Mode I Fracture Characterization of Bituminous Paving Mixtures at Intermediate Service Temperatures

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• 作者：F. T. S. Arag?o (1)
  Y.-R. Kim (2)
  
• 关键词：Bituminous paving mixtures ; Fracture ; Viscoelasticity ; Cohesive zone ; Digital image correlation
• 刊名：Experimental Mechanics
• 出版年：2012
• 出版时间：November 2012
• 年：2012
• 卷：52
• 期：9
• 页码：1423-1434
• 全文大小：882KB
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• 作者单位：F. T. S. Arag?o (1)
  Y.-R. Kim (2)
  
  1. Department of Civil Engineering, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
  2. Department of Civil Engineering, 224 Engineering Building, Kyung Hee University, Yongin-si, Gyeonggi-do, 446-701, South Korea
  
• ISSN：1741-2765

文摘

This study presents an integrated approach combining experimental tests and numerical modeling to characterize mode I fracture behavior of bituminous paving mixtures subjected to a wide range of loading rates at intermediate temperature conditions. A simple experimental protocol is developed using the semi-circular bending (SCB) test geometry. The local fracture behavior at the initial notch tip of the SCB specimens is monitored using high-speed cameras with a digital image correlation (DIC) system. The DIC results of the SCB fracture tests are then simulated using a finite element method that is incorporated with material viscoelasticity and cohesive zone fracture. Fracture properties are obtained locally at the notch tip by identifying two cohesive zone fracture parameters (cohesive strength and fracture energy) that result in a good agreement between test results and numerical simulations. The results clearly present significant rate-dependent fracture characteristics of bituminous paving mixtures at intermediate service temperatures. This study further demonstrates that fracture properties of viscoelastic materials need to be characterized at the local fracture process zone when they present ductile fracture behavior.