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고분자재료의 Cavitation Erosion 손상에 관한 연구

A Study on the Cavitation Erosion of Polymeric Materials

김기주 김동섭

Kim KJ Kim DS

HWAHAK KONGHAK, February 1994, 32(1), 72-78(7), NONE

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Abstract

순수중에서 각종 고분자재료에 대하여 자기압축식 진동장치를 이용한 cavitation erosion 실험을 행하였다. 고분자재료의 손상량은 일정 시간마다 직시천칭을 이용하여 측정하였으며, 그 손상거동 및 기구는 광학 및 주사형 전자현미경을 이용하여 관찰하였다. 고분자재료의 손상속도는 시간의존성을 나타내며, 진폭이 증가할수록 증대하였다. 또 불포화 폴리에스테르수지나 지환식 에폭시수지는 crack 의 발생과 성장에 의한 취성적인 손상기구를 나타내지만, 폴리프로필렌, PEEK등은 소성변형이 선행되어 포화상태에 달한 후 인열 등에 의해 손상이 일어나는 연성적인 손상기구를 나타내었다. 한편 고분자재료의 내erosion성은 취성적인 손상기구를 나타내는 재료는 파괴인성치와, 연성적인 손상기구를 나타내는 재료는 결정화도와 좋은 상관성을 보였다.

The cavitation erosion tests of polymeric materials were made by using a magnetostriction vibratory apparatus in pure water. The results were as following : (1)The erosion rate of polymeric materials depends on the test time and increases as the amplitude of the vibration is increased. (2)Alicyclic epoxy resin and orthophthalic unsaturated polyester resin shows brittle fracture caused by the formation and growth of cracks while polypropylene and polyetherether ketone(PEEK) shows ductile fracture caused by plastic deformation and tearing. (3) It is also noted that the erosion resistance of the brittle materials shows a good correlation with fracture toughness, and that of the ductile materials is also correlated well with the degree of crystallinity.

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References

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