WS-MMT3 Bending and Torsion Experiment Bench
First, the transmission shaft and crank shaft and so on in engineering and mechanical equipments, 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 the combined stresses.

Second, strain measurement technology is one of the main means of stress analysis in engineering structure experiment. 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 enclosed steel frame and cast composition with careful surface treatment. It is a durable fastening structure. For each type of experiment, the product equips with specimens and surface treatment samples and accessories. The system consists of experiment bench, Seamless Steel Pipe (hollow shaft), force sensor, strain gauge instrument, strain gage, cables, etc. The strain instrument can connect to a computer and the data can be processed with our software.

The basic principle of this strain-stress electrical measurement method: measuring a specimen's surface strain with strain gage, then the specimen's surface stress state 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 Experiment


To master the use of strain rosette.
(2) To determine the size and the direction of the principal stress with electrical test method
(3) To measure the bending moment and torque separately under the combined action of the bending and torsion.

  Experiment Bench
    Dimension: 520x280x350 mm (20.47x11.02x13.8")
  Maximum loading: 500N
  Maximum loading displacement: 30mm (1.81")
  Overload capacity: 150%
  Weight: 25kg (55.15 lb)
    Diagram of the experiment bench
  Seamless Steel Pipe (Hollow Shaft)
    Outside diameter: 40mm (1.58")
  Inside diameter: 32mm (1.26")
  Length: 348mm (13.70")
  Elastic modulus: E=190-210GPa
  Poisson's ratio: µ=0.26-0.33
  Force Sensor
    Model: KMC-3C/500
  Measuring range: 500kg (1103 lb)
  Rated output: 2.3±0.025mV/V
  Nonlinearity: ±0.03%FS
  Input resistance: 385±10 Ohm
  Output resistance: 350±10 Ohm
  Excitation voltage: 10VDC
  Temperature range: -20°C to +60°C(-4°F to 140°F)
  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

For more information about the system, please contact to