Foreign Object Damage by Spherical Steel Projectiles in an N720/Alumina Oxide/Oxide Ceramic Matrix Composite
Foreign Object Damage by Spherical Steel Projectiles in an N720/Alumina Oxide/Oxide Ceramic Matrix Composite
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DOI：
10.1111/jace.13197
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发表时间：
2014-12
影响因子：
3.9
通讯作者：
Sung R. Choi;D. Faucett;D. Alexander
中科院分区：
文献类型：
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作者：
Sung R. Choi;D. Faucett;D. Alexander
在环境温度下，在部分和全部支撑中以法向入射角评估 N720/氧化铝/氧化物陶瓷基复合材料 (CMC) 受到高达 1 马赫的 1.59 毫米球形铬钢射弹的影响时的异物损坏 (FOD) 现象。冲击损伤的形式包括弹坑、基体/纤维丝束断裂、材料压实、分层和锥体裂纹，其发生和程度取决于冲击速度和目标支撑类型。随着冲击速度的增加，部分支撑导致严重损坏，并伴随着强度的大幅下降。目标背面存在的拉应力和可能的应力波相互作用可能是造成部分支撑更大的冲击损坏的原因。尽管以 340 m/s 的速度撞击的 CMC 靶材处于被击穿的边缘，但这些靶材仍然在灾难性故障中幸存下来，保留了约 68% 的原始强度，这表明与整体陶瓷对应物相比，其具有相对优越的 FOD 抵抗能力。基于能量平衡原理对冲击力预测进行了准静态分析，并利用正面碰撞损伤大小的实验数据间接进行了验证。
Foreign object-damage (FOD) phenomena of an N720/alumina oxide/oxide ceramic matrix composite (CMC), impacted by 1.59-mm spherical chrome steel projectiles up to Mach 1, were assessed at ambient temperature at a normal incidence angle in both partial and full supports. The impact damage was in the form of craters, matrix/fiber tow breakage, compaction of the material, delamination and cone cracks, and their occurrence and degree depended on both impact velocity and type of target supports. The partial support resulted in significant damage with increasing impact velocity, accompanying substantial strength degradation. The presence of tensile stress and presumably stress wave interaction at the backside of a target could have been responsible for greater impact damage in partial support. Although the CMC targets impacted at 340 m/s were on the verge of being penetrated, the targets still survived catastrophic failure retaining about 68% of the as-received strength, indicative of relatively superior FOD resistance as compared to monolithic ceramic counterparts. A quasi-static analysis of impact force prediction was made based on the energy balance principle and was validated indirectly using the experimental data on frontal impact damage size.