By J. Gerhold (auth.), U. Balu Balachandran, K. Ted Hartwig, Donald U. Gubser, Victoria A. Bardos (eds.)
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Additional resources for Advances in Cryogenic Engineering Materials : Volume 46, Part A
The JETT specimen is a round bar with a circumferential notch as shown in Figure 3. 1 mm width was induced by an electrodischarge machining. The net section diameter and the notch width were measured with a reading microscope of 20 times magnification. Table 2 lists the JETT specimen code and the test results. When the JETT was performed, two or three extensometers were attached to the specimen to cancel the bending component. The type of the extensometer, the way of attachment and the gage length was different among the affiliations, but the stroke rate was arranged to be almost same.
The internal stress fields around the martensite clystals which were oriented by external stresses behave similarly to the stress fields around flat dislocation pile-ups: they assist singlet slip and thus increase plasticity. Figure 3. Texture of deformation-induced a-martensite in Fe-18Cr-lONi crystal ; T = 240 K, (, = 20 %; magnification = x 600. 24 Martensite transformations influence the alloy plasticity in ditlerent ways: in Fe-Cr-Ni alloys the plasticity is high if during deformation the martensite transformation is weak, and vice versa.
The local maximum stress in a gap may roughly be taken as the crucial quantity for breakdown in liquids at a first glance. However, this simple thumbs rule can be misleading in vacuum gaps for instance. The withstand voltage can be considerably reduced in comparison to a uniform field gap 8. There is little chance to handle very high voltages, but much experience in the field of medium high voltage circuit breakers gives some confidence into vacuum systems. Volume effects in liquids may formally be understood from Weibull statistics; however, no convincing quantitative matching could yet be found in case of LHe for instance 18.