The in-situ tensile fatigue testing machine is an important equipment used to evaluate the fatigue performance of materials under repeated tensile loads, and its usage process is crucial to ensure the accuracy and reliability of test results. The following is the detailed usage process of the in-situ tensile fatigue testing machine:
1. Preparation before the experiment
-Environmental and equipment inspection: Ensure that the testing machine is installed in a stable, vibration free, and well ventilated environment. Check if the power supply voltage meets the equipment requirements (usually 380V or 220V), and ensure reliable grounding. Clean the workbench and surrounding area to avoid interference from debris.
-Equipment component inspection: Check whether the oil level of the hydraulic system (if any) is normal and whether there is any leakage in the pipeline. Confirm that the sensors, fixtures, and connectors are not loose or damaged. Lubricate key parts (such as guide rails and bearings) to ensure the flexibility of moving parts.
-Sample preparation: Process the sample according to the test standards, check the sample size, and ensure that there are no defects on the surface. Ensure alignment when installing the sample, avoid eccentric loads, and select appropriate fixtures according to the instructions.
2. Parameter settings
-Software parameter input: Open the control software and input test parameters, such as load waveform, frequency, number of cycles, stress ratio, etc. Set safety protection values, such as overload shutdown, displacement limit, etc.
-Validation parameters: After inputting the experimental parameters, perform a small load preload (10%~20% rated load) and observe whether the data feedback is normal. Confirm the stability of sensor signals such as load, displacement, and strain.
3. Start the experiment
-Start equipment: Turn on the main power switch, start the control system, and preheat the equipment (if required). Conduct a no-load test run to confirm that all components are functioning properly.
-Install the sample: Use specialized tools to secure the sample, ensuring a firm clamping and even force distribution. Check the coaxiality of the sample with the sensor and actuator, and use a centering device if necessary.
-Start the experiment: Start the test program and select automatic or manual mode. Real time monitoring of load displacement curves, cycle times, and equipment status, recording abnormal situations.
4. Monitoring of the experimental process
-Close observation: Observe whether the sample shows signs of failure such as cracks and deformation. Personnel are prohibited from approaching operating equipment to prevent sample breakage and splashing.
-Exception handling: When abnormal vibration, noise, or data is detected, immediately press the emergency stop button. In case of sudden power outage, turn off the main power supply to avoid equipment misoperation after power restoration.
5. End of experiment and data processing
-Shutdown operation: After reaching the preset number of cycles or sample failure, the equipment automatically stops and gradually unloads the load. Close the control software, cut off the power, and clean the sample fragments.
-Data saving: Export test data (load time curve, fatigue life, etc.) and backup it to the designated storage device. Fill in the test record form, including sample number, parameter settings, abnormal conditions, etc.
-Equipment reset: Restore the actuator and fixture to their initial positions and clean the workbench. Check the device status and fill in the device usage log.
6. Maintenance and upkeep
-Daily maintenance: Clean the equipment surface of oil stains and dust after each test. Regularly check the condition of hydraulic oil and lubricating grease, and replace them periodically.
-Regular calibration: Calibrate load sensors and displacement sensors every 6 months or 500 hours. Check the accuracy of the control system to ensure data reliability.
By strictly following the above usage process, the normal operation of the in-situ tensile fatigue testing machine and the accuracy of the test results can be ensured, while extending the service life of the equipment.