which such deformation is used to register the elastic strains borne by other materials (e.g. concrete); (see also quot. 1958).
1887Proc. Physical Soc. VIII. 183 Screw-Micrometer Extensometer. 1902Encycl. Brit. XXXIII. 10/1 Extensometers, or apparatus for observing the small deformation which a test-piece in tension or compression undergoes before its limit of elasticity is reached. 1925E. S. Andrews Strength of Materials (ed. 2) 371 Extensometers are instruments for measuring the elastic strains of materials in tension or compression. 1950Engineering 25 Aug. 172/3 Twin extensometers were mounted in a manner similar to that employed in tests on reinforced-concrete beams using the Lamb extensometer. 1958New Scientist 15 May 38/3 Earth strains in the Andes are to be studied by..seismologists working with ‘extensometers’... The extensometer or strain-seismograph measures the differential motion between two nearby points, those at the ends of the instrument. The change of length between the two ends—which may either stretch or squeeze—divided by the original length gives the change in strain. 1966Ibid. 23 June 796/2 A hydraulic extensometer sensitive to dimensional changes in the order of one part in 10 000. |