Effect of Pulsed Electric Current Treatment on the Corrosion and Strength of Reinforcing Steel

2012 ◽  
Vol 706-709 ◽  
pp. 937-944 ◽  
Author(s):  
Leopold Kruszka ◽  
Anatoli Babutsky ◽  
Andreas Chrysanthou ◽  
Chu En Tan
Keyword(s):  
Electric Current ◽  
Testing Machine ◽  
Current Treatment ◽  
Static Strength ◽  
Static Tension ◽  
Reinforcing Steel ◽  
Corrosion Tests ◽  
Universal Testing ◽  
Tension Tests ◽  
Pulsed Electric Current

The study was carried out in order to evaluate the effect of the pulsed electric current (PEC) treatment on the corrosion as well as on static strength of Polish reinforcing steel. As-received St3SX was used for investigations. Two kinds of specimens were manufactured by turning from 20 mm diameter re-bars: cylinders of 10 mm diameter and 28 mm length for corrosion tests and standard cylindrical specimens of 6 mm diameter and 30 mm length for static tension tests. Corrosion tests was performed according to the ASTM B117-97 standard. As-received steel tensile specimens and the specimens after PEC treatment were tested using a servo-hydraulic universal testing machine at the strain rate of 10-2 s-1.

scholarly journals PROPERTI MEKANIK TARIK BAJA WIRE O 3.2 MM DAN PC BAR O 7.1 MM SEBAGAI TULANGAN PADA TIANG PANCANG BETON PRATEKAN SPUN PILE

2018 ◽  
Vol 3 (1) ◽  
pp. 67-76
Author(s):  
Candra Irawan ◽  
I Gusti Putu Raka ◽  
Faimun Faimun ◽  
Rudy Djamaluddin ◽  
Priyo Suprobo ◽  
...  
Keyword(s):  
Strain Gauge ◽  
Testing Machine ◽  
Tensile Load ◽  
Ultimate Stress ◽  
Outer Side ◽  
Reinforcing Steel ◽  
Data Logger ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
The Wire

Abstrak Paper ini menyajikan properti mekanik tarik baja tulangan wire berdiameter 3.2 mm dan PC bar berdiameter 7.1 mm yang digunakan sebagai tulangan transversal dan longitudinal untuk tiang pancang beton pratekan spun pile. Pembebanan aksial tarik dilakukan menggunakan mesin Universal Testing Machine (UTM). Regangan tarik yang terjadi pada baja tulangan dibaca oleh sensor strain gauge yang ditempel pada bagian sisi luar baja tulangan. Beban tarik dan regangan baja tulangan direkam menggunakan alat data logger. Hasil pengujian tarik ini berupa kurva hubungan antara tegangan dan regangan. Analisis kurva tersebut menghasilkan modulus elastisitas PC bar adalah 230 GPa dan wire dan 220 GPa. PC bar memiliki tegangan leleh  1404 MPa dan tegangan ultimit  1469 MPa. Regangan saat leleh PC bar  0.007 dan regangan ultimitnya 0.023. Sedangkan wire memiliki tegangan ultimit 712 MPa. Nilai elongasi wire dan PC bar adalah 2.0% dan 8.7%. Kata-kata kunci: properti mekanik tarik, PC bar, wire, spun pile. Abstract This paper presents the tensile mechanical properties of the 3.2 mm in diameter of the wire and 7.1 mm in diameter of PC bars used as transverse and longitudinal reinforcement for prestressed spun piles. The axial tensile loading is carried out on using Universal Testing Machine (UTM) machine. The tensile strain was occurring in the reinforcing steel read by the strain gauge sensor attached to the outer side of the reinforcing steel. The tensile load and reinforcement steel strain are recorded using the data logger. The result of this tensile test is a curve of the stress and strain relationship. The elastic modulus of PC bar and the wire is 229577 MPa and 219774 MPa. The yield and ultimate stress of the PC bar are 1404 MPa and 1469 MPa. The yield and ultimate strain are 0.007 and  0.023, respectively. Wire 3.2 mm has a 712 MPa ultimate stress. The value of wire and PC bar elongation is 2.0% and 8.7%, respectively. Keywords: tensile mechanical property, PC bar, wire, spun pile.

scholarly journals Tailoring Grain Boundary and Resultant Plasticity of Pure Iron by Pulsed-Electric-Current Treatment

2018 ◽  
Vol 50 (2) ◽  
pp. 856-862 ◽  
Author(s):  
C. Yang ◽  
Y. J. Zhao ◽  
Z. Wang ◽  
S. G. Qu ◽  
X. Q. Li ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Electric Current ◽  
Pure Iron ◽  
Current Treatment ◽  
Pulsed Electric Current

Rapid anisotropy recovery in deformed FCC metals by high-density pulsed electric current treatment

Vacuum ◽  
2021 ◽  
pp. 110855
Author(s):  
Shaojie Gu ◽  
Yi Cui ◽  
Sungmin Yoon ◽  
Zizheng Wang ◽  
Yasuhiro Kimura ◽  
...  
Keyword(s):  
Electric Current ◽  
Current Treatment ◽  
High Density ◽  
Fcc Metals ◽  
Pulsed Electric Current

scholarly journals INFLUENCE OF PULSED ELECTRIC CURRENT ON THE WAVES MOTION CHARACTER OF PLASTIC DEFORMATION AT TENSION OF A STEEL PLATE

2019 ◽  
Vol 62 (2) ◽  
pp. 148-153
Author(s):  
A. Yu. Gagarin ◽  
V. D. Sarychev ◽  
S. A. Nevskii ◽  
A. I. Potekaev
Keyword(s):  
Plastic Deformation ◽  
Electric Current ◽  
Structural Changes ◽  
Electric Pulse ◽  
Testing Machine ◽  
Central Area ◽  
Sample Temperature ◽  
Joule Effect ◽  
Pulsed Electric Current ◽  
Deformable System

