号数 ばね論文集 62 号( 2017 年)
ページ数 pp.15-18
種類 論文
論文名 低炭素鋼の引張り塑性ひずみによる非線形超音波特性の変化
Title The Variation of Tensile Plastic Strain Induced Nonlinear Acoustic Characteristics in Low-Carbon Steel
著者 大谷俊博1),石川皓崇1),石井 優1),榊原隆之2) 
Author Toshihiro OHTANI1), Akitaka ISHIKAWA1), Yutaka ISHII1) Takayuki SAKAKIBARA2) 
抄録  
Abstract We investigated the characteristics of nonlinear acoustic resonant frequency shift and three-wave mixing interaction during tensile test for low-carbon steel of S25C with electromagnetic acoustic resonance (EMAR). EMAR is the application of a resonant acoustic technique with a non-contact electromagnetic acoustic transducer (EMAT). We used bulk- shear-wave EMAT, which transmits and receives shear wave propagating in thickness direction of a plate specimen. Nonlinear acoustic parameter variation has indicated incremental behavior in relation to the plastic strain, and reached to the peak value between lower yield strength strain and tensile strength strain. Those characteristics are corresponding to the dislocation densities measured by X-ray. 
著者の所属 1)湘南工科大学
2)中央発條株式会社 
Belonging 1)Shonan Institute of Technology
2)Chuo Spring Co.,Ltd. 
Key Words Nonlinear ultrasonics, Electromagnetic acoustic resonance, low carbon steel, Plastic strain,Dislocation.