Introduction
In bridges, building structures, and other engineering projects, pure bending deformation is very common. In this experiment, strain and deflection are measured to analyze the basic properties of structures and materials. If the equipment is slightly modified, you can perform the experiment of bar stability, concentric tension and compression, eccentric tension and compression, and so on. The experiment enables students to learn the dialectical relationship between theory and practice but also enhances their practical abilities.
System Composition and Principle
This product is designed with an enclosed steel frame and cast composition with careful surface treatment. It is a durable fastening structure. For each type of experiment, the product comes equipped with specimen and surface treated samples and accessories. The system consists of Base, Pure Bending Beam, Sensor, Strain Instrument, Strain-Gauge, wires, and so on. The strain instrument can connect to a computer and the data can be 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 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) | Normal stress regularity distribution in cross-sections of pure bending beams |
| 2) | Strain gauge sensitivity coefficient calibration |
| 3) | Elastic modulus and Poisson’s ratio determination |
| 4) | Eccentric tension determination |
| 5) | Bar stability Test |
Specifications:
| Experimental device | ||||
| 1. | Experiment Bench Dimension: 700×450×1015mm Loading speed: 0.12mm/r Maximum loading displacement: 50mm Overload capacity: 150% Weight: 45kg |
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| 2. | Three-point Deflectometer: Dial Indicator Measuring range: 0~10mm Resolution: 0.01mm Support Span: 200mm
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| 3. | Tensile Specimen Maximum loading: 5000N Dimension: 170×30×5mm Elastic modulus: E=190~210GPa Poisson’s ratio: µ=0.26~0.33 |
Diagram of the Tensile Specimen
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| 4. | Force Sensor Model: KMC-3C/1000 Measuring range: 1000kg Rated Output: 2.3±0.025mV/V Nonlinearity: ±0.03%FS Input Resistance: 385±10Ω Output Resistance: 350±3Ω Excitation Voltage: 10VDC |
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| Screw thread: M16×1.5mm Depth of the screw thread: 20mm Temperature Range: -20°C to +60°C Materials: Alloy Steel, Stainless SteelDiagram of the force sensor  |
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| 5. | Pure Bending Beam Dimension: 700×20×40mm Maximum loading: 5000N Elastic modulus: E=190~210GPa |
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| 6. | Calibration Beams Dimension(mm): 700×15×40 Maximum loading: 1500N Elastic modulus: E=190~210GPa Poisson’s ratio: µ=0.26~0.33 |
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| 7. | Components of the System Beam, Support feet, Hand Wheel, Box, Worm Lifting Devices, Sensor, Rod, Indenter, Bearing Beam, Base, Castor, Support, Strain Instrument. |
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