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Digital Image Correlation Measurement of the Deformation and Failure in PBX Brazilian Discs Reinforced with CFRP Patches
Propellants, Explosives, Pyrotechnics ( IF 1.8 ) Pub Date : 2021-02-03 , DOI: 10.1002/prep.202000153
Shengnan Wang 1 , Wei Tang 1 , Chen Liu 1 , Biao Li 2 , Mingfeng Tang 1 , Maoping Wen 1
Affiliation  

Polymer‐bonded explosive (PBX) is a mechanical weak link in weapons systems. PBX is susceptible to cracking owing to its brittle nature, which seriously threatens the security and reliability of the weapons system. In this work, a novel strengthening method making use of a carbon fibre reinforced polymer (CFRP) patch was adopted to enhance the mechanical performance of the PBX. Brazilian compression tests were conducted on the unreinforced, locally reinforced, and fully reinforced PBX discs to elucidate the strengthening mechanism of the patch. Digital image correlation was employed to characterise the deformation and failure processes of the discs during the full testing period. The results showed that failure of the PBX was caused by initiation and extension of the deformation that localises within the regions near the loading positions. The CFRP patches provided the benefits of load transfer and deformation confinement, which alleviated stress concentration in the disc. Consequently, collapse of the patched discs was delayed, and the load‐carrying ability was improved. The findings of this study may deepen our understanding of PBX failure behaviours, and further the performance optimisation of weapons systems.

中文翻译:

CFRP修补加固的PBX巴西圆盘变形和破坏的数字图像相关测量

聚合物粘结炸药(PBX)是武器系统中的机械薄弱环节。PBX具有脆性,因此容易破裂,这严重威胁了武器系统的安全性和可靠性。在这项工作中,采用了一种新的利用碳纤维增强聚合物(CFRP)补片的增强方法来增强PBX的机械性能。在未增强,局部增强和完全增强的PBX圆盘上进行了巴西压缩测试,以阐明修补程序的增强机制。在整个测试期间,使用数字图像相关性来表征光盘的变形和破坏过程。结果表明,PBX的故障是由变形的开始和扩展引起的,该变形位于载荷位置附近的区域内。CFRP贴片提供了载荷传递和变形限制的优势,从而减轻了圆盘中的应力集中。因此,延迟了补丁光盘的崩溃,并且提高了承载能力。这项研究的结果可能加深我们对PBX失效行为的理解,并进一步优化武器系统的性能。
更新日期:2021-03-31
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