Torsion Failure Analysis of Galvanized Steel Wires for Transmission and Distribution Lines Based on ANSYS Numerical Simulation

doi:10.1007/s12204-019-2112-4

摘要/Abstract

摘要： This study provides a detailed failure analysis of galvanized steel wires (3mm in diameter) for a 35 kV transmission and distribution line, which was carried out by combining the conventional material analysis methods with the finite element method (FEM). It is found that the failed material had good plasticity (5% in elongation), and under the soft torsion loading condition (0.75 in stress state soft coefficient), the ductile fracture should occur on the material. Additionally, the theoretical number of torsions calculated by the FEM was 26.2 times, while the actual number of torsions achieved by the test was only 2.2 times and the local fracture surface exhibited brittle fracture characteristics. The results showed that the local torsion brittle fracture of the material with good plasticity was caused by triaxial stress in the torsion condition, which led to the formation of cavity in the pulling stress area in the material’s center, and the finite element calculation results indicated that the stress state soft coefficient at the cavity was distributed between 0.31 and 0.38, and the stress concentration at the cavity was more than twice the normal value. Besides, the Widmanstatten structure formed as the improper hot working process is the corresponding structural reason.

关键词: galvanized steel wire, torsion brittle fracture, triaxial stress state, cavity rupture, finite element method (FEM)

Abstract: This study provides a detailed failure analysis of galvanized steel wires (3mm in diameter) for a 35 kV transmission and distribution line, which was carried out by combining the conventional material analysis methods with the finite element method (FEM). It is found that the failed material had good plasticity (5% in elongation), and under the soft torsion loading condition (0.75 in stress state soft coefficient), the ductile fracture should occur on the material. Additionally, the theoretical number of torsions calculated by the FEM was 26.2 times, while the actual number of torsions achieved by the test was only 2.2 times and the local fracture surface exhibited brittle fracture characteristics. The results showed that the local torsion brittle fracture of the material with good plasticity was caused by triaxial stress in the torsion condition, which led to the formation of cavity in the pulling stress area in the material’s center, and the finite element calculation results indicated that the stress state soft coefficient at the cavity was distributed between 0.31 and 0.38, and the stress concentration at the cavity was more than twice the normal value. Besides, the Widmanstatten structure formed as the improper hot working process is the corresponding structural reason.

Key words: galvanized steel wire, torsion brittle fracture, triaxial stress state, cavity rupture, finite element method (FEM)

中图分类号:

TM 244.1

WANG Man (王曼), ZHANG Xiaomin (张晓敏), LONG Peng (龙鹏), JIANG Yu (蒋渝). Torsion Failure Analysis of Galvanized Steel Wires for Transmission and Distribution Lines Based on ANSYS Numerical Simulation[J]. Journal of Shanghai Jiao Tong University (Science), 2019, 24(5): 632-639.