Infrared thermography and two-exposure speckle interferometry have been used to study the plastic deformation of low-carbon steel under the action of pulsed electric current. It was established that external electric effect leads to an increase in velocity of plastic waves by 65  %. Analysis of the velocity distribution patterns showed that they have the profile of “shock transition”. At the origin, velocity of the material is zero (motionless gripping), and at the right end of the curve material velocity is equal to stretching speed specified by testing machine. The effect of electric current leads to splitting of the displacements velocities, both at moving and stationary ends of the samples. It is assumed that the observed splitting is related to the Stark splitting of energy levels of the deformed system. This splitting leads to a decrease in the potential barrier for the motion of defects in crystal lattice. Thermographic studies have shown presence of a temperature gradient directed from clamps to center of the sample, which does not coincide with pattern of displacement distribution. It was determined that during the primary treatment with high power current pulses in the central area of the sample, sample temperature reaches 351  K, and 330  K in the area adjacent to clamps. Subsequent treatments result in a slight increase in temperature. This behavior of temperature can be explained by the fact that heat does not dissipate at a repetition rate of 10  Hz. On an average, sample temperature increases by 30  K. Theoretical calculation has shown that the Joule effect leads to an increase in temperature of the sample by 21  K per pulse, which is practically in agreement with experimental results. Estimates of thermal energy and energy of elastic deformation have shown that the fastest channel for converting the energy of electric pulse is structural changes in deformable system, which lead to the observed decrease in deforming force.

scholarly journals Effect of pulsed electric current treatment on corrosion of structural metals

2009 ◽  
Vol 41 (4) ◽  
pp. 387-391 ◽  
Author(s):  
A. I. Babutskii ◽  
A. Chrysanthou ◽  
J. Ioannou
Keyword(s):  
Electric Current ◽  
Current Treatment ◽  
Pulsed Electric Current ◽  
Structural Metals

Crush Response of Polyurethane Foam-Filled Aluminium Tube Subjected to Axial Loading

2014 ◽  
Vol 875-877 ◽  
pp. 534-541 ◽  
Author(s):  
Chawalit Thinvongpituk ◽  
Nirut Onsalung
Keyword(s):  
Energy Absorption ◽  
Polyurethane Foam ◽  
Testing Machine ◽  
Axial Loading ◽  
Asymmetric Mode ◽  
Pu Foam ◽  
Universal Testing ◽  
Collapse Mode ◽  
Empty Tube ◽  
Foam Filled

In this paper, the experimental investigation of polyurethane (PU) foam-filled into circular aluminum tubes subjected to axial crushing was presented. The purpose of this study is to improve the energy absorption of aluminium tube under axial quasi-static load. The aluminium tube was made from the AA6063-T5 aluminium alloy tubes. Each tube was filled with polyurethane foam. The density of foam was varied from 100, 150 and 200 kg/mP3P including with empty tube. The range of diameter/thickness (D/t) ratio of tube was varied from 15-55. The specimen were tested by quasi-static axial load with crush speed of 50 mm/min using the 2,000 kN universal testing machine. The load-displacement curves while testing were recorded for calculation. The mode of collapse of each specimen was analyzed concerning on foam density and the influence of D/t ratio. The results revealed that the tube with foam-filled provided significantly increment of the energy absorption than that of the empty tube. While the density of foam and D/t ratios increase, the tendency of collapse mode is transformed from asymmetric mode to concertina mode.

scholarly journals Mechanical Properties of the Composite Material consisting of β-TCP and Alginate-Di-Aldehyde-Gelatin Hydrogel and Its Degradation Behavior

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1303
Author(s):  
Michael Seidenstuecker ◽  
Thomas Schmeichel ◽  
Lucas Ritschl ◽  
Johannes Vinke ◽  
Pia Schilling ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Protein Concentration ◽  
Failure Load ◽  
Testing Machine ◽  
Experimental Period ◽  
Flow Chamber ◽  
Degradation Behavior ◽  
Gelatin Hydrogel ◽  
Universal Testing

This work aimed to determine the influence of two hydrogels (alginate, alginate-di-aldehyde (ADA)/gelatin) on the mechanical strength of microporous ceramics, which have been loaded with these hydrogels. For this purpose, the compressive strength was determined using a Zwick Z005 universal testing machine. In addition, the degradation behavior according to ISO EN 10993-14 in TRIS buffer pH 5.0 and pH 7.4 over 60 days was determined, and its effects on the compressive strength were investigated. The loading was carried out by means of a flow-chamber. The weight of the samples (manufacturer: Robert Mathys Foundation (RMS) and Curasan) in TRIS solutions pH 5 and pH 7 increased within 4 h (mean 48 ± 32 mg) and then remained constant over the experimental period of 60 days. The determination surface roughness showed a decrease in the value for the ceramics incubated in TRIS compared to the untreated ceramics. In addition, an increase in protein concentration in solution was determined for ADA gelatin-loaded ceramics. The macroporous Curasan ceramic exhibited a maximum failure load of 29 ± 9.0 N, whereas the value for the microporous RMS ceramic was 931 ± 223 N. Filling the RMS ceramic with ADA gelatin increased the maximum failure load to 1114 ± 300 N. The Curasan ceramics were too fragile for loading. The maximum failure load decreased for the RMS ceramics to 686.55 ± 170 N by incubation in TRIS pH 7.4 and 651 ± 287 N at pH 5.0.

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