scholarly journals Analysis of the Bauschinger Effect in Cold Drawn Pearlitic Steels

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 114
Author(s):  
Jesús Toribio ◽  
Viktor Kharin ◽  
Francisco-Javier Ayaso ◽  
Miguel Lorenzo ◽  
Beatriz González ◽  
...  
Keyword(s):  
Mechanical Behaviour ◽  
Bauschinger Effect ◽  
High Strength ◽  
Pearlitic Steel ◽  
Internal Stresses ◽  
Compression Load ◽  
Prestressing Steel ◽  
Hardening Rule ◽  
Steel Wires ◽  
Cyclic Tension

Prestressing steel wires usually undergo cyclic loading in service. Therefore, it is of interest to analyse certain features of their mechanical behaviour under this type of loading, such as the Bauschinger effect (BE) or the hardening rule, that fit the real mechanical behaviour appropriately. In this study, different samples of high strength pearlitic steel wires were subjected to cyclic tension-compression load exceeding the material yield strength, thus generating plastic strains. From the experimental results, various parameters were obtained revealing that analysed steels exhibited the so-called Masing type BE. In addition, the variation of the BE characteristics (of the effective and internal stresses) with the applied plastic pre-strain indicated that the studied materials followed a mixed strain hardening rule with the domination of the kinematic component.

Theoretical study of the prestressing strand's stress by computer modeling methods

2020 ◽  
Vol 76 (11) ◽  
pp. 1139-1148
Author(s):  
A. G. Korchunov ◽  
E. M. Medvedeva ◽  
E. M. Golubchik
Keyword(s):  
Residual Stresses ◽  
High Strength ◽  
Pearlitic Steel ◽  
Internal Stresses ◽  
Steel Microstructure ◽  
Compressive Stresses ◽  
Wide Range ◽  
Prestressing Strands ◽  
Increasing Temperature ◽  
Wire Strand

The modern construction industry widely uses reinforced concrete structures, where high-strength prestressing strands are used. Key parameters determining strength and relaxation resistance are a steel microstructure and internal stresses. The aim of the work was a computer research of a stage-by-stage formation of internal stresses during production of prestressing strands of structure 1х7(1+6), 12.5 mm diameter, 1770 MPa strength grade, made of pearlitic steel, as well as study of various modes of mechanical and thermal treatment (MTT) influence on their distribution. To study the effect of every strand manufacturing operation on internal stresses of its wires, the authors developed three models: stranding and reducing a 7-wire strand; straightening of a laid strand, stranding and MTT of a 7-wire strand. It was shown that absolute values of residual stresses and their distribution in a wire used for strands of a specified structure significantly influence performance properties of strands. The use of MTT makes it possible to control in a wide range a redistribution of residual stresses in steel resulting from drawing and strand laying processes. It was established that during drawing of up to 80% degree, compressive stresses of 1100-1200 MPa degree are generated in the central layers of wire. The residual stresses on the wire surface accounted for 450-500 MPa and were tension in nature. The tension within a range of 70 kN to 82 kN combined with a temperature range of 360-380°С contributes to a two-fold decrease in residual stresses both in the central and surface layers of wire. When increasing temperature up to 400°С and maintaining the tension, it is possible to achieve maximum balance of residual stresses. Stranding stresses, whose high values entail failure of lay length and geometry of the studied strand may be fully eliminated only at tension of 82 kN and temperature of 400°С. Otherwise, stranding stresses result in opening of strands.

scholarly journals Fatigue cracking in high-strength cold-drawn pearlitic steel wires for anchorage in rocks

2016 ◽  
Vol 2 ◽  
pp. 2330-2337
Author(s):  
Jesús Toribio ◽  
Beatriz González ◽  
Juan-Carlos Matos
Keyword(s):  
Fatigue Cracking ◽  
High Strength ◽  
Pearlitic Steel ◽  
Steel Wires

Multi-Scale Approach to the Fatigue Crack Propagation in High-Strength Pearlitic Steel Wires

2008 ◽  
Vol 5 (6) ◽  
pp. 101564 ◽  
Author(s):  
J. Toribio ◽  
B. González ◽  
J. C. Matos ◽  
F. J. Ayaso ◽  
Richard Neu ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
High Strength ◽  
Pearlitic Steel ◽  
Multi Scale ◽  
Steel Wires

