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National Advisory Committee for Aeronautics, Technical Notes - National Advisory Committee for Aeronautics, Technical Notes - National Advisory Committee for Aeronautics, Technical Notes - Compressive Strength and Creep of 17-7 PH Stainless Steel Plates st Elevated Temperatures

Compressive strength test results from room temperature to 1,0000 F
and compressive creep test results from 7000 F to 1, 000° F are presented
for plates of 17-7 PH stainless steel, Condition TH 1,050, which were
edge—supported in V>groove fixtures. Plate width-thickness ratios range
from 15 to 60. The combinations of average stress, temperature, and
time that produce given amounts of creep strain or failure are shown on
master curves which facilitate interpolation of the test results. The
test results are compared with plate strengths and creep failure stresses
determined from semiempirical approximations.

Precipitationphardening stainless steels are finding increasing use
in aircraft structures because of their satisfactory elevated-temperature
properties and the fact that they can be easily fabricated in the annealed
condition, with the strength of the fabricated parts being substantially
increased by subsequent heat treatment. Since plates are important load-
carrying members of aircraft structures, the present investigation was
undertaken to obtain experimental data on the strength and creep behavior
of plates made of 17-7 PH stainless steel, one of these precipitation-
hardening alloys. This investigation of stainless-steel plates is a
continuation of the work reported in references 1 and 2 for aluminum-
alloy plates.

Compressive strength and creep properties of 17—7 PH stainless—
steel plates determined in an elevated—temperature testing program are
presented for plate width-thickness ratios ranging from l5 to 60 over
a temperature range from room temperature to l,OOO° F. The test results
are compared with data predicted by semiempirical methods. These data
were calculated by using procedures for correlating plate strength and
creep properties with elevated-temperature materials data in a manner
similar to that described in reference 1. The experimental creep
results are analyzed and presented in the form of master curves which
facilitate interpolation of the test results.