Materials and Methods of Construction in Light Structures Page: 8 of 38
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I.A.C.A. Technical Momorandum no. 515
the fact that the rivets in the vicinity of the junctions
must be removed by drilling or must be hammered down, and
their distribution is often unsuited to the other dimen-
sions of the gusset plates.
In order to avoid the constructional difficulties of
light steel structures, less strength is often tolerated.
For example, the flanges of the Dornier spars, so far as
I know, are made from stool of 70-80 kg/mmn (99,560 to
113,780 lb./sq.in.) strength.
In order to avoid the loss in weight occurring at the
junction points in using stool of loss strength, Dornior
uses-duralumin for these parts. In so doing, ho sacri-
fices to a considerable extent, however, the advantage he
claims for the great resistance of stool to fatigue, which
here concerns only the spar flanges, while the spar itself
is just as liable to break from the failure of the diag-
onal or perpendicular bracing members. As a matter of
fact, I consider steel and duralumin equivalent with re-
spect. to fatigue, for the so-called "fatigue" is nothing
but a matter of ultimate yielding, after the frequent
stressing of the material beyond the proportionality limit,
iatorial of 35-40 kg/mm? (49,780 to 56,890 lb./sq.in.)
is used for welded tubular construction, whereby the weight
loss in comparison with duralumin is partially offset by
the almost total elimination of other junction-point losses.
In comparison with steel, duralumin has the advantages
of greater wall thickness, simpler forms and greater rapid-
ity of working.
I do not care to speak now of the other light metals,
such as lautal, which has given very good results in tech-
nical tests, but is not yet furnished in suitable form for
manufacturing, or "skleron," which is too hard,
Elektron is too sensitive to water to be used for .im-
portant airplane parts, but can well be used for small
fittings, lightly stressed levers, etc,
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Rohrbach, Adolf. Materials and Methods of Construction in Light Structures, report, May 1929; (https://digital.library.unt.edu/ark:/67531/metadc65364/m1/8/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.