Fracture Failure Analysis on 20MnTiB Steel High-Strength Bolt Used in Bridges

  • Lan Liu
  • Juan WenEmail author
  • Qingcai Liu
  • Lin Chen
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


The fracture failure of 20MnTiB steel high-strength bolts in some bridges occurred. To reveal the reason for the fracture failure of the high-strength bolts, macroscopic analysis, chemical analysis, phase analysis, microscopic analysis, and metallographic analysis were carried out on one of the failed high-strength bolts. The results show that the corrosion products on the fracture surface of the failed high-strength bolt are mainly composed of SiO2, Fe2O3, and Al2O3 and contain the elements S and Cl by energy spectrum analysis. The fracture analysis of the failed high-strength bolt shows that it had two crack sources, one was outward expansion caused by the notch, and the final fracture turned out tongue pattern, while the other was outward expansion in the form of branches, and the final fracture turned out intergranular fracture morphology. It can be deduced that the main cause of the high-strength bolt fracture is machining defects and stress corrosion.


20MnTiB High-strength bolt Fracture failure 



The authors are grateful for the support from Chongqing Key Laboratory of Energy and Environment Engineering and Chongqing Cheng Tou Road and Bridge Administration Co. Ltd.


  1. 1.
    Berman JW, Wang BS, Olson AW (2012) Rapid assessment of gusset plate safety in steel truss bridges. J Bridge Eng 17(2):221–231CrossRefGoogle Scholar
  2. 2.
    Berman JW, Wang BS, Roeder CW (2010) Triage evaluation of gusset plates in steel truss bridges. Load factorGoogle Scholar
  3. 3.
    Li Y, Wang H, Zhang Y (2013) Analysis on local mechanical properties of high strength bolt gusset joints in steel trussed girder bridges. J Shijiazhuang Tiedao Univ Nat Sci 26(03):1–7Google Scholar
  4. 4.
    Zhou L, Wang C, Li J (2007) Damage analysis of continuous steel truss bridge on railway. SiChuang Archit S1:104–105Google Scholar
  5. 5.
    Meng W, Zeng W, Gu J, Chen X, Liu J (2017) Failure analysis on early fatigue fracture of a 109 grade bolt. Phys Test Chem Anal Part A Phys Test 53(05):365–367Google Scholar
  6. 6.
    Shi K, Li Z, Liu Y (2018) Failure analysis of bolts. Metal Working Hot Working 06:81–84Google Scholar
  7. 7.
    Li M, Chenghao P, Li C, Pan L (2017) Fracture failure analysis on 35VB steel high strength bolt. Hot Working Technol 46(18):259–263Google Scholar
  8. 8.
    Li GD, Li N (2017) The research on delayed fracture behavior of high-strength bolts in steel structure. Mater Sci Eng Conf SerGoogle Scholar
  9. 9.
    Zhang J, Li A, Zhang C (2016) Failure and fracture analysis of bolt assembled on the fan used in the internal combustion engine. J Fail Anal Prev 16(2):302–309CrossRefGoogle Scholar
  10. 10.
    Song X, Jiang X, Dong L (2017) Fracture mechanism and countermeasure of cylinder cover bolt in a make-up gydrogen compressor. Corros Prot 38(11):894–897Google Scholar
  11. 11.
    Lin Q, Yang X (2009) Fracture analysis of a high strength bolt. Hot Working Technol 38(2):128–130Google Scholar
  12. 12.
    Liu M (2018) Fracture failure analysis of high pressure bolt. Petro-chem Equip 47(3):78–81Google Scholar
  13. 13.
    W Juan, L Zheng, H Tao, L Lan (2018) Simple analysis on failure of high strength bolts in Chongqing Chaotianmen Bridge. Mater Sci EngGoogle Scholar
  14. 14.
    Winkler EM (1970) The importance of air pollution in the corrosion of stone and metals. Eng Geol 4:327–334CrossRefGoogle Scholar
  15. 15.
    Cheng X, Zhang G, Li X (2018) Effects of suspended particulates on atmospheric environmental corrosion by mathematical analysis. Science China Press 48(4):395–402Google Scholar

Copyright information

© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  1. 1.College of Material Science and EngineeringChongqing UniversityChongqingPeople’s Republic of China
  2. 2.Chongqing Cheng Tou Road and Bridge Administration Co. LtdChongqingPeople’s Republic of China

Personalised recommendations