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| New Method for On-line Measurement of Spring Load during Stress Relaxation |
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| DOI：10.7643/issn.1672-9242.2023.04.011 |
| KeyWord:spring stress relaxation on-line measurement periodic test method continuous test method test efficiency |
| Author | Institution |
| SU Yi |
School of Materials Science and Engineering, Xihua University, Chengdu , China |
| WANG Xin-yu |
School of Materials Science and Engineering, Xihua University, Chengdu , China |
| RAN Wei |
School of Materials Science and Engineering, Xihua University, Chengdu , China |
| WANG Meng-jia |
School of Materials Science and Engineering, Xihua University, Chengdu , China |
| SONG Kai-qiang |
Southwest Institute of Technology and Engineering, Chongqing , China |
| HE Yi |
School of Materials Science and Engineering, Xihua University, Chengdu , China |
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| Abstract: |
| The work aims to accurately and efficiently measure the spring load during the stress relaxation. In view of the tedious disassembly work in periodic test method and the low efficiency in continuous test method, and based on the fact that the "total shape variable of the spring can be changed in a short time" in the periodic test method, the spring to be measured was driven to further have a small amount of deformation, so the quasi invariant load of the spring to be measured was converted into the continuous variable load of the buffer spring for measurement. After the measurement, the driving force F0 could be obtained by fitting the straight lines, and then the load of the spring to be measured in the clamping state could be calculated. A new method of measuring spring load in stress relaxation was proposed. Then, the two implementation methods of this new method were introduced in combination with the structural characteristics of spiral compression spring. When the confidence was 0.95, the confidence interval of the test results was within ±2%, indicating that the measurement results had high reliability. It is shown that the new method can avoid the tedious disassembly process and reduce the human error in the periodic test method, and improve the test efficiency in the continuous test method, thus effectively solving the load test problem during the stress relaxation. |
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