OS0314 Dissipated Energy Evaluation during Fatigue Test for 304 Stainless Steel with Thermography

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  • OS0314 SUS304鋼の疲労試験での散逸エネルギ評価(OS3-3 AE・超音波・赤外線,OS-3 非破壊評価と構造モニタリング1)

Abstract

In recent years, fatigue limit estimation method based on energy dissipation measured by infrared thermography is getting an increasing attention. In this method, temperature change due to irreversible energy dissipation during one loading cycle is measured for different levels of applied amplitude. Obtained relationship between temperature change and stress amplitude shows a significant inflection at certain stress level where temperature change due to energy dissipation shows steep increase. It is known that this stress level coincides with fatigue limit. However, mechanism of energy dissipation in relation to fatigue damage initiation has not been investigated yet. In this study, fatigue test is conducted for 304 stainless steel specimen. Temperature change due to dissipated energy, martensite fraction and strain are continuously measured to discuss energy dissipation mechanism related to plastic strain and transformation of microstructure during fatigue test.

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