00000nam 2200000zi 4500 9.867929 CaOODSP 20221107162438 m o d f cr ||||||||||| 190201s1960 onc ot f|0| 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn--- M38-1/68-1960E-PDF McGrath, J. T., author. Mechanical and structural changes during the deformation of copper by fatigue / by J. T. McGrath and R. C. A. Thurston. Ottawa, Ontario : Department of Mines and Technical Surveys, 1960. 1 online resource (iv, 20 pages) text txt rdacontent computer c rdamedia online resource cr rdacarrier Mines Branch Research Report ; R 68 "July, 1960." Includes bibliographic references. "The structural changes which take place in polycrystalline copper under the action of alternating cycles of torsion stress were studied, using the optical microscope and the X-ray diffraction camera, and an attempt was made to correlate them with changes in the shape of the cyclic stress-strain curve. It was found that the period of work-hardening was less than one per cent of the fatigue life, and that persistent surface markings, which are assumed to be incipient or actual microcracks, occur upon completion of work-hardening. X-ray diffraction patterns revealed considerable grain distortion at the completion of work-hardening in specimens cycled at a high strain amplitude This distortion became progressively less as the strain amplitude decreased"--Abstract, page i. Includes abstract in French. gccst Metals Thurston, R. C. A., author. Canada. Department of Mines and Technical Surveys. Canada. Mines Branch. Research report (Canada. Mines Branch) R 68. (CaOODSP)9.855660 PDF 3.85 MB https://publications.gc.ca/collections/collection_2019/rncan-nrcan/m38-1/M38-1-68-1960-eng.pdf