SKU: AG-031


1  AG-031. Unit:

Bench-top unit for fatigue strength testing.

Anodized aluminium structure and panels in painted steel (epoxy paint).

Diagram in the panel with similar distribution to the elements in the real unit.

Electrical motor of  0.37 kW, maximum speed: 1500 rpm.

Motor speed control by a frequency regulator, controlled by the control software (from the computer (PC)).

Metallic protective covers, one for the motor axis zone, and other for the test specimen zone, with safety protection system to avoid accidents.

Safety switch that stops the motor when the metallic protection is removed.

Test specimens (test bars):

2 Stainless steel AISI 304L cylindrical test specimens.

6 Stainless steel AISI 304L cylindrical test specimens, with different notches.

2 Carbon steel F-1 cylindrical test specimens.

6 Carbon steel F-1 cylindrical test specimens, with different notches.

2 Steel F-212 cylindrical test specimens.

6 Steel F-212 cylindrical test specimens, with different notches.

Loading device with load cell. Adjustment using threaded spindle with hand wheel. Force sensor, range: 0-30 kg.

Automatic shut down on specimen fracture controlled from the control software (from the computer (PC)).

Speed sensor and cycle counter. Range: from 0 to 5000 rpm.

Speed and force measurement.

2  AG-031_CIB.Control Interface Box:

Control interface box with process diagram in the front panel and with the same distribution that the different elements located in the unit, for an easy understanding by the student.

All sensors, with their respective signals, are properly manipulated from -10V. to +10V computer output.

Sensors connectors in the interface have different pines numbers (from 2 to 16), to avoid connection errors.

Single cable between the control interface box and computer.

The unit control elements are permanently computer controlled, without necessity of changes or connections during the whole process test procedure.

Simultaneously visualization in the computer of all parameters involved in the process.

Calibration of all sensors involved in the process.

Real time curves representation about system responses.

Storage of all the process data and results in a file.

Graphic representation, in real time, of all the process/system responses.

All the actuators values can be changed at any time from the keyboard allowing the analysis about curves and responses of the whole process.

All the actuators and sensors values and their responses are placed in only one computer screen.

Shield and filtered signals to avoid external interferences.

Real time computer control with flexibility of modifications from the computer keyboard of the parameters, at any moment during the process.

Real time computer control for pumps, compressors, resistances, control valves, etc.

Open control allowing modifications, at any time and in a real time, of parameters involved in the process simultaneously.

Three safety levels, one mechanical in the unit, other electronic in control interface and the third one in the control software.

3  AG-031_DAB. Data Acquisition Board:

PCI Data acquisition board (National Instruments) to be placed in a computer slot.

Bus PCI.

Analog input:

Number of channels= 16 single-ended or 8 differential.

Resolution=16 bits, 1 in 65536.

Sampling rate up to: 250 KS/s (Kilo samples per second).

Input range (V)= ±10V.

Data transfers=DMA, interrupts, programmed I/0.

Number of DMA channels=6.

Analog output:

Number of channels=2.

Resolution=16 bits, 1 in 65536.

Maximum output rate up to: 833 KS/s.

Output range(V)= ±10V.

Data transfers=DMA, interrupts, programmed I/0.

Digital Input/Output:

Number of channels=24 inputs/outputs.

D0 or DI Sample Clock frequency: 0 to 1 MHz.

Timing: Counter/timers=2.

Resolution: Counter/timers: 32 bits.

4  AG-031_CCSOF.Computer Control+Data Acquisition+Data Management Software:

Compatible with actual Windows operating systems.

Graphic and intuitive simulation of the process in screen.

Compatible with the industry standards.

Registration and visualization of all process variables in an automatic and simultaneously way.

Flexible,  open  and  multicontrol  software,  developed  with  actual  windows  graphic  systems,  acting simultaneously on all process parameters.

Management, processing, comparison and storage of data.

Sampling velocity up to 250,000 data per second guaranteed.

Calibration system for the sensors involved in the process.

It allows the registration of the alarms state and the graphic representation in real time.

Comparative analysis of the obtained data, after the process and modification of the conditions during the process.

Open software, allowing to the teacher to modify texts, instructions.

Teacher’s and student’s passwords to facilitate the teacher’s control on the student, and allowing the access at different work levels.

This unit allows that the 30 students of the classroom can visualize simultaneously all results and manipulation of the unit, during the process, by using a projector.

5  Cables and Accessories, for normal operation.

6  Manuals:

This unit is supplied with 8 manuals: Required Services, Assembly and Installation, Interface and Control Software, Starting-up, Safety, Maintenance, Calibration & Practices Manuals. 


1.-   Determination of the basic principles of fatigue strength testing.

2.-   Influence of the type of material on fatigue strength.

3.-   Determination of the influence of notching and surface finish on fatigue strength.

4.-   Influence of different curvature radio and surface finish on fatigue strength.

5.-   Influence of the section on fatigue strength.

6.-   Fatigue strength of specimens (bars) subject to cyclic bending load.

7.-   Preparation of a stress-number (S-N) diagram.

8.-   Obtaining of S-N curves.

Other possible practices:

9.-   Sensors calibration.



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