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

stress analysis. The correctness criterion will be .the amount
of strength reserve or plasticity of the part.
At this stage of planning stress analysis is generally conducted
as an elastic problem, which makes it possible to obtain comparatively
simple relationships which are also convenient to use. Such a
calculation is a verification. It does not exclude and, in some
cases, requires a more detailed calculation using special methods
which we shall not. discuss in this book because of space limitations.
Strength reserve.
Plasticity reserve
Stress analysis for parts consists of three stages.
First stage - determining forces and moments acting on the
part and its
unsafe section.
Seoond stage - calculation of stresses which occur in the
part from the effect of forces and moments. This stage, as a rule,
is the most difficult.
Third stage - comparison of stress obtained with limiting
stresses of the stress-strain diagram for the _material from which
the part is made or with stress in similar designs which operate
successfully.
study.
Let us clarify the terminology which we shall be using in
our
The strength of a part is the ability of the pFirt to resist
the loads acting on it. Strength is a function of many factors:
temperature and length of operation, the character of stress variation,
the shape of the part, its dimensions, surface condition, the
design of Junction and couplings, the orientation of the fibers of
the metal and its structure, etc. The proper evaluation of the effect
of each of these factors on strength is one of the tasks of
calculation.
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