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- W2078021234 abstract "Abstract A description is presented of experiments performed with LiF single crystals loaded at high strain rates in simple shear by means of a torsional Kolsky bar. Four specimens are used in each test; they are shaped as rectangular parallelepipeds and the tractions are applied in the [1 1 0] directions on the faces parallel to the ( 1 1 0) planes. The experiments provide a measure of flow stress as a function of strain at strain rates of 400 and 800 s−1; the results are compared with those of quasi-static tests performed at strain rates of 4.8 × 10−5 and 1.6 × 10−4s−1 in the same apparatus. In addition, incremental strain rate experiments were performed. These consist in imposing first a quasi-static strain rate which is increased suddenly and with no intermediate unloading to a dynamic rate. The results showed that the flow stress of LiF is strongly sensitive to strain rate but that the effects of strain rate history, although present, are not pronounced. Microscopic observations using the etch pit technique showed that the dislocations are distributed uniformly after deformation at a constant quasi-static strain rate but that they congregate into wide bands as the result of incremental strain rate testing." @default.
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- W2078021234 date "1981-05-01" @default.
- W2078021234 modified "2023-10-02" @default.
- W2078021234 title "Strain rate history effects in LiF single crystals during dynamic loading in shear" @default.
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- W2078021234 doi "https://doi.org/10.1016/0025-5416(81)90006-9" @default.
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