Hydraulic universal testing machine for weldable reinforcing
steel-Bar, coil and decoiled tensile bend test
Working principle:
The main machine employs a six-column frame structure with four
columns and two lead screws. The upper crossbeam and lower
crossbeam form the stretching space, while the lower crossbeam and
worktable constitute the compression space. Composed of an
electrical controller, servo valve, load sensor, displacement
sensor, extensometer, and computer, it forms a closed-loop servo
control system. This system can automatically and precisely control
the testing process and automatically measure test parameters such
as test force, displacement, and deformation.
Application:
(1) Application in Tensile Tests
Test Device and Fixture Configuration
Special wedge-shaped fixtures are used to fix both ends of the
ribbed steel bar specimen, ensuring that the clamping surface is
perpendicular to the specimen's axis to avoid eccentric loading
that may affect test accuracy. The upper and lower crossbeams form
a tensile space, and axial tensile force is applied through the
hydraulic system.
Control Mode and Parameter Setting
A composite control mode of force control - displacement control is
typically adopted: in the initial stage, force is applied at a
constant rate (e.g., 10 kN/min), and when approaching the yield
point, it switches to displacement control (0.05 - 2 mm/min) to
accurately capture the yield strength.
Data Collection and Analysis
The load sensor monitors the tensile force variation in real time,
the extensometer records the deformation within the gauge length,
and the computer automatically plots the "force - displacement"
curve, calculating parameters such as specified non-proportional
elongation strength (ReL, ReH), tensile strength (Rm), and
percentage elongation after fracture (A).
(2) Implementation of Bending Tests
Bending Device and Method
Replace the bending indenter and supports, adjust the support
spacing according to the diameter of the ribbed steel bar
(typically 3 times the diameter), adopt a 180° cold bending method,
and slowly press the indenter down until the specimen is bent to
the specified angle, then observe whether cracks appear on the
surface.
Verification of Standard Compliance
In accordance with GB/T 1499.2 - 2018 Steel for the Reinforcement
of Concrete - Part 2: Hot - Rolled Ribbed Steel Bars, the surface
of the specimen after the bending test shall not have visible
cracks to verify that its technological properties meet the
requirements of construction steel.
| Characteristic tensile properties |
| Yield strength,R.
MPa | Tensile/yield strength ratio,R/R | Total elongation at maximum force,Age
% |
| B500A | 500 | 1.05 | 2.5 |
| B500B | 500 | 1.08 | 5.0 |
| B500C | 500 | ≥1.15,<1.35 | 7.5 |
Rm/R.characteristic is 1.02 for sizes below 8mm.
A:characteristic is 1.0%for sizes below 8mm.
Values of R.specified are characteristic withp=0.95.
Values of R/R,and Ag specified are characteristic with p=0.90.
Calculate the values of Rmand R.using the nominal cross sectional
area. |
| The absolute maximum permissible value of yield strength is 650
MPa. |
For yield strength(Re),the upper yield strength(ReH)shall
apply.Determine the yield strength(Re)from
the 0.2%proof strength(Rpo.2)if a yield phenomenon is not present. |
Standards:
ISO 6892, ISO 6934, BS4449, ASTM C39,ISO75001, ASTM A370, ASTM E4,
ASTM E8 and BSEN standards.
Main technical parameters:
| Model | WAW-1000G |
| Structure | 4 columns and 2 screws |
Control way | loading process manual control,computer automatic data dealing |
| Max.load (kN) | 1000kN |
| Load accuracy | ≤±0.5% |
| Load range | 2%-100%FS |
| Isokinetic stress control range | 2-60 (N/mm2•S-1) |
| Stress rate error | ≤±0.5% |
| Load resolution | 1/600000 |
| Deformation Measurement Range | 2%～100%FS |
| Deformation accuracy | ≤±0.5% |
| Displacement resolution (mm) | 0.01 |
| Displacement error | ≤±0.5% |
| Max.piston stroke(mm) | 250 |
| Max piston moving speed | 0.5-100 mm/min Manual adjustment |
| Crosshead lifting speed | 300mm/min |
| Max. tension test space | 700mm (can customize) |
| Max.Compression Test Space | 600mm (can customize) |
| Clamping method | Hydraulic clamp |
| Round specimen clamping range (mm) | φ13-φ60 mm(13-26,26-40,40-60) |
| Flat specimen clamping range (mm) | 0-15,15-30 mm |
| Flat specimen clamping width(mm) | 80 |
| Compression plate size (mm) | 200*200 |
| Bending roller distance(mm) | 450 |
| Width of bending rollers (mm) | 120 |
| Power supply | 3-phase,AC380V, 50Hz(can be customized) |
| Weight and size | 3200KG,1060mm*850*2370mm |
Packing and Shipping:
Frequently Asked Questions:
Q1. Are your company a trading one or a factory?
A: Factory + trade (ntegration), 18 years focusing on test
instnments feld, 14 years export experl ence.
Q2. How to choose the most suitable products?
A: Our professional leam will give you the best suggestion as long
as you tell us what kind of test you need to do and the required
specification
Q3.what's the dellvery term?
A: At most of time, we have stock in the factory. If there is no
stock, normaly, the delivery time is 15-20 working days after
deposit receipt
If you are in urgent need, we can consider making special
arrangement for you.
Q4.Do you accept customization service?
A: Yes, of course, we can not only offer standard machines, but
also customized machines according to your request.
Don't hesitate to tell us your requirement we will try our best to
meet your needs.
Q5. Can we visit your factory betore order?
A: Yes, we warmly welcome and sincerely invite you or your team to
vist our factory, we will help to arrange hotel and pick up you
from airpor.
Q6. How about your warranty?
A: Generaly, our waranty is one year witrin the warranty period. we
can offer technlque support and part parts change. Necessarily, our
engineers may go to your place for better service.
Q7. How about the packing for machine, Is it safely protected
during transportation?
A: Our machine is packed by standard export wooden box, it won't be
damaged. We've delivered many testing machines abroad by sea or by
ar without damage.
