Primarily, through the transmission shaft and crankshaft in this engineering and mechanical equipment, the majority deformation form is bending and torsion. This product can be used to measure strain, principal stress, and principal stress direction under the combined stresses. It is an ideal tool to solve the problem of composite deformation under combined stresses.
Also, strain measurement technology is one of the main means of stress analysis in engineering structure experiments. It is widely used in mechanical, civil, aerospace, and other engineering fields. For most engineering colleges, bending and torsion combined experiment of a thin-walled cylinder is a basic experiment of the stress test by electrical measurement.
System composition and principle:
This product is designed with an enclosed steel frame and cast composition with careful surface treatment. It is a durable structure. For each type of experiment, the product comes equipped with specimens and surface treatment samples and accessories. The system consists of an experiment bench, Seamless Steel Pipe (hollow shaft), force sensor, strain gauge instrument, strain gauge, cables, etc. The strain instrument can connect to a computer and the data can be recorded as well as processed with our software.
The basic principle of this strain-stress measurement method: measuring a specimen’s surface strain with a strain gauge, then the specimen’s surface stress is determined according to the strain-stress relationship. The strain-stress electrical measurement method is not only used to validate the basic theory of mechanics of materials, to measure the mechanical properties of materials but also is a major engineering testing means for solving engineering problems. It provides a good experimental basis for scientific research.
Contents of Experiments:
1) To master the use of strain rosette.
2)To determine the size and the direction of the principal stress with the electrical test method
3)To measure the bending moment and torque separately under the combined action of the bending and torsion.
| Experimental device:
Dimensions: 520×280×350 mm
Maximum loading: 500N
Maximum loading displacement: 30mm
Overload capacity: 150%
||Seamless Steel Pipe (Hollow Shaft):
Outside diameter: 40mm
Inside diameter: 32mm
Elastic modulus: E=190-210GPa
Poisson’s ratio: µ=0.26-0.33
Measuring range: 500kg
Rated Output: 2.3±0.025mV/V
Input Resistance: 385±10Ω
Output Resistance: 350±3Ω
Excitation Voltage: 10VDC
Screw thread: M16×1.5mm
Depth of the screw thread: 20mm
Temperature Range: -20°C to +60°C
Materials: Alloy Steel, Stainless Steel
Diagram of the force sensor
||Components of the System
Base, support, hand wheel, force sensor, sector arm, thin-walled cylinder, strain instrument