TY - JOUR
T1 - Tensile fracture behavior of a biodegradable polymer, poly(lactic acid)
AU - Arakawa, Kazuo
AU - Mada, Toshio
AU - Park, Sang Dae
AU - Todo, Mitsugu
N1 - Funding Information:
This research was supported by Grant-in-aid from Japan Society for the Promotion of Science (Grant nos.15360059 and 16560074).
PY - 2006/8
Y1 - 2006/8
N2 - The stable and dynamic fracture behavior of a biodegradable polymer, poly(lactic acid) (PLA), was investigated using single-edge-cracked tensile specimens. To study the dynamic effect of brittle facture, the specimens were pin-loaded using a special jig that allowed them to split and fly off in the loaded direction after fracture. The non-elastic effect of viscoelastic and plastic deformations was also measured using an optical high-speed extensometer, which consisted of an optical fiber and a position-sensing detector (PSD). For the stable and dynamic fracture process, external work applied to the specimen and its fracture surface was partitioned into Us and Ud, and As and Ad, respectively. The energy release rate, Gs, for stable crack growth was determined using Us/As. The kinetic and non-elastic energies were measured and subtracted from Ud to evaluate the fracture energy for the dynamic process, Ef. The dynamic energy release rate, Gf, was then determined as Ef/Ad. Gd was also obtained as Ud/Ad to correlate with Gs and Gf, and the results are discussed.
AB - The stable and dynamic fracture behavior of a biodegradable polymer, poly(lactic acid) (PLA), was investigated using single-edge-cracked tensile specimens. To study the dynamic effect of brittle facture, the specimens were pin-loaded using a special jig that allowed them to split and fly off in the loaded direction after fracture. The non-elastic effect of viscoelastic and plastic deformations was also measured using an optical high-speed extensometer, which consisted of an optical fiber and a position-sensing detector (PSD). For the stable and dynamic fracture process, external work applied to the specimen and its fracture surface was partitioned into Us and Ud, and As and Ad, respectively. The energy release rate, Gs, for stable crack growth was determined using Us/As. The kinetic and non-elastic energies were measured and subtracted from Ud to evaluate the fracture energy for the dynamic process, Ef. The dynamic energy release rate, Gf, was then determined as Ef/Ad. Gd was also obtained as Ud/Ad to correlate with Gs and Gf, and the results are discussed.
UR - http://www.scopus.com/inward/record.url?scp=33746349311&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33746349311&partnerID=8YFLogxK
U2 - 10.1016/j.polymertesting.2006.04.004
DO - 10.1016/j.polymertesting.2006.04.004
M3 - Article
AN - SCOPUS:33746349311
SN - 0142-9418
VL - 25
SP - 628
EP - 634
JO - Polymer Testing
JF - Polymer Testing
IS - 5
ER -