Design and Stress Analysis of Extraterrestrial ... - The Black Vault

A shortcoming of graphite is the nonpreservation of properties
during reheating, which is the result of sintering and graphitization.
Some data on graphite has been given in Fig. A.3.
Berillium
Berillium is widely used in retarders and reflectors of reactors.
ft is characterized by the small absorption cross section of thermal
neutrons and has good strength qualities and corrosion resistance.
A shortcoming of berillium is its toxicity at the stage of
technological processing.
The basic strength characteristics of berillium are shown in
Figures A.4a, b, and c.
Stainless steels
Stainless steels are widely used in extraterrestrial engines.
The most widely used is Khl8N9T. Its characteristics for short-,
term and long-term strengths are shown in Fig. A.5. The strain
diagram is illustrated in Fig. A.6.
Figure 3.7 in Chapter III presents the graph of a variation and
Figure 3.15 the graph of variation in modulus E based on temperature.
Curves of rupture strength and plasticity for this steel are presented
in Fig. A.7, a, b, and c.
:I
Figure A.8 shows the curves of rupture strength for'other stainless
steels having higher strength characteristics.
Niobium and its alloys
Niobium has many positive properties which enable its use in
extraterrestrial electric rocket eng .aes.
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