The fracture behavior of a thermosetting polymer, epoxy resin, under the effect of static and impact tensile loading was studied using single-edge-cracked specimens. The static and dynamic loads were determined using a load cell and a piezo sensor, respectively, and the displacement of the specimen was measured using a high-speed extensometer. From the load-displacement diagram, the external work (
Uex) applied to the specimen was used to evaluate the elastic energy (
Ee) and nonelastic energy (
En) due to viscoelastic and plastic deformation, and the fracture energy (
Ef) for creating a new fracture surface (
As). The energy release rate was then estimated using
Gf =
Ef⁄
As, and the values of
Gf were correlated with the fracture load (
Pc). The result indicated that although
Gf increased with
Pc for both tests, the impact test showed much lower values than the static test.
抄録全体を表示