期刊
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
卷 44, 期 3, 页码 832-846出版社
WILEY
DOI: 10.1111/ffe.13398
关键词
asphalt mixture; fracture toughness ratio prediction; K-Ic and K-IIc value; low temperature; symmetric and asymmetric SCB specimens; thickness effect
资金
- National Natural Science Foundation of China [51578343]
- Natural Science Foundation of Guangdong Province [2018A030313499]
The research experimentally and theoretically investigated the pure mode I and mode II fracture toughness of asphalt mixture, showing that reducing test temperature increases fracture toughness and 50mm thickness is more suitable for fracture study, with mode II specimen fracture load significantly greater than mode I load.
Pure mode I and mode II fracture toughness of asphalt mixture was investigated both experimentally and theoretically using vertical edge crack semicircular bend (SCB) specimen with symmetric and asymmetric bottom loading spans. The thickness of SCB specimen was considered in the range from 30 to 70 mm, and the fracture toughness tests were performed at three subzero temperatures (-5 degrees C, -15 degrees C and -25 degrees C). The results showed that K-Ic and K-IIc are increased by reducing the test temperature. The thickness had no sound effect on the fracture toughness, but the thickness of 50 mm was more suitable for fracture study on this material. The fracture load of mode II specimen was significantly greater than the mode I fracture load at the same testing condition. The fracture toughness ratio (K-IIc/K-Ic) that varies in the range between 1 and 1.4 was predicted theoretically using three well-known stress/strain-based fracture criteria.
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