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Product Code
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Product Description
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PRS-ROTBTMAC
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Rotary
Bending Fatigue Testing Machine
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ParsRos Rotary Bending Fatigue Testing Machines are suitable to test the fatigue
strength of metals or other materials. These machines test the bending fatigue
limit of metals under the action of symmetrical, repeatedly alternating bending
force.
Accordingly, the
tension-compression fatigue limit and torsion fatigue limit can be determined
by calculation according to experienced formula.
These systems are simple in
structure, easy to operate, stable and reliable.
The machine design aims to implement load from two
points on the rotating sample. The sample functions as a simple rod and the
load is loaded symmetrically at two points. When rotated half a turn, the
stress-es in the clamping jaws are initially reversed by placing the load on
the sample. When the cycle is completed, stresses are generated in the opposite
direction so that a complete bending stress cycle is generated during a full
cycle.
Our Rotary Bending Fatigue Test Machines are used in educational and
research institutes to carry out fatigue tests of materials under bending and
rotation.
ROTATING BENDING FATIGUE TEST
Rotational moving parts and machine parts are subject
to periodic fluctuating loads. Even if the dynamic load is well below the
static load capacity, the cracks can be suddenly spread after reaching a
critical size and the size of the loads causing damage can be less than the
tensile strength and / or yield strength of the material. This load may cause
the component to break after a long time due to material fatigue. The fatigue
strength of the components is determined in fatigue strength tests or endurance
tests. It shows the basic principles of fatigue strength testing and the
creation of the Wöhler diagram (S-N curve). Clean regular and simple operation
means that the experimental sequence can be seen in all details and stages. In
the test, a cantilever mounted and rotating cylindrical sample is subjected to
a single force.
The
load on the sample corresponds to a cantilevered bend-ing beam. The sample is
directly subjected to bending stress and the material is broken after a certain
number of load cycles due to fatigue. In the load application system, the
necessary force is generated by means of a ball screw and a moving support.
The
load amplitude can be adjusted continuously by means of a screw shaft or
precision servo systems. The non-contact encoder records the number of load
cycles and displays them digitally. The impulse for the encoder is provided by
the inductive proximity sensor on the motor coupling. The encoder can also be
used to measure speed.
When
the sample breaks, the stop switch automatically stops the electric motor. A
protective sheath protects against flying parts.
Samples with various fillet radii to illustrate the
effect of the notch and the effect of the surfaces are included in the
TECHNICAL SPECIFICATIONS
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Engine
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Standard 3-phase AC
motor. (6000 rpm high speed motors as option.)
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Ball Bearings
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Bearings designed for high torsion resistance.
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Vertical Weight
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Calibrated loadcell controlled by
stepper motor and screw shafts. (Servo motor and dead weight as option)
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Sample Length
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Customer needs can be determined in line with the
requirements, the minimum length can be changed in kiln applications.
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Sample Gripping system;
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ER25 series Ø 1 - 16 mm ER32 series Ø
1 - 20 mm,
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Oven connection
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Adjustable centering on x / y axes.
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Power
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220 V, 50 Hz. 0.37 kW / For Oven 2 kW
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These systems are simple in structure, easy to operate, stable and
reliable.
Compact table unit with constant bending, adjustable holders for specimens
and the possibility to adjust the cooling temperature to -30 ° C,
Designed for testing at ambient temperature or with a high temperature oven
up to 1000
° C.
