Thermo-mechanical fatigue (TMF) testing is a complex and demanding strain controlled testing under programmable
temperature variations. Instron offers a comprehensive solution for such testing that requires simulating of synchronised
heating and cooling of specimens combined with mechanical loading with real time thermal strain compensation.
TMF test systems are useful to test the operational efficiency and reliability of turbine components and structures when
subjected to simultaneous changes in temperatures and load under laboratory controlled environment. Our state of the
art digital servo used with TMF test system envisages independent induction heating and cooling through compressed
air and also allows multi zone temperature tracking1. MTL32 proprietary algorithms used with our controllers permit
precision heating rates up to 20 °C/s and cooling up to 10 °C/s.
Features
Fully integrated standalone systems rated from100 kN
Digital servo-controlled induction heating2 and pneumatic air cooling
Features
Fully integrated standalone systems rated from100 kN
Digital servo-controlled induction heating2 and pneumatic air cooling
Self-aligning, self-locking, zero backlash water cooled hydraulic grips to test threaded and tubular samples
Thermocouple based/non-contact type temperature measurements available
Encoder based displacement measurements with 0.1 µm resolution
1µm resolution extensometer rated for 1200 °C operations
Real time thermal strain compensation3
Digital servo controller for synchronous control and data acquisition
In compliance with ASTM E2368 and ASTM E606
User friendly application software
In phase and out of phase waveform generation
Graphical representation of graphs and results
Auto data acquisition settings depending on test frequency to ensure sufficient data points to calculate various parameters
Option to save test profiles
Auto stroke and strain limit settings ensuring safety to the gauges and the system
Offline post processing program to analyze results in MS Excel.
Easy to handle and light weight spot welding unit for welding thermocouples on to the specimen
Optional safety enclosures across the test area of the machine
Applications
Axial low cycle fatigue
Characterization of materials under combined thermal and mechanical loading
Thermal cycling
Thermo mechanical cycling with independent phase control
Optional axial torsion testing
Testing of solid and tubular specimens of stainless steel, ferritic steels and their welds
TMF crack initiation in super alloys for gas turbine generators
TMF life prediction of hot section components in jet engines
Combined Thermal and Mechanical Load Testing BI-7020/40-TMF
