FLcgs Software
FractureLab & Advanced Fracture Mechanics Associates have teamed up to develop a fatigue and fatigue crack growth customizable software.
Identifying the Demand
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VHCF crack growth testing up to 750 Hz
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Test customization
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Prompt, regular customer support
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Multiple, unattended test segment capability
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Automated crack segment marking-heat tint/stress ratio that is material and geometry dependent.
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Stop criterion as a percentage change over initial PD / compliance.
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Flexible postprocessor that accepts current and legacy controller input.
Delivering the Solution
Next generation mechanical test controller built from the ground up:
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ADwin Gold, -X support (USB and Ethernet)
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Servo-hydraulic and piezo actuator compatibility
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Static, cyclic / dwell fatigue / fatigue crack growth
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User defined wave forms
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Queuing system for multiple test segments
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Crack length measurement input options (compliance, BFSG, DCPD, hyper-DCPD)
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Plastic zone based alternate K gradient to mitigate remote closure
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3-wire active and reference PD solutions
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Pre-verification of load and K prior to control switch
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Autonomous (device based) test capability; can disconnect computer
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Program/computer crash recovery to continue test or retrieve data
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Automated test segment marking
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Regular real-time log file updates
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Multiple output formats (.xml for postprocessor, .csv / .log for user analysis)
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Fatigue crack growth data ASTM E647 compatible postprocessor software:
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Multiple input options (FLcgs log file / .csv, .xml, and legacy .in3 / .in4)
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Input data point selection / omission options prior to analysis
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Optional back face correction for surface flaw specimens
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Visual correction (constant and linear)
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Opening Load, 2/pi, ACR, conventional
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Stress ratio normalized K for master curve
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Full menu of da/dN analysis options (secant, modified secant, 7 point polynomial, modified 7 point combo)
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Threshold Paris Law fit
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Exportable output plots with pan / scale / zoom flexibility
Latest Releases
CONTROLLER
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v.20250912: Static log / output file writer
- GUI: added Bnet to SEN specimen calculations
- GUI: changed log writer to create xml output and proper _segdata file for tensile tests
- GUI: added safety to K convergence check to prevent division by zero
- GUI: set up proper specimen selection menu for testing static specimens (CT, SEN-B, or smooth LCF)
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v.20250811: Metric analysis fixes
- GUI: plot units are meters or MPa sqrt(m); dashboard and controller units are generally mm
- GUI: fixed dashboard and plot labeling to use m instead of mm
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v.20250807: Metric units, eff. B, W correction
- GUI: Added metric unit capability to GUI for crack length and K calculations
- GUI: corrected "effective' B, W calculations based on inner R / outer R values
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​POSTPROCESSOR
v.20250912: ASTM E399 calculator
- Added ASTM E3076 curve fitting routine (universal X-Y slope calculation)
- Added ASTM E399 K1C calculator for C(T) and SEN(B) specimen types
- K1C calculator allows for XML input along with standard 2-column and FLCGS style .csv input.
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v.20250811: Metric analysis fixes
- all units are meters or MPa sqrt(m)
- visual correction input uses METERS (for now)
- corrected .inX converter to send meter unit dimensions
- corrected unit_mult values in populateGUI
- added metric unit labeling for SF specimen
- corrected XML dictionary dimension values to mm; only CC variables are in meters.
- improved labeling of units on plots
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v.20250807: Postprocessor metric units
- introduced metric unit capability
- fixed log / csv import function to properly update crack length and K calculation options​
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