Lower thrust structure S/N 0000001 static structural test evaluation report Page: 13 of 53
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III. DESCRIPTION OF TEST
A. TEST ASSEMBLY
The lower thrust structure (S/N 0000001) shown in Figure 1 served as
the static test unit, This unit, a full scale structure fabricated from CRES 347
and CRES 321 stainless steel at the AGC Sacramento Plant, consisted of a cylinder
with a diameter of approximately 36 in. a length of 3 in. and a frustrum 18 in,
deep. Thrust Vector Control (TVC) actuator supports, similar to those which provide
pitch and yaw control for the NERVA engine, were attached to the upper end of the
cylindrical portion at 00 and 270 positions. AGC drawing 280210 describes the
test unit in detail.
The test unit was installed in a universal, self-reacting test fixture
by bolting the pressure vessel closure simulator to the text fixture and then
securing the LTS to this simulator with a three-sectioned, Marman-type clamp.
The test fixture has the capability of individual or simultaneous application of
axial, lateral, and TVC actuator test loads. The axial and lateral loads were
applied to the LTS through a gimbal simulator attached to the gimbal housing.
Using the swivel action of the gimbal simulator, the lateral loads were applied
in tension at the 0 , 90, 180 and 270 positions of the test unit. Axial and
TVC actuator loads were applied both in tension and compression. Figure 2 presents
the test setup and lists the tools used. Figure 3 is a photograph of the setup
where the actuator supports and gimbal housing are being loaded.
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Lower thrust structure S/N 0000001 static structural test evaluation report, report, April 1, 1965; Sacramento, California. (https://digital.library.unt.edu/ark:/67531/metadc1024652/m1/13/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.