2099 Aluminum-Lithium with Key-Locked Inserts for Aerospace Applications |
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| Authors: | H Babel J Gibson M Tarkanian C Parrish M Prietto A Ordonez-Chu H Haberl J Kabisch R Clark J Ogren OS Es Said |
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| Affiliation: | (1) The Boeing Compay, 5301 Bolsa Ave, Huntington Beach, CA 92647, USA;(2) Mechanical Engineering Department, Loyola Marymount University, 1 LMU Drive, Los Angeles, CA 90045-8145, USA |
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| Abstract: | The purpose of this study was to determine the acceptability of nonpenetrating, key-locked inserts in 2099 aluminum-lithium.
The tests conducted to make this assessment were: (1) microscopic examination for thread damage and delaminations after key
installation, (2) pull-out load at 21 °C (70 °F) and −179 °C (−290 °F), and (3) mechanical cycling tests at room temperature
and −179 °C (−290 °F). The test results indicated that for the three sizes evaluated, key-locked inserts in 2099-T6 and 2099-T8
were acceptable and although delaminations did occur on some T6 temper specimens, it was only as a failure mode at ultimate
load and such behavior was judged to be acceptable. |
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| Keywords: | 2099 aluminum-lithium 2099-T6 and T8 tempers key-locked inserts |
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