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CaCO3 / PP 입자 강화 복합재료의 온도변화에 따른 파괴기구
고성위,김형진 한국어업기술학회 1994 수산해양기술연구 Vol.30 No.3
In this paper the failure mechanisms of polypropylene resin composites filled with calcium carbonate particulates have been studied in the temperature range -50℃ to -50℃ The fillers used are both untreated and surface treated with stearic acid. The impact fracture toughness is evaluated from the impact energy absorbed divided by the uncut ligament area of the specimen. Impact fracture toughness increases as temperature is raised whether the fillers are coated or not. The static fracture toughness of these particular composites is evaluated based on the linear clastic fracture toughness of these particular composites is evaluated based on the linear clastic fracture mechanics. Static fracture toughess decreases with increasing temperature whether the fillers are coated or not. An extended stress whitened zone are observed through a large number of availabel sites for cavitation/debonding along particle matrix interface and matrix deformation.
고성위,송삼홍 고려대학교 공학기술연구소 1984 고려대학교 생산기술연구소 생기연논문집 Vol.19 No.1
In this paper, fracture behavior and stress distribution around slot or notch of slotted or notched plate which is subjected to uniaxial tensile load are studied. The experimental measurements have shown the following; (1) The stress around slot or notch of slotted or notched plate which is subjected to uniaxial tensile load is state of biaxial stress, which is mainly varied to notch radius and depth. (2) The stress concentration factor around slot or notch is mainly influenced by the σ_(yy), which is varied with notch radius and depth. (3) Crack intiates from micro zone on surrounding of notch and slot end by shear stress.