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Investigating the relationship between radial pre-stress magnitude and ballistic projectile dwell in heavy confined ceramic targets
International Journal of Impact Engineering ( IF 5.1 ) Pub Date : 2021-08-14 , DOI: 10.1016/j.ijimpeng.2021.104002
Shannon Ryan 1 , Denver Gallardy 2 , Michael Zellner 2 , Jeff Bunn 3 , Long Nguyen 1 , Patrick Swoboda 2
Affiliation  

A series of bare silicon carbide ceramic armour disks were manufactured with high-strength steel containment to induce varying magnitudes of radial pre-stress. The induced radial stresses, ranging from 0 to 900 MPa, were measured via neutron diffraction and verified by comparison with numerical calculations. Four targets of each configuration, referred to as slip-fit, moderate pre-stress, and high pre-stress, were subject to ballistic testing with hemispherical-nose, tungsten heavy alloy long rod projectiles to determine the interface defeat transition velocity. In-situ diagnostics were unsuccessful in aiding the identification of interface defeat, necessitating a reliance on post-mortem assessment. A transition velocity of approx. 1000 m/s was identified for the unstressed target, increasing to approx. 1200 m/s for the pre-stressed configurations. No performance effect was discernible between the moderate (372 MPa) and high (899 MPa) pre-stress configurations, suggesting that an optimal performance may be achieved for lower pre-stress levels (i.e., <372 MPa). The test results were compared with four semi-analytical predictions of interface defeat performance and good agreement was found, albeit with significant range in the model predictions.



中文翻译:

研究径向预应力大小与弹道弹丸在重型受限陶瓷目标中的停留时间之间的关系

一系列裸露的碳化硅陶瓷装甲盘采用高强度钢容器制造,以引起不同大小的径向预应力。通过中子衍射测量产生的径向应力,范围从 0 到 900 MPa,并通过与数值计算的比较进行验证。每种配置的四个目标,称为滑动配合、中等预应力和高预应力,用半球形鼻、钨重合金长杆射弹进行弹道测试,以确定界面失效过渡速度。原位诊断在帮助识别接口失效方面不成功,因此需要依赖事后评估。大约的过渡速度。无应力目标的速度为 1000 m/s,增加到大约 1000 m/s。预应力配置为 1200 m/s。在中等 (372 MPa) 和高 (899 MPa) 预应力配置之间没有明显的性能影响,这表明可以在较低的预应力水平(即 <372 MPa)下实现最佳性能。将测试结果与界面失效性能的四种半分析预测进行了比较,发现了良好的一致性,尽管模型预测的范围很大。

更新日期:2021-08-19
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