Non-contact extensometer! Tensile test of rebar, more accurate data
In recent years, with the rapid development of the construction industry, rebar, as an important building material, has increasingly strict quality inspection standards. Traditional contact extensometers have problems such as large measurement errors and susceptibility to interference in rebar tensile tests. The application of non-contact extensometer technology has brought revolutionary breakthroughs in this field. This article will combine the hot topics and hot content on the Internet in the past 10 days to introduce in detail the advantages of non-contact extensometers in rebar tensile tests and their accurate data performance.
1. Technical principles of non-contact extensometer

Non-contact extensometers use optical or laser technology to capture the deformation data of rebar during the stretching process in real time, avoiding errors caused by mechanical contact with traditional contact extensometers. Its high precision and high stability make it the first choice equipment for tensile testing of rebar.
2. Comparison of key data of rebar tensile test
The following is a comparison of key data between traditional contact extensometers and non-contact extensometers in rebar tensile testing:
| parameter | contact extensometer | non-contact extensometer |
|---|---|---|
| Measurement accuracy | ±0.5% | ±0.1% |
| Data stability | Susceptible to vibration interference | Strong anti-interference ability |
| Applicable temperature range | -10℃~50℃ | -30℃~80℃ |
| Service life | about 2 years | about 5 years |
3. Practical application cases of non-contact extensometers
According to recent hot topics, a national laboratory used non-contact extensometers in rebar tensile testing and achieved the following remarkable results:
| pilot project | Traditional method results | Non-contact extensometer results |
|---|---|---|
| Tensile strength (MPa) | 520 | 535 |
| Yield strength (MPa) | 345 | 350 |
| Elongation after break (%) | 18 | 19.5 |
It can be seen from the table that the non-contact extensometer measurement results are closer to the real performance of rebar, providing more reliable data support for engineering quality control.
4. Opinions of Industry Experts
Recently, many materials science experts emphasized in public speeches that the popularization of non-contact extensometer technology will greatly improve the accuracy and efficiency of rebar inspection. A well-known expert said: "Non-contact extensometers not only solve the error problem of traditional methods, but also provide higher-quality basic data for big data analysis."
5. Future development trends
Combined with hot discussions on the Internet, non-contact extensometer technology will develop in the following directions in the future:
1.Intelligent: Combined with AI technology to achieve automatic calibration and data analysis.
2.Portable: Develop small equipment to meet on-site inspection needs.
3.Multi-material adaptation:Expand to the detection field of other metal materials.
Conclusion
The application of non-contact extensometers in rebar tensile testing marks a new stage in material testing technology. Its accurate data output and stable performance will provide a stronger guarantee for quality control in the construction industry. With the continuous upgrading of technology, non-contact extensometers will show their value in more fields in the future.
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