Corrosion-Fatigue of High Strength Steel Bars: Evolution of Crack Aspect Ratio

2011 ◽  
Vol 488-489 ◽  
pp. 1-4
Author(s):  
Jesús Toribio ◽  
Juan Carlos Matos ◽  
Beatriz González ◽  
J. Escuadra
Keyword(s):  
Aspect Ratio ◽  
Corrosion Fatigue ◽  
Crack Front ◽  
Crack Depth ◽  
High Strength ◽  
Initial Crack ◽  
Crack Advance ◽  
Prestressing Steel ◽  
Steel Wires ◽  
Steel Bars

Abstract. This paper shows the evolution of the surface crack front in prestressing steel wires subjected to fatigue in air and to corrosion-fatigue in Ca(OH)2+NaCl. To this end, a numerical modelling was made on the basis of a discretization of the crack front (characterized with elliptical shape), considering that the crack advance at each point is perpendicular to such a front according to a Paris-Erdogan law, and using a three-parameter stress intensity factor (SIF). Each analyzed case (a particular initial crack geometry) was characterized by the evolution of the semielliptical crack aspect ratio (relation between the semiaxes of the ellipse) with the relative crack depth and by the variation of the maximum dimensionless SIF at the crack front

scholarly journals Fracture behaviour of high-strength cold-drawn pearlitic steel wires: The role of non-metallic inclusions

2021 ◽  
Vol 33 ◽  
pp. 1203-1208
Author(s):  
Jesús Toribio ◽  
Francisco-Javier Ayaso ◽  
Beatriz González ◽  
Rocío Rodríguez
Keyword(s):  
Fracture Behaviour ◽  
High Strength ◽  
Pearlitic Steel ◽  
Steel Wires ◽  
Metallic Inclusions

scholarly journals Size Effects of High Strength Steel Wires

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 240 ◽  
Author(s):  
Kanji Ono
Keyword(s):  
Size Effects ◽  
High Strength ◽  
Pearlitic Steel ◽  
Coefficient Of Determination ◽  
Suspension Bridges ◽  
Long Span ◽  
Steel Wires ◽  
Existing Data ◽  
Design Construction ◽  
Theoretical Developments

This study examines the effects of size on the strength of materials, especially on high strength pearlitic steel wires. These wires play a central role in many long span suspension bridges and their design, construction, and maintenance are important for global public safety. In particular, two relationships have been considered to represent strength variation with respect to length parameters: (i) the strength versus inverse square-root and (ii) inverse length equations. In this study, existing data for the strength of high strength pearlitic steel wires is evaluated for the coefficient of determination (R2 values). It is concluded that the data fits into two equations equally well. Thus, the choice between two groups of theories that predict respective relationships must rely on the merit of theoretical developments and assumptions made.

Bauschinger Effect Exhibited in Advanced High Strength Steel Sheets under Cyclic Tension and Compression Tests

2014 ◽  
Vol 626 ◽  
pp. 561-565
Author(s):  
Heng Kuang Tsai ◽  
Fuh Kuo Chen ◽  
Shi Wei Wang
Keyword(s):  
Finite Element ◽  
High Strength Steel ◽  
Bauschinger Effect ◽  
High Strength ◽  
Compression Tests ◽  
Advanced High Strength Steel ◽  
Steel Sheets ◽  
Cyclic Tension ◽  
Experimental Apparatus ◽  
Tension And Compression

The Bauschinger effect exhibited in the advanced high strength steel sheets was examined by conducting cyclic tension-compression tests. The experimental device for performing the cyclic tension and compression tests with a single sheet specimen was developed in the present study. The experimental apparatus consists of a novel constraint jig that could prevent the sheet specimen from buckling during the compression test. The efficiency of the developed clamping device was validated by both the finite element analysis and the cyclic tension and compression tests conducted in the present study. The test results reveal that the advanced high strength steel exhibits significant Bauschinger effect. It is also confirmed that the finite element prediction of springback present in the stamping of advanced high strength steel sheets is more consistent with the experimental results if the Bauschinger effect is considered.

Manufacturing of High-Strength and High-Ductility Pearlitic Steel Wires Using Noncircular Drawing Sequence

2014 ◽  
Vol 38 (7) ◽  
pp. 743-749
Author(s):  
Hyun Moo Baek ◽  
Sun Kwang Hwang ◽  
Ho Seon Joo ◽  
Yong-Taek Im ◽  
Il-Heon Son ◽  
...  
Keyword(s):  
High Strength ◽  
Pearlitic Steel ◽  
High Ductility ◽  
Steel Wires
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