Rod type extensometer, crack compression deformation sensor, rangefinder

In recent years, with the continuous development of research on reinforced concrete structures, especially the requirement for in-depth study of the large deformation performance of components (such as the ductility research of seismic and blast resistant structures), it is necessary to measure the entire strain process of concrete and steel bars in the components from the elastic stage to the plastic stage during structural testing. However, the original testing methods (attaching resistance strain gauges or adhesive displacement gauges on steel bars or concrete) can no longer meet the requirements. To this end,Tsinghua University Seismic and Explosion resistant Engineering Research LaboratoryDeveloped a guide rod extensometer. The advantage of the guide rod extensometer is that it can smoothly measure the entire process of the local section of the specimen from elastic to plastic stage. It can measure the strain changes between predetermined gauge lengths in the specimen under any load force. From the signals output by its displacement sensor, physical quantities such as strain, curvature, rotation angle, shear deformation, and relative slip of the specimen can be obtained,Especially when there are gaps, local yielding, or breakage in the specimen material, satisfactory results can still be achieved.

technical indicators

1. Guide rod diameter: ф 5mm

2. Measurement range: ± 5MM, ± 15mm, ± 25mm

3 . Comprehensive error (non-linear): 0.5% F.S

4. Bridge type: Half bridge

5. Bridge supply voltage: recommended 2VDC

6. Temperature range: -25 ° -60 ° C

7. Wire length: 5 meters (can be extended for a fee)

8. Wiring method: Red (Eg+), Blue (Eg -), Black (Vi+)