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Acoustic Emission during Fracture Process of Rubber-Modified Epoxy Resin

机译：Acoustic Emission during Fracture Process of Rubber-Modified Epoxy Resin

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摘要

The growth process of damage zone around a crack tip for rubber-modified epoxy resin is investigated through the acoustic emission(AE) analysis of three-point bending specimens. The weight fractions of rubber(CTBN 1300 x 8) in rubber-modified epoxy resin are 5 wt and 15 wt. Rubber particles distributed around a crack tip and damage zone were examined by an atomic force microscope(AFM) and a polarized optical microscope. The damage zone ahead of the pre-crack tip of rubber-modified specimen(15wt rubber) began to form at about 13 level of the fracture load and grew in size until 57 load level. After that, the crack propagated in a stick-slip manner. Based on time-frequency analysis of AE signals and microscopic observation of damage zone, it was thought that AE signals with frequency bands of 0.15 ～ 0.20 MHz and 0.20 ～ 0.30 MHz were generated from cavitation in the damage zone and cracking respectively.

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