Increase of stress intensity near interface edge of elastic-creep Bi-material under a sustained load |
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Authors: | Kittikorn Ngampungpis Takayuki Kitamura |
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Affiliation: | a Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan b Department of Mechanical Engineering and Science, Kyoto University, Kyoto 606-8501, Japan |
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Abstract: | The transition from small-scale creep to large-scale creep ahead of a crack tip or an interface edge with strong elastic stress singularity at the loading instant causes stress relaxation and the decrease of stress intensity in general. However, this study shows that the stress near the interface edge of bi-material with no or weak elastic stress singularity increases after the loading instant and brings about the stress concentration during the transition. In addition, the creep strain distribution of this bi-material after the loading instant is different from that occurred in the transition of an interface edge with strong elastic stress singularity or a crack tip (notch root). The criterion for the increase or decrease of stress intensity near the interface edge proved by the finite element method is proposed in this study. The stress intensity near the interface edge increases when the elastic stress singularity is lower than the creep stress singularity (λel < λcr) and vice versa. |
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Keywords: | Creep Interface edge Bi-material interface Stress intensity Small-scale creep Large-scale creep Stress relaxation Stress concentration Stress singularity |
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