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Abstract
The fracture behavior of fiber glass asphalt shingles was examined by measuring their J-integral fracture toughness at crack initiation. The corresponding fracure mechanisms were also studed by in situ fracture observation and by scanning electron microsopy. The applicability of using J-integral fracture toughness to characterize asphalt shingles was discussed and its relationships to other mechanical properties was established. The results indicated that the fracture toughness at crack initiation can be accurately measured for fiber glas shingles and the vaules may be used ot characterize their cracking resistance. Frature toughness measured from various shingle samples was found to correlate to the shingle's tensile toughness and to its tear strength. Preliminary resultas on fracture mechanisms suggested that failure in the asphat coarings by micro-cavitation may be the controlling event leadking to crack advance. The imporance of the glass fiber mat on the shingle's resistance to fracure was also discussed.
The fracture behavior of fiber glass asphalt shingles was examined by measuring their J-integral fracture toughness at crack initiation. The corresponding fracure mechanisms were also studed by in situ fracture observation and by scanning electron microsopy. The applicability of using J-integral fracture toughness to characterize asphalt shingles was discussed and its relationships to other mechanical properties was established. The results indicated that the fracture toughness at crack initiation can be accurately measured for fiber glas shingles and the vaules may be used ot characterize their cracking resistance. Frature toughness measured from various shingle samples was found to correlate to the shingle's tensile toughness and to its tear strength. Preliminary resultas on fracture mechanisms suggested that failure in the asphat coarings by micro-cavitation may be the controlling event leadking to crack advance. The imporance of the glass fiber mat on the shingle's resistance to fracure was also discussed.
Date
0/1999
0/1999
Author(s)
Ming Shiao
Ming Shiao
Page(s)
132-
132-
Keyword(s)
shingle; asphalt coat; glass fiber felt; cracking; splitting; fracture toughness; J intergral
shingle; asphalt coat; glass fiber felt; cracking; splitting; fracture toughness; J intergral