Computerized wood compression modulus of elasticity testing machine

1. Introductions

The computerized wood grain-to-grain compressive elastic modulus testing machine is equipped with compression test attachment and clamp-type extensometer to measure the wood-grain compressive elastic modulus, that is, when the wood is compressed along the grain, within the proportional limit , the compressive elastic modulus of the wood along the grain is obtained by the ratio of stress to strain. The test of the elastic modulus of wood along the grain adopts a cuboid sample with a sample size of 60x20x20mm. During the test, the test is loaded to the lower limit load at a constant rate, and the deformation value is recorded. Then continue to load at the same loading speed to the upper limit load, record the deformation value, and unload immediately. Repeat the test steps 6 times.

2. relative test method

GB/T 15777 method of determination of the modulus of elasticity in compression parallel to grain of wood

3. Relative manufacturing and calibrating test method for testing machine

GB/T2611 general requirements for testing machines

GB/T16491 electronic universal testing machine

GB/T16825.1 verification of static uniaxial testing machines --- part 1: tension / compression testing machines --- verification and calibration of the force measuring system

ISO7500-1 metallic materials--- verification of static uniaxial testing machine --- part 1: tension / compression testing machines --- verification and calibration of the force measuring system

ASTM E4 standard practice for force verification of testing machines

EN 10002-2 tensile testing of metallic materials --- part 2: verification of the force measuring system of the tensile testing machine

4. working conditions of testing machine

4.1 The room temperature is 10-35℃.

4.2 Relative humidity≤80%.

4.3 There is no vibration around, no corrosive medium, and no strong magnetic field interference.

4.4 The power supply voltage fluctuation should not exceed 10% of the rated voltage.

4.5 Install it horizontally on a solid foundation with a level of 0.2/1000.

5. features of test software

5.1. Automatic stop: After the sample is broken, the moving beam stops automatically;

5.2. Condition storage: The test control data and sample conditions can be made into modules, which facilitates the batch test;

5.3. Automatic speed change: The speed of the moving beam during the test can be changed automatically according to the preset program or manually;

5.4. Automatic calibration: the system can automatically realize the calibration of the indication accuracy;

5.5. Automatic save: After the test is over, the test data and curves are automatically saved;

5.6. Process realization: the test process, measurement, display and analysis are all completed by the microcomputer;

5.7. Batch test: for samples with the same parameters, it can be completed in sequence after one setting

5.8. Test software: WINDOWS interface, menu prompt, mouse operation;

5.9. Display mode: data and curves are dynamically displayed with the test process;

5.10. Curve traversal: After the test is completed, the curve can be re-analyzed, and the test data corresponding to any point on the curve can be found with the mouse;

5.11. Curve selection: Stress-strain, force-displacement, force-time, displacement-time and other curves can be selected for display and printing as required;

12. Test report: The report can be prepared and printed according to the format required by the user;

5.13. Limit protection: with two levels of program control and mechanical limit protection;

5.14. Overload protection: when the load exceeds 3-5% of the maximum value of each gear, it will automatically stop;

5.15. The test results are obtained in two modes, automatic and manual, and reports are automatically formed, which makes the data analysis process simple.

6. specification of testing machine