Abstract
The application of hydrostatic pressure to martensitic materials generates a shear stress at the martensite-austenite interface due to the different elastic properties of the martensite and austenite phases. A closed-form solution for the maximum interface shear stress is developed for a single martensite plate in an infinite austenite matrix. The magnitude of this interface shear stress is a function of the applied hydrostatic pressure, the geometry of the martensite plate inclusion, and the elastic properties of the phases. Interface shear stresses are calculated and compared to hydrostatic pressure data from 0 to 2.3 kbar. It is found that the interface shear stress is of the correct order of magnitude, when combined with the pressure-volume-change term, to account for the large depression of the austenite start temperature with pressure (−30°C/kbar). The shear modulus and Poisson's ratio are reported for the temperature range of 22°–350°C for both the austenite and a 95 per cent martensite specimens.
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