Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (1): 82-87.DOI: 10.12068/j.issn.1005-3026.2019.01.016

• Mechanical Engineering • Previous Articles     Next Articles

Quantitative Analysis of Fracture Surface Defect and Its Effect on Strength of Connecting Rod

SHI Zhou1,2, KOU Shu-qing1,2   

  1. 1. Roll Forging Research Institute, Jilin University, Changchun 130025, China; 2. College of Materials Science and Engineering, Jilin University, Changchun 130025, China.
  • Received:2017-10-27 Revised:2017-10-27 Online:2019-01-15 Published:2019-01-28
  • Contact: KOU Shu-qing
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Abstract: The fracture joint surface was obtained by the fracture-split test and the fracture surface was reconstructed by reverse engineering. The connecting rod model with defect was built. The quantitative description of the fracture surface defect was realized. The effects of fracture surface defect of different sizes and positions on the strength of the connecting rod were explored, and the control standard of the relevant dimension in the processing process was formulated. The rules were obtained: with the defect size increasing, the stress of the connecting rod increases gradually and the strength of the connecting rod decreases. When the defect area is larger, the influence on the stress of the connecting rod becomes more significant. The stress of the connecting rod is greater when defect is inside the joint surface than that at the edge of the joint surface. In order to ensure the strength of the connecting rod, the defect size should meet: defect on edge, when 1.5mm<b<2.5mm, a≤-1.125b+5.0875; in-plane defect, when 1.4mm<b<2.1mm, a≤-1.143b+4.8.

Key words: connecting rod fracture-split, fracture surface, defect, quantitative description, strength, control standard

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