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Resonant testing machine as table model for dynamic bending load applications testing frequencies 40 300 Hz
CRACKTRONIC
RUMUL RUSSENBERGER PRFMASCHINEN AG
General
Mainly two observations in dynamic material testing were thereasons to develop the CRACKTRONIC
A high number of tests are done with low loads For bending load tests instead of axial loading
(tension/compression) such a small and low cost machine is favorable.
In addition a lot of tests are to be done on small specimens.Evaluations of fatigue crack growth rates are comfortablydone with our crack length measuring system FRACTOMATand our SOFTWARE.
Functional description
The kinematic conditions allow a purebending between the gripping heads.An electromagnetic driven resonator,built as a rotary oscillator, creates anappropriate bending moment. Indepen-dent to the dynamic drive a static moment is possible to be applied to the specimen via a torsion rod.
Dynamometer Torsion rod
Specimen Armature of the exciting magnet
CRACKTRONIC
Main applications
Fatigue tests / S/N-diagrams Fatigue crack growth /
da/dN-curves Precracking of fracture mechanic
specimens also in hot cells manufacturing quality control in
connection with special custom-tailored devices
CRACKTRONICMachine design
The CRACKTRONIC is used for many different testing appli-cations where an easy and fast change of mounted grippingheads is essential.
Due to a conceptual separation of the testing machine into abasicmodule with all drives and easily mountable grippingheads for the specimens a change of the gripping head canbe done within a few minutes. Each gripping head contains acomplete fixation with an adequate sensor and measuringpreamplifier.
Essential features of the mechanical conceptions are besidethe modular design the adjustable magnet which gives muchmore flexibility for testing soft specimens and to realize cus-tom-tailored solutions at cost-saving conditions (for compo-nents, hot cell, corrosion, etc.).
The CRACKTRONIC is equipped with the control unitCREDO and a PC workstation to operate the easy to useRUMUL software.
Control conception
The RUMUL control unit CREDO is designed as a compact adaptive testingsystem. The twin computer conceptallows a consequent separation in func-tions. The operating system runs underWINDOWS. All measuring data are processed on-line by the main controlprogram in the process computer.
Examples of specimens Gripping head for customer designedspecimen
Gripping head for sheet metal tests
Gripping head for hot cell
CRACKTRONIC
SOFTWARE-PROGRAMS
Fatigue tests
Due to the low power consumption (approx. 5 W) and the high testing frequencies theCRACKTRONIC is well suited for fatigue tests.In connection with the RUMUL SOFTWARE different evaluation methods are available;
arc sin p Transformation Weibull procedure Perlschnur (regression) stair case method
There are integrated diagram-functions as wellas ASCII-files for customer made evaluationsoftware available.
Arc sin p Transformation
History-record frequency drop
Frequency drop / load adjustment
Precracking
If fracture mechanics specimens need a fatigue crack (precrack), theCRACKTRONIC is the best solution for precracking of small specimens.
The RUMUL SOFTWARE supports theprecracking procedure efficient and reliable.
The SOFTWARE takes care to reach the final cracklength in several loadsteps to make sure that the procedure is in accordance with standards.
CRACKTRONICSOFTWARE-PROGRAMS
Fatigue crack growth
The CRACKTRONIC, appointed as a cyclic load system forbending specimens, combined with KRAK GAGES and thecrack measuring system FRACTOMAT are an ideal configura-tion for receiving da/dN data. The machine is able to be con-trolled manually via the cracklength indicated on theFRACTOMAT. In connection with a PC and the RUMULSOFTWARE an automated testing procedure (i.e. Threshold)is on disposal. The operator is free to change test modes atany time in order to receive new stress intensity values. Thecurrent da/dN curve is on display during the test.
