Influence of Water Uptake on Dynamic Fracture Behavior of Poly(Methyl Methacrylate)

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• 作者：O. Delpino Gonzales ; V. Eliasson
• 关键词：PMMA ; Dynamic loading ; Caustics ; Humidity ; Crack propagation
• 刊名：Experimental Mechanics
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：56
• 期：1
• 页码：59-68
• 全文大小：2,021 KB
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• 作者单位：O. Delpino Gonzales (1)
  V. Eliasson (1)
  
  1. Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, CA, 90089-1189, USA
  
• 刊物类别：Engineering
• 刊物主题：Mechanical Engineering
  Theoretical and Applied Mechanics
  Characterization and Evaluation Materials
  Structural Mechanics
  Engineering Fluid Dynamics
  Engineering Design
  
• 出版者：Springer Boston
• ISSN：1741-2765

文摘

A study was completed to assess the effects of various humidity levels and amount of sorbed water on the fracture behavior of notched poly(methyl methacrylate) (PMMA) samples subjected to stress pulses generated by the impact of a projectile launched from an air gun. Impact experiments were performed on six sets of samples conditioned in different environments: dry samples; samples exposed to three different relative humidity environments (11 %, 60 %, and 98 %) using saturated salt solutions (Lithium Chloride, Sodium Bromide, and Potassium Sulfate, respectively); and distilled water- and seawater-exposed samples. Experiments varied by immersion time and water content, while loading conditions were kept constant. The main goal of this study was to understand the effects of sorbed water on the fracture behavior of PMMA when subjected to high strain rate impacts. It was observed that when PMMA is subjected to strain rates of 102 s −1, the effect of water content is not a dominant mechanism on the crack initiation and crack-tip speed of PMMA.