参考文献 25

[7]	ATIENZA J M, ELICES M, RUIZ-HERVIAS J, et al.Residual stresses and durability in cold drawn eutectoidsteel wires [J]. Metals and Materials International,2007, 13(2): 139-143.
[8]	HU X J, WANG L, FANG F, et al. Origin and mechanismof torsion fracture in cold-drawn pearlitic steelwires [J]. Journal of Materials Science, 2013, 48(16):5528-5535.
[1]	ZHANG H, WANG Y F, HE D, et al. Overview of situation,problems and suggestions of disaster preventionand mitigation in power systems [J]. Power SystemTechnology, 2016, 40(9): 2838-2844 (in Chinese).
[2]	BELYAEV A, IVANOVSKY R, KARPOV Y, et al.Electrical grid and risk assessment [C]// 4th InternationalScientific Symposium on Electric Power Engineering.Stara Lesna, Slovakia: Technical Universityof Kosice, 2007: 612-616.
[9]	GOES B, MARTIN-MEIZOSO A, GIL-SEVILLANOJ, et al. Fragmentation of As-drawn pearlitic steelwires during torsion tests [J]. Engineering Fracture Mechanics,1998, 60(3): 255-272.
[10]	ZHOU J M, LI J C. Effect of axial tension load ontwist number of steel wire in torsion test [J]. PhysicsExamination and Testing, 1992 (4): 50-53 (in Chinese).
[3]	Standardization Administration of the People’s Republicof China. Zinc-coated steel wires for strandedconductors: GB/T 3428—2012 [S]. Beijing: StandardsPress of China, 2012 (in Chinese).
[11]	ZHAO T Z, ZHANG G L, ZHANG S H, et al. Fracturecharacteristics of fully pearlitic steel wire in tensionand torsion [J]. Journal of Iron and Steel ResearchInternational, 2016, 23(11): 1206-1212.
[4]	YAO H D, ZHU Y G, XIAO Z R, et al. Influencingfactor of drawing steel wire torsion performance [J].Metal Products, 2015, 41(2): 22-26 (in Chinese).
[5]	LI G Z, ZHANG J F, WANG Y Y. Cause analysisaffecting torsion property of galvanized steel wire [J].Steel Wire Products, 2007, 33(5): 5-7 (in Chinese).
[12]	SUZUKI Y, ASAKAWA M, MIZUNO H, et al. Generatinga mechanism of delamination in high carbonsteel wire by experimental drawing [J]. Wire JournalInternational, 2005, 38(10): 70-72.
[6]	CORDIER-ROBERT C, FORFERT B, BOLLE B, etal. Influence of torsion deformation on microstructureof cold-drawn pearlitic steel wire [J]. Journal of MaterialsScience, 2008, 43(4): 1241-1248.
[13]	KENICHI S, NOZOMU K. Fracture mechanics aspectsof delamination occurrence in high-carbon steel wire[J]. Wire Journal International, 2002, 35(3): 88-97.
[7]	ATIENZA J M, ELICES M, RUIZ-HERVIAS J, et al.Residual stresses and durability in cold drawn eutectoidsteel wires [J]. Metals and Materials International,2007, 13(2): 139-143.
[14]	GELFI M, SOLAZZI L, POLI S. Influence of the manufacturingprocess on defects in the galvanized coatingof high carbon steel wires [J]. Materials, 2017,10(3): 264.
[8]	HU X J, WANG L, FANG F, et al. Origin and mechanismof torsion fracture in cold-drawn pearlitic steelwires [J]. Journal of Materials Science, 2013, 48(16):5528-5535.
[15]	VAGGE S T, RAJA V S, NARAYANAN R G. Effectof deformation on the electrochemical behavior of hotdipgalvanized steel sheets [J]. Applied Surface Science,2007, 253(20): 8415-8421.
[9]	GOES B, MARTIN-MEIZOSO A, GIL-SEVILLANOJ, et al. Fragmentation of As-drawn pearlitic steelwires during torsion tests [J]. Engineering Fracture Mechanics,1998, 60(3): 255-272.
[16]	SINGH J K, SINGH D D N. Studies on defects ingalvanized coating on steel wire [J]. Indian Journal ofChemical Technology, 2012, 19(5): 361-365.
[10]	ZHOU J M, LI J C. Effect of axial tension load ontwist number of steel wire in torsion test [J]. PhysicsExamination and Testing, 1992 (4): 50-53 (in Chinese).
[17]	Standardization Administration of the People’s Republicof China. Test methods for bare wires—Part 4:Torsion test: GB/T 4909.4—2009 [S]. Beijing: StandardsPress of China, 2009 (in Chinese).
