Effects of Prior Aging at 191°C on Creep Response of IM7/BMI 5250-4

<p>The creep behavior of IM7/BMI 5250-4 with fiber orientations of [±45] and [0/90] that were aged in air at 191ºC for up to 1000 hours was evaluated. The total weight loss during the aging process was also evaluated. Weight loss due to aging was 0.64% for the [0/90] fiber orientation and 0.72% for the [±45] fiber orientation. Tensile tests to failure were conducted to establish tensile properties. The [0/90] specimens havea much higher stiffness and Ultimate Tensile Strength (UTS) values than the[±45] specimens. The tensile tests of the aged specimens revealed that the Ultimate Tensile Strength of the composite decreased and the modulus increased with increasing prior aging time. Creep tests were conducted at 191ºC. The creep tests were of 100 hour duration and were followed by unloading to zero stress and 60 hours of recovery at zero stress.</p><p>This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact and remains as true to the original work as possible. Therefore you will see the original copyright references library stamps (as most of these works have been housed in our most important libraries around the world) and other notations in the work.</p><p>This work is in the public domain in the United States of America and possibly other nations. Within the United States you may freely copy and distribute this work as no entity (individual or corporate) has a copyright on the body of the work.</p><p>As a reproduction of a historical artifact this work may contain missing or blurred pages poor pictures errant marks etc. Scholars believe and we concur that this work is important enough to be preserved reproduced and made generally available to the public. We appreciate your support of the preservation process and thank you for being an important part of keeping this knowledge alive and relevant.</p>