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CAPture Fatigue offers distinctive advantages when compared to fatigue analysis solutions from other companies: |
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Flexible Set-up: CAPture Fatigue can be configured either in a stand-alone mode or connected to a PC. In the former case, the hardware module records the information and stores it on an on-board hard drive for subsequent analysis; while in the latter case, the data is downloaded to a PC for further analysis. |
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Completeness: CAPture Fatigue is one of the few fatigue analysis solutions that includes both hardware (acquisition component) and software (analysis component) modules. Most solutions in the market require the user to approach different vendors for the acquisition and analysis components. |
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Configurability: The acquisition component of CAPture Fatigue is highly configurable; with parameters such as Variable Sampling Rate, Strain Gauge properties (gauge resistance, lead resistance ratio, etc.), Offset Nulling, and Shunt Calibration offering various selection options. |
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Value-priced: CAPture Fatigue, like the other CAPture products, offers great value for money, thanks to its industry-standard hardware module, and its Windows-based software module. |
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- Overview
- Specifications - Hardware
- Specifications - Software
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Captronic’s Fatigue and Stress analysis solution, CAPture Fatigue, can be used for the analysis of stress at different points on a structure; and, in turn, for operational-life prediction of the structure. The strain data required for the analysis module is measured through the strain gauges mounted on the structure.
The CAPture Fatigue hardware module offers all of the features needed for simple or advanced strain and bridge-based sensor measurements. The CAPture Fatigue software module allows analysis of the measurements, in a user-friendly Windows based environment.
CAPture Fatigue is one in a suite of CAPture products, from Captronic Systems; the products targeting automated test requirements, and control and acquisition requirements, across a diversity of industries.
CAPture Fatigue can be used to monitor the material lifecycle of any engineered component; from as small as a gear-assembly to as large as a power turbine. |
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| Analog Input Characteristics |
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| Number of channels |
24 |
| Input coupling |
DC |
| Maximum working voltage |
Either input should remain within ±10 V of ground. Both inputs should be within ±10 V of one another. |
| Over voltage protection |
±35 V powered on, ±25 V powered off |
| Transfer Characteristics |
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| Nonlinearity |
Better than 0.02% |
| Gain error |
±.35% of setting, +0.1% of EEPROM value |
| Offset error |
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| Gain>20 |
150 µV maximum |
| Gain<20 |
3 mV maximum |
| Filter Characteristics |
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| Low pass filter type |
4-pole Butterworth (24 dB octave roll off) |
| Low pass filter settings |
10 Hz, 100 Hz, 1 kHz, 10 kHz, or bypass |
| Bandwidth, filter bypassed |
-3 dB at 20 kHz |
| Analog Input Stability |
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| Recommended warm-up time |
15 minutes |
| Gain drift |
±40 ppm/C maximum |
| Offset drift |
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| Gain>20 |
2 µV/°C typical, ±5 µV/ °C maximum |
| Gain<20 |
0 µV/°C typical, ±25µV/°C maximum |
| Bridge Completion |
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| Half bridge |
5 k precision resistor network internal to module |
| Quarter Bridge |
Resistor in accessory terminal block SCXI-1314 |
| Shunt Calibration |
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| Type |
2 independent points |
| Resistor |
In terminal block |
| Switch resistance |
32 |
| Switch off leakage |
<1 nA |
| Switch break-down voltage |
±60 VDC |
| Environment |
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| Operating temperature |
0 to 50 °C |
| Storage temperature |
-20 to 70 °C |
| Relative humidity |
10 to 90% non-condensing |
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| Software Features |
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The data for the analysis is transferred from the hardware used for the measurement of strain data, to the laptop/ PC on which the analysis is done. The CAPture Fatigue software module provides the following features: |
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Rosette Analysis |
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Cycle Counting |
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Life Prediction |
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S-N Curve |
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Rain Flow and Damage Histogram |
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Materials Database and Editor |
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| Functional Capability |
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General Processing. |
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Select model subsets by property ID, material group, or user-defined set. |
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Perform multiple analysis types within the same job. |
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Identify critical areas and hotspots automatically. |
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New, robust, multi-axial assessment technology. |
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Exact cycle values used. |
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Looping on input data. |
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Process interactively. |
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Stress gradient sensitivity taken into account. |
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| Results Output |
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Output results to ASCII, Excel, XML. |
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| Managing Materials |
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Database of commonly used material properties with examples to support all analysis types. |
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Materials database manager – create, edit, or import material data. |
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Tabulate and graphically display material curves. |
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Estimate effects of surface condition on fatigue performance |
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User input correction factor |
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Method applicable to all S-N and E-N calculations. |
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| S-N Analyzer |
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Supports the following S-N formulations. |
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Standard log-log curves. |
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Digitized S-N curves including nested multi-mean or R-ratio curves. |
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Rainflow cycle counting and linear damage summation. |
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Static failure checking and statistics.
Mean stress correction by Goodman, Gerber, or interpolation. |
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Back calculations on scale factor. |
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| E-N Analyzer |
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Local strain approach. |
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Neuber and Hoffmann-Seeger notch corrections. |
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Simple and critical plane methods. |
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Rainflow cycle counting and linear damage summation. |
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Mean stress correction by Morrow, SWT, or interpolation. |
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Static failure checking and statistics. |
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Back calculations on scale factor. |
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Maintains correct cycle sequence for accurate positioning of hysteresis loops. |
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| Spot Weld Analyzer |
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Spot weld fatigue analysis using Rupp/LBF approach. |
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Bar, CWELD, and ACM representations supported. |
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| General Usage |
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Simple, intuitive interface, with drag and drop input for loading inputs. |
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Define the whole process graphically from a single screen. |
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Create and save processes for re-use. |
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| Platform Support |
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Windows 2000, Windows XP, Windows Vista. |
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