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In this study, the effect of fluid flow rate, surface roughness and strain level on the corrosion behavior of magnesium alloy AZ31 was characterized in a custom test bench. Specimens were prepared by mechanical polishing and subject to flow in a simulated body fluid at 37°C for 24 hrs. Compared to a specimen pre-strain of 0%, mass loss was shown to increase by approximately 6% with a specimen pre-strain of 10%. Similarly, mass loss increased by approximately 13% when the fluid flow rate was increased from 250ml/min to 500ml/min. Surface roughness had a significant influence on corrosion behavior. Compared to a specimen polished with a 1 µm diamond paste, the mass loss for a specimen polished with #600 sandpaper was 28% greater.

Higb−temperat 田 ・ e plants ， such as nuclear and thermal power p 監 ants are used under severe condltio 皿 s ． Higb temperature plants are susceptible to rnicro − cracks in its structure ． This is because there is the effect ofcyclic fatigue and creep fatigue ． To prevent serious accidents ， induding small defectg ． in the structure ， we predicted the destruction ， we must use safely ． In particular ， the evaluation of fatiguc crack is impo 震ant ． In this study ， we analyzed the J ・ integral using the virtual crack extensiQn metho 虔 a 皿 d 五nite e 互 ement method ． Analysis model is a two ・ dimensional flat plate with a crack in the center ， it is assumed that the load on fatigue ． MoreQver ， we examine the effect of the amount ef virtual crack extensien used in the analysis ．

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