日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 78, No. 1 (2014),
pp. 16-22

Evaluation of Applicability on Multi-Axis Residual Stress Formed by Hard Sphere Indentation for Stress Corrosion Cracking Test

Ikuo Ioka1, Kiyoshi Kiuchi1, Masayuki Takizawa2 and Takeshi Ito3

1Japan Atomic Energy Agency, Naka-gun Ibaraki 319-1195
2Mitsubishi Research Institute, Inc., Tokyo 100-8141
3Kaken, Inc., Mito 310-0903

Abstract:

A multi-axis stress field is indispensable for quick and quantitative evaluation of stress corrosion cracking for constructional materials and weld joints of existing industrial plants. The applicability of multi-axis residual stress field formed by pushing of a hard sphere ball made of WC into stress corrosion cracking tests was evaluated.
The Brinell type hard sphere ball was stuffed into small flat-plate of type 304SS. The residual stress and displacement around the indentation were measured using an X-ray diffraction method and a displacement meter. Numerical analysis by the finite element method was conducted in order to compare with the experimental results. The numerical analysis was comparatively in agreement with the experimental results. A hard sphere ball diameter, a specimen holder hole diameter, specimen thickness, and an indentation depth were selected by numerical analysis to optimize the residual stress of specimen. The stress corrosion cracking test in chloride solution was performed using the specimen with optical residual stress condition. It is confirmed that the multi-axis residual stress field was useful in quick and quantitative stress corrosion cracking test by comparing the initiation of cracks with the distribution of residual stress obtained by numerical analysis. [doi:10.2320/jinstmet.J2013061]


(Received 2013/8/26)

Keywords:

stress corrosion cracking, indentation techniques, Brinell type hard sphere ball, multi-axis residual stress, numerical analysis


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