Various corrosive environment media Slow strain rate stress corrosion testing machine

1. Equipment introduction

Slow strain rate stress corrosion testing machine (seawater immersion, salt spray, high and low temperature moist heat slow tensile, crack propagation)Mainly used for tensile testing of materials in corrosive environments.
The equipment adopts a frame-type host structure and is generally mainly composed of an independent 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.
This product is used for seawater immersion corrosion, salt spray corrosion, and slow tensile and crack propagation corrosion tests in high and low temperature humid and hot environments under normal temperature and pressure environmental conditions. It is equipped with a water circulation system suitable for seawater environments and a DCPD crack propagation measurement system.

2. Test function

1) Tensile test with ordinary electronic universal testing machine.
2) Constant load creep/stress corrosion test.
3) Slow strain rate tensile test.
4) Measurement of crack initiation and crack growth rates.
5) Soak test.
6) Salt spray test.

3. Technical parameters

1) Maximum test force: 50kN

2) Test force range: 1%～100%F.S.

3) Relative error of test force indication: ±0.5%
4) Maximum moving range of loading head: 80mm
5) Loading head moving speed: 10mm/s～1x10^-6mm/s
6) Loading head displacement measurement accuracy: ±0.5%
7) Loading head displacement resolution: 0.0125µm
8) Grating deformation measurement range: 0~30mm
9) LVDT deformation measurement range: ±12.7mm
10) Deformation measurement resolution: 1µm
11) Deformation measurement accuracy: ±0.5%
12) Fatigue loading frequency: 0.001~2Hz

4. Introduction to environmental systems

This testing machine is equipped with three different test environments, which can be used in conjunction with the loading unit respectively.

1) Soaking environment

2) Salt spray environment

3) High and low temperature humidity and heat box

5. Equipment characteristics

1) High rigidity and heavy load frame;
2) High-performance all-digital servo loading control system with high speed control accuracy;
3) Double deformation sensors can be used to eliminate the influence of lateral deflection of the tie rod;
4) Integrated measurement and control system, easy to expand and use;
5) It can realize crack growth measurement in corrosive medium environment.

6. Characteristics of test software

Equipped with slow tensile, creep test software and crack growth measurement software.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 environmental system data such as temperature, pressure, conductivity, pH value, DO;
8) Support accurate prefabricated crack testing;
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;
10) Supports dynamic loading of full-cycle sine waves, triangle waves, and trapezoidal waves;
11) Support half-cycle sine wave dynamic loading;
12) Support constant K loading control and automatically adjust waveform amplitude;
13) Support constant amplitude loading control;
14) Support dynamic loading frequency in the range of 0.001~1Hz;
15) Support real-time collection and display of dynamically loaded peak and valley data;
16) Supports real-time collection and display of potential data, a/W, Kmax, and calculation of potential sampling standard deviation;
17) Support crack growth rate calculation and display;
18) Supports real-time drawing of crack growth curve;
19) Supports real-time drawing of dynamic loading curves;
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.