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Low velocity surface fracture patterns and energies in poly(methyl methacrylate)
Author(s) -
Osborne P. W.
Publication year - 1975
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760151206
Subject(s) - fracture (geology) , materials science , laminar flow , surface (topology) , composite material , poly(methyl methacrylate) , methyl methacrylate , fracture mechanics , mechanics , geometry , polymer , physics , copolymer , mathematics
Steady‐state fracture techniques were used to investigate the surface fracture patterns and surface fracture energies of poly(methyl methacrylate) at low velocities (10 cm/sec to 10 −5 cm/sec). Several anomalies were discovered: (1) Small surface cracks, running parallel to the crack front, which were initiated by imperfections; (2) a “zero velocity” transition from the normal surface fracture patterns to a “laminar” pattern; and (3) a subsequent transition from the laminar pattern to a “turbulent” pattern. The velocities at which these anomalous fracture patterns occurred were of the order of 10 −4 to 10 −6 cm/sec. The corresponding surface fracture energies were as low as 10 5 erg/cm 2 .