The Hugoniot and Strength of Ultem 1000 Polyetherimide

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• 作者：Christopher Neel ; Lalit Chhabildas
• 关键词：Ultem ; Polyetherimide ; PEI ; Shock ; Hugoniot ; Strength
• 刊名：Journal of Dynamic Behavior of Materials
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：1
• 期：3
• 页码：225-236
• 全文大小：1608KB
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• 作者单位：Christopher Neel (1)
  Lalit Chhabildas (1)
  
  1. Air Force Research Laboratory, Munitions Directorate, Eglin Air Force Base, Florida, 32542, USA
  
• 刊物类别：Metallic Materials; Continuum Mechanics and Mechanics of Materials;
• 刊物主题：Metallic Materials; Continuum Mechanics and Mechanics of Materials;
• 出版者：Springer International Publishing
• ISSN：2199-7454

文摘

Parallel-plate impact studies using a single stage powder gun have been performed to investigate the shock and subsequent release behavior of the commercial polyetherimide polymer Ultem鈩?up to 13 GPa. Two different experimental configurations were used to observe both the shock and unloading behavior. In one configuration, the unloading was continuously tracked by observing transmitted wave profiles in the Ultem samples through a transparent interferometer window. In the other configuration, the unloading was inferred from observing stress wave reverberations in an elastic target plate resulting from impact by the Ultem sample. The loading behavior indicated by the two methods agreed very well and the resulting Hugoniot was represented by U_S = 2.42 + 1.61*u_P. This study also demonstrated that the plate reverberation method of following the unloading response, though not observing the continuous unloading of the sample, agrees extremely well with the unloading response recorded using continuous data obtained using interferometry windows. The results are used to build a case that the strength 蟿 of Ultem increases with shock stress from 0.03 to 0.08 GPa over the range investigated. Furthermore, an investigation of the ratio of the release wave velocity to the shock wave velocity indicates that a transition to bulk liquid (no strength) behavior is not achieved until Hugoniot strains exceed 0.35 for amorphous polymers such as Ultem. Keywords Ultem Polyetherimide PEI Shock Hugoniot Strength