Asphalt complex cracks' sensitivity to temperature and crack depth and adjustment of the composite stress intensity factor. (December 2022)

• Record Type: Journal Article
• Authors: Xiao, Minmin; Li, Chunyan; Zhu, Xingyi; Yang, Liming; Dong, Jinyong
• Is Part Of: Theoretical and applied fracture mechanics. Volume 122(2022)
• Publication Date: 2022-12
• Subjects: Asphalt pavement -- Fracture mechanics -- Composite stress intensity factor -- Crack depth -- Complex cracks; Fracture mechanics -- Periodicals; 620.1126
• DOI: 10.1016/j.tafmec.2022.103628
• Languages: English
• ISSNs: 0167-8442

Abstract

Highlights: Crack depths as well as the growth laws of the three fundamental categories of stress intensity variables in asphalt mixtures at various temperatures were examined. It is explored how much each type of stress intensity element affects complicated cracking. The temperature influence factor and the crack depth influence factor of asphalt mixture in complicated cracks are two new mechanical indicators that are developed and suggested. To create the amended calculation formula, the two additional indices are added to the complicated stress intensity factor formula. The challenge of calculating the composite stress intensity factor under conditions of varying temperature and varied fracture depth in real-world applications has been resolved. Abstract: This paper is based on the fracture mechanics K-criterion with the composite stress intensity factor solution formula. The influence of temperature and depth in developing complex crack instability and diffusion in asphalt pavements is investigated. The crack composite stress intensity factor and development pattern are analyzed. The finite element modeling analyzes the change in stress intensity factor values at different temperatures and cracks depths. The composite stress intensity factor's temperature effect factor (t*) and crack depth effect factor (d*) are derived, and the calculation formulae are optimized. The study results show that among the complex cracks in asphalt pavements, the type I crack tip stress intensity factor (KⅠ ) is the most seriously affected by temperature and crack depth and is also the main controlling factor of crack development. Type II crack tip stress intensity factor (KⅡ ) is not significantly influenced by temperature but tends to rise and fall as the crack depth increases. Type III crack tip stress intensity factor (KIII ) is smaller than KⅠ and KⅡ . It has less influence on the development of complex cracks in asphalt pavements. t* and d* were introduced to derive the formula for the modified composite stress intensity factor (Keff *). The formula was verified to calculate the composite stress intensity factor at different temperatures and crack depths and to study the cracking pattern of asphalt pavements.