Acta Metallurgica Sinica (English Letters) ›› 2011, Vol. 24 ›› Issue (5): 405-414.DOI: 10.11890/1006-7191-115-405

• 研究论文 • 上一篇    

Evaluation of mechanical properties of structural materials by aspherical indentation based on the representative strain— An improved algorithm at great depth ratio

陈军,陈怀宁,陈静   

  1. 中国科学院金属研究所
  • 收稿日期:2011-02-25 修回日期:2011-06-24 出版日期:2011-10-25 发布日期:2011-10-18
  • 通讯作者: 陈军

Evaluation of mechanical properties of structural materials by a spherical indentation based on the representative strain--an improved algorithm at great depth ratio

Jun CHEN, Huaining CHEN，Jing CHEN   

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2011-02-25 Revised:2011-06-24 Online:2011-10-25 Published:2011-10-18
  • Contact: Huaining CHEN

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摘要： On the basis of great depth ratio, two methodologies based on the representative strain were improved to extract mechanical properties of metallic engineering structural materials from P-h curve of an indentation response. The improved aspects include: the combination of great ratio h1/R=0.1 and h2/R=0.4 replaced h1/R=0.01 and h2/R=0.06 (Cao’s method) and h1/R=0.1 and h2/R=0.3 (Ogasawara’s method); three types of metallic engineering structural materials with obviously different elastic modulus were dealt with to get their calculation parameters, respectively; a new parameter reflecting the effect of work-hardening exponent n was introduced to get the dimensionless function which is independent of n and a relationship between W/(h3σrS)and E*/(σrS) at great depth ratio. By using the results of finite element simulation, the efficiency and accuracy of the improved method have been proved, and it showed that the accuracy of the improved method is much better than former method.

Abstract: At great depth ratio, two methodologies based on the representative strain were improved to extract mechanical properties of metallic engineering structural materials from P-h curve of an indentation response. The improved aspects include: the combination of great ratio h1/R=0.1 and h2/R=0.4 replaced h1/R=0.01 and h2/R=0.06 (Cao's method) and h1/R=0.1 and h2/R=0.3 (Ogasawara's method); three types of metallic engineering structural materials with obviously different elastic modulus were dealt with to get their calculation parameters, respectively; a new parameter reflecting the effect of work-hardening exponent n was introduced to get the dimensionless function which is independent of n and a relationship between W/(h3σrS) and E*/(σrS)$ at great depth ratio. By using the results of finite element simulation, the efficiency and accuracy of the improved method have been proved, and it showed that the accuracy of the improved method is much better than the former method.

Key words: Spherical indentation, Representative strain, Metallic engineering structural material, Mechanical property, Great depth ratio