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Observations of details of hysteresis loops in westerly granite
Author(s) -
Peselnick L.,
Liu HsiPing,
Harper K. R.
Publication year - 1979
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl006i009p00693
Subject(s) - amplitude , hysteresis , dissipation , modulus , capacitive sensing , displacement (psychology) , geology , strain (injury) , materials science , stress (linguistics) , physics , condensed matter physics , optics , composite material , thermodynamics , medicine , psychology , linguistics , philosophy , computer science , psychotherapist , operating system
Capacitive‐displacement transducers were used in an apparatus designed to measure the specific dissipation constant Q‐1 and to determine the details of the shape of stress‐strain hysteresis loops for rocks. For room‐dry Westerly Granite at room temperature and pressurehysteresis loops were recorded for cyclic strains having amplitudes between 0.6 × 10 −6 to 0.5 × 10 −5 at a period of 5 seconds. Two types of wave forms were used: a quasisinusoid at the lower strains and a distorted sinusoid having flattened peaks at the larger strains. Loops having sharp corners or cusps reported in the literature were not observed. The measured Q E (for the Young's modulus mode) at 0.2 Hz and 10 −6 strain amplitude was 87± 7.