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了挤压电缆包皮,采用纯度99.6、99.7和99.8％的铝。在许多情况下(例如,用于超导电电缆)均采用一纯度99.99％或更纯的铝。关于铝的变形阻力S_д方面的文献资料是很有限的,大致属于高变形速度方面。图1示出了按已知文献资料得出的纯度99.2、99.5和99.99％铝的试验数值。这些资料表明,对纯度99.2～99.9％的铝来说,相应的温度和相应的速度下的数值S_д实际上是不变的,而当继续提高铝的纯度时,急剧降低。因此,按上述资料不可能
Extruded the cable sheath with aluminum of 99.6, 99.7 and 99.8% purity. In many cases (eg, for superconducting cables) aluminum is used with a purity of 99.99% or more pure. Literature on the deformation resistance of aluminum S_д literature is very limited, generally belong to the high deformation speed. Figure 1 shows the experimental values for purity of 99.2, 99.5 and 99.99% of aluminum obtained from known literature. These data show that for aluminum with a purity of 99.2 to 99.9%, the value S_j for the corresponding temperature and corresponding speed is virtually constant, and drastically decreases as the aluminum purity continues to increase. Therefore, the above information is impossible