da/dN diagram
Examples for KRAK GAGES
FRACTOMAT
Applied KRAK GAGE
CRACKTRONIC
Bending testsmounted gripping head for specimensup to 10x10 mm
160 Nm mounted gripping head forspecimens up to 12x24 mm
Bending testson metal sheet
Torsion testsmounted gripping head for torsiontests
Tension/compression testsmounted gripping head for specimens CT 14
CRACKTRONICMini-Charpy specimens
adapter pieces for mini specimens 3x4x27 mm or customized shapes
max. bending moment: 160 Nmmax. dyn. bending moment: 160 Nmmax. stat. bending moment: 100 Nmmax. tension load (with tension/compression module): 8 kN
max. testing frequencies (depending on the mounted head): up to 250 Hz, in stepsmax. oscillating angle (depending on the mounted head): 3, adjustablemax. specimen dimensions for bending: 24x12x120 mm
Dimensions: BxHxT machine: 50x20x32 cm control panel: 50x32x37 cm
Weights: machine: 50 kg control panel: 30 kg
Power supply: 230 V / 6 A
Options: gripping heads for bending up to 160 Nm device for torsion tests on round specimens
(clamping 14 mm / 24 mm) or square shapes gripping head for tension/compression up to 8 kN machine controlled by the oscillation angle (analogous to stroke
control mode in tension/compression tests)
Technical specifications
Gewerbestrasse 10/RundbuckCH-8212 Neuhausen am RheinfallSwitzerlandTelephone ++41 52 672 43 22Telefax ++41 52 672 44 48e-mail [email protected] www.rumul.ch
Other well proven RUMUL products
Resonant Testing MachineTESTRONIC50/100/150/250 kN
Resonant Testing MachineMIKROTRON5/20 kN
Resonant System SWINGERefficient equipment foralternating bending load
Crack Length Measuring SystemFRACTOMAT for measuring cracksin fracture mechanics
RUMUL
RUSSENBERGER PRFMASCHINEN AG
MIKROTRON
Resonant Pulsator MIKROTRONfor loads up to 20 kNdynamic stroke up to 4 mmand operating frequencies up to 250 Hz
MIKROTRON resonant testing machine
RUSSENBERGER PRFMASCHINEN AG | Gewerbestrasse 10 | www.rumul.ch | [email protected] 8212 Neuhausen am Rheinfall | Tel +41 52 672 43 22 | Fax +41 52 672 44 48
General
The MIKROTRON testing machine com-
bines a simple and well thought-out
design with a modern and user-friendly
control system. Many decades of
experiences in the design and manufac-
turing of resonant systems and also the
knowledge of the requirements of our
customers allow to achieve a high level
of reliability in a wide field of applicati-
ons. Due to the unique resonant system,
the pulsator is able to work in an opera-
ting frequency range between 50 and
250 Hz in consuming a significant low
power of less than 0,5 kW. The
MIKROTRON is well established in R&D,
quality control and other testing fields.
Characteristical features of all the reso-
nant type testing systems are:
High reliability
No maintenance for valves, pumps or
cooling
Easy operation
Fast testing procedures due to high
operating frequencies
Low energy consumption
Software with many practical and
user-friendly functions
Control concept
The well established dual computer
approach ensures a clear and easy to
understand Windows-based user envi-
ronment, while the embedded device is
running a powerful and robust Linux ope-
rating system to control all machine tasks
in parallel.
Latest technologies like digital signal
processing, FPGA integration (Field Pro-
grammable Gate Array) etc. have been
used to achieve a most reliable control
system with best long-term stability. The
new and comprehensive self-diagnostic
function informs the operator about
unusual events or inappropriate mani-
pulations and therefore helps to avoid
damages.
If necessary the user can individually
adjust all control parameters. This is
especially useful with complicated or
difficult measurement setups.
The RUMUL application programs run-
ning on the Windows computer use a RS
232 or an Ethernet (TCP / IP) link to com-
municate with the machine. Networking
features like remote access, remote
maintenance etc. are prepared.
MIKROTRON
Legend
1 Magnet for dynamic drive
2 Cross head
3 Oscillating springs
4 Oscillating mass
5 Columns
6 Specimen / component
7 Load cell
8 T-slotted table as counter mass
9 Gear drive for static load
10 Ball screw spindle
Function
The diagram shows the drive for the sta-
tic load in the lower machine frame and
the dynamic drive (magnet) in the upper
part of the machine. The effective load on
the test piece is generated by the two
drive systems, controlled and adjusted
independently. The unique design of the
MIKROTRON resonant system results in
an outstanding large oscillating stroke of
+/- 2 mm and still a light machine which
does not require special foundations.
Frequency response
The diagram shows the frequency beha-
viour of the MIKROTRON, 20 kN version,
depending on the stiffness of the speci-
men. In order to vary the frequency within
the drawn range, the oscillating mass (4)
needs to be changed.
MIKROTRON