[11]	ZHAO T Z, ZHANG G L, ZHANG S H, et al. Fracturecharacteristics of fully pearlitic steel wire in tensionand torsion [J]. Journal of Iron and Steel ResearchInternational, 2016, 23(11): 1206-1212.
[18]	XU H Y, ZHANG C H. Finite element analysis of rollerbearing based on the plastic material models [J]. Journalof Mechanical Engineering, 2010, 46(11): 29-35 (inChinese).
[12]	SUZUKI Y, ASAKAWA M, MIZUNO H, et al. Generatinga mechanism of delamination in high carbonsteel wire by experimental drawing [J]. Wire JournalInternational, 2005, 38(10): 70-72.
[19]	WANG X M. Numerical analysis of ANSYS engineeringstructure [M]. Beijing: China CommunicationsPress, 2007 (in Chinese).
[13]	KENICHI S, NOZOMU K. Fracture mechanics aspectsof delamination occurrence in high-carbon steel wire[J]. Wire Journal International, 2002, 35(3): 88-97.
[20]	SIMA A P. Influence of stress triaxiality on materialfracture [D]. Shanghai: Shanghai Jiao Tong University,2009 (in Chinese).
[14]	GELFI M, SOLAZZI L, POLI S. Influence of the manufacturingprocess on defects in the galvanized coatingof high carbon steel wires [J]. Materials, 2017,10(3): 264.
[21]	HU S Y. Manual of mechanical failure analysis [M].Chengdu: Sichuan Science and Technology Press, 1989(in Chinese).
[22]	Standardization Administration of the People’s Republicof China. Steel——Determination of microstructure:GB/T 13299—1991 [S]. Beijing: StandardsPress of China, 1991 (in Chinese).
[15]	VAGGE S T, RAJA V S, NARAYANAN R G. Effectof deformation on the electrochemical behavior of hotdipgalvanized steel sheets [J]. Applied Surface Science,2007, 253(20): 8415-8421.
[16]	SINGH J K, SINGH D D N. Studies on defects ingalvanized coating on steel wire [J]. Indian Journal ofChemical Technology, 2012, 19(5): 361-365.
[23]	LUO S M. Study on key techniques of stranded wireprocessing [D]. Xi’an: Xi’an University of Architectureand Technology, 2004 (in Chinese).
[17]	Standardization Administration of the People’s Republicof China. Test methods for bare wires—Part 4:Torsion test: GB/T 4909.4—2009 [S]. Beijing: StandardsPress of China, 2009 (in Chinese).
[24]	LEE S K, LEE S B, KIM B M. Process design ofmulti-stage wet wire drawing for improving the drawingspeed for 0.72wt% C steel wire [J]. Journal of MaterialsProcessing Technology, 2010, 210(5): 776-783.
[25]	ZELIN M. Microstructure evolution in pearlitic steelsduring wire drawing [J]. Acta Materialia, 2002, 50(17):4431-4447.
[18]	XU H Y, ZHANG C H. Finite element analysis of rollerbearing based on the plastic material models [J]. Journalof Mechanical Engineering, 2010, 46(11): 29-35 (inChinese).
[19]	WANG X M. Numerical analysis of ANSYS engineeringstructure [M]. Beijing: China CommunicationsPress, 2007 (in Chinese).
[20]	SIMA A P. Influence of stress triaxiality on materialfracture [D]. Shanghai: Shanghai Jiao Tong University,2009 (in Chinese).
[21]	HU S Y. Manual of mechanical failure analysis [M].Chengdu: Sichuan Science and Technology Press, 1989(in Chinese).
[22]	Standardization Administration of the People’s Republicof China. Steel——Determination of microstructure:GB/T 13299—1991 [S]. Beijing: StandardsPress of China, 1991 (in Chinese).
[23]	LUO S M. Study on key techniques of stranded wireprocessing [D]. Xi’an: Xi’an University of Architectureand Technology, 2004 (in Chinese).
[24]	LEE S K, LEE S B, KIM B M. Process design ofmulti-stage wet wire drawing for improving the drawingspeed for 0.72wt% C steel wire [J]. Journal of MaterialsProcessing Technology, 2010, 210(5): 776-783.
[25]	ZELIN M. Microstructure evolution in pearlitic steelsduring wire drawing [J]. Acta Materialia, 2002, 50(17):4431-4447.