Strain Concentration at Structural Discontinuities and Its Prediction Based on Characteristics of Compliance Change in Structures

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概要

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• Elevated temperature structural design codes pay attention to strain concentration at structural discontinuities due to creep and plasticity, since it causes an increase in creep-fatigue damage of materials. One of the difficulties in predicting strain concentration is its dependence on the magnitude of loading, the constitutive equations, and the duration of loading. In this study, the author investigated the fundamental mechanism of strain concentration and its main factors. The results revealed that strain concentration is caused by strain redistribution between elastic and inelastic regions, which can be quantified by the characteristics of structural compliance. The characteristics of structural compliance are controlled by elastic region in structures and are insensitive to constitutive equations. It means that inelastic analysis can be easily applied to obtain compliance characteristics. By utilizing this fact, a simplified inelastic analysis method was proposed based on the characteristics of compliance change for the prediction of strain concentration.

• 一般社団法人日本機械学会の論文
• 2001-07-15

著者

• Kasahara Naoto

  Oarai Engineering Center Japan Nuclear Cycle Development Institute

関連論文

• Proposal of a Strain Concentration Model of Welded Joints for Creep-Fatigue Evaluation of Welded Structures
• SA-12-3(006) Strain Concentration Mechanism during Stress Relaxation Process and its Prediction(Inelastic Modeling & Analysis 2)
• Strain Concentration at Structural Discontinuities and Its Prediction Based on Characteristics of Compliance Change in Structures

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