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…2 for fastener callout, e/D=3
(4) Back-to-back strain gages were used on the first two specimens of each environment. If no buckling was observed, the
remaining modulus specimens required strain gage. on one side of the specimens only. Appropriate extensometer may
have been used in place of the strain gage.
(5) Loading direction is generally along the…
https://www.wichita.edu/industry_and_defense/NIAR/Research/tencate-tc250/12k-HTS40-2.pdf