Material Allowables

Requirements for Development
of Metal Allowable
• Existence of a material specification
• TTen lots l t of fmaterial t i lf from at tl least tt two production d ti heats h t
for each test
• Thi Thickness k range of f the th 10 lots l t to t be b tested t t d should h ld span
the thickness range covered by the material specification
• All tests are performed in accordance with the applicable
standard specifications
• Specific standard properties (tension (tension, compression
compression,
shear, and bearing) are tested at room temperature to
determine Ftu, Fty, Ein, Fcy, Csu, Fbru, and Fbry for e/d = 1.5
and e/D = 2.0 2 0 for each grain direction and each lot
Design and Analysis of Aircraft Structures
14-20