Four-axis multi-channel stress corrosion/environmental fatigue high-throughput evaluation device

1 Equipment name: Four-axis multi-channel stress corrosion/environmental fatigue high-throughput evaluation device
2 Equipment introduction
The slow strain rate (SSRT) stress corrosion (SCC) testing machine series is mainly used for tensile fatigue testing of materials in corrosive environments.
This series of equipment adopts a frame-type host structure and is generally mainly composed of a loading unit, a test kettle, a fixture, etc.The loading unit can be flexibly installed at the upper or lower end according to test requirements to adapt to the test requirements of different media environments.Depending on the accessories, this series of equipment can be used in a variety of test environments, including various extreme conditions, such as high temperature (up to 600°C), high pressure (up to 25MPa), or other special corrosive media environments.
3 test function
1) Tensile test with ordinary electronic universal testing machine.
2) Constant load creep/stress corrosion test (reserved).
3) 4-axis slow strain rate tensile test.
4) 4-axis crack initiation and fatigue crack growth rate tests.
4 Main technical parameters
load unit
1) Number of loading headers: 4
2) Shaft center distance: 150mm
3) Maximum test force of single axis: 25kN
4) Test force range: 1%～100%F.S.
5) Relative error of test force indication: ±0.5%
6) Maximum moving range of loading head: 80mm
7) Loading head moving speed: 10mm/s～1x10-6mm/s
8) Loading head displacement measurement accuracy: ±0.5%
9) Loading head displacement resolution: 0.0125μm
10) Fatigue loading waveforms: sine wave, triangle wave, trapezoidal wave and half wave
11) Fatigue loading sine wave frequency: 0.001~2Hz.
measuring unit
1) Deformation output range: 0~80mm, subject to the output value of the loading unit.
2) Deformation measurement accuracy: ±0.5%
3) Crack measurement length resolution: 1μm
4) Crack measurement length accuracy: up to 5% in air
test environment
1) Test temperature: normal temperature~350℃
2) Temperature control accuracy: ≤±2℃
3) Temperature control method: electric heating
4) Maximum operating pressure: 20MPa;
5) Experimental kettle volume: about 14L (customized according to actual needs)
5 Test software
Comes standard with slow tensile testing software.According to the functions of the testing machine, creep test software, fatigue test software and crack growth measurement software can be selected.The software features are as follows:
1) Supports metric units and imperial units;
2) Support function navigation, select the corresponding test function according to the navigation interface;
3) Real-time display of force, displacement and deformation values
4) Draw force-displacement curve, force-strain curve, force-time curve, strain-time curve, stress-strain curve, etc. in real time;
5) Support the process design of sample control to facilitate the expansion of test methods;
6) Support slow strain loading control;
7) Support real-time measurement of temperature, pressure, conductivity, pH, DO and other environmental system data; (Water Chemistry)
8) Support accurate prefabricated crack testing; (crack propagation)
9) Supports multi-program segment combination control to achieve a complete test of various toughness and strength indicators of CT specimens under environmental systems in one test; (crack propagation)
10) Supports dynamic loading of full-cycle sine waves, triangle waves, and trapezoidal waves; (fatigue/crack growth)
11) Support half-cycle sine wave dynamic loading; (crack propagation)
12) Support constant K loading control and automatically adjust waveform amplitude; (crack expansion)
13) Support constant amplitude loading control; (crack expansion)
14) Supports dynamic loading frequency in the range of 0.001~2Hz; (fatigue/crack growth)
15) Support real-time collection and display of dynamic loading peak and valley data; (fatigue/crack growth)
16) Supports real-time collection and display of potential data, a/W, Kmax, and calculation of potential sampling standard deviation; (crack expansion)
17) Supports calculation and display of crack growth rate; (crack growth)
18) Supports real-time drawing of crack growth curve; (crack growth)
19) Support real-time drawing of dynamic loading curve; (fatigue)
20) Support the adjustment of control parameters during the test and their immediate application;
21) Support automatic and manual test log recording;
22) Support function recovery after test suspension;
23) Support test recovery function after power failure;
24) Supports retention of collected data after power failure;
25) Support long-term continuous testing of more than 30 days;
26) Test data can be exported to EXCEL and ACCESS formats;
27) Support equipment overload protection and various equipment safety and test safety protections.
6 Equipment Features
1) High rigidity and heavy load frame;
2) High-performance all-digital servo loading control system with high speed control accuracy;
3) The four axes can be loaded separately;
4) Pressure balancing device;
5) Integrated measurement and control system, easy to expand and use;
6) Able to measure crack growth in corrosive media environments.
7) Multi-channel DCPD crack growth measurement system can measure 4 samples at the same time.