吉林大学学报(工学版) ›› 2010, Vol. 40 ›› Issue (04): 1005-1008.

• paper • Previous Articles     Next Articles

Lifespan of relaxed high toughness spheroidal-graphite cast iron after retightening under conditions of variable high temperature and plasticity

DAI Su-jiang1,ZHANG Wei-zheng2,YUAN Yan-peng2,ZHAO Wei-mao2   

  1. 1.Jinhua College of Profession and Technology, Jinhua 321000, China；2.School of Mechanical and Vehicle Engineering, Beijing Institute of Technology, Beijing 100081, China
  • Received:2008-12-31 Online:2010-07-01 Published:2010-07-01

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Abstract:

The relaxing-retightening characteristics and the lifespan prediction of the high toughness spheroidal graphite cast iron under the conditions of variable high temperatures and plasticity were investigated experimentally. A model for its relaxingretightening lifespan prediction was built and the calculation analyses were performed to explore the working behavior and the lifespans after repeated relaxingretightening. The results show that an exponential relationship exists between the equivalent failure energy and the cycle number before failure, and the predicted lifespan is related to both the pretightening load and the initial extension.

Key words: metallic material, high toughness spheroidal-graphite cast iron, relaxation retightening, high-temperature plasticity, lifespan

CLC Number: 

  • TB302.3
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