HEMT/ DEMT Elastic Modulus Tester

1 Instrument synopsis

The ratio of the stress to strain below the proportional limit is called elastic modulus. It represents the material’s ability to resist deformation, and is an important mechanical parameter to characterize the elastic properties of solid materials, which reflects the ability of solid material to resist deformation.

The elastic modulus is one of the main basis to make the heat stress calculation,calculation of thermal protection and insulation layer and selection of mechanical components of materials. Accurate measurement of elastic modulus is of great significance for both theoretical research and Engineering Technology.At present, the test method of elastic modulus is static method and dynamic method. Static method or dynamic method is used in the our country, and the dynamic method is usually used  in foreign countries.

HEMT/DEMT Elastic Modulus Tester using the impulse excitation method and this is the non-destructive detection method. The natural vibration frequency, dimensions and mass of the specimen are used to calculate the dynamic Young’s modulus.

Main parameter： 

Use: this instrument using the dynamic nondestructive examination test method, can test the refractory’s elastic modulus, for example, high alumina brick, high chrome brick, magnesia brick, magnesia chrome brick, magnesia brick, silicon carbide products ,casting materials,ceramic material and graphite materials. The test condition can be room temperature and elevated temperature.

Standard:ASTM1548-2002 standard test method for dynamic young s modulus, shear modulus, and poisson s ratio of refractory materials by impulse excitation of vibration.

Test type:Young's modulus, Shear modulus and Poisson's ratio, can resolution of multiple peak frequencies(point at material’s macroscopic heterogeneity, crack, defect and so on)

Brief description: The instrument adopt the automatic percussion mechanism, the high temperature tester can automatic heating-up, heat preservation ,frequency acquisition and conversion. The software based on Windows XP system, data processing, mathematical model fitting intelligence,the calculation process can be seen and is automatic.The instrument has high measuring accuracy, any peak frequency and elastic modulus can be read. The defect of specimen structure can be seen from spectrum analysis. The equipment can be widely used in factories, scientific research institutes, product quality inspection departments to do the test of the material’s elastic modulus.

Performance description:

1.The high temperature furnace is a new structure,the test furnace is cylindrical shape.

2.impact device can automatically impact the sample

3.High temperature tester can automatically heat-up, heat preservation and stop.

4.the frequency can be received by the signal collecting device,and the  data can be transformed and analyzed by the software. 

5.Control system adopts industrial IPC computer to carry out automatic control,the software based on Windows XP system,Based on above,wen can Automatic recording test results, intelligent data processing, mathematical model fitting and data processing.

6.Test and calculation of the whole process visualization, automation.

7.The apparatus have high precision and the testing data was exact and reliable.

8.Frequency analysis can help to understand the defect of sample structure, for example,crack, looseness of structure, etc.

9.Can indirect evaluation of refractory’s residual strength before and after thermal shock .  

10.Nondestructive testing and can be carried out continuously.

Patents:

ZL 2009 2 0224346.4 Sample support device for pulse excitation method elastic modulus tester

ZL 2009 2 0224345.X Sample support device for pulse excitation method elastic modulus test instrument

ZL 2009 1 0066230.7 Method and device for sample supporting of elastic modulus test instrument by pulse excitation method

ZL 2010 2 0552484.8 Signal transmitting and receiving device for high temperature elastic modulus testing instrument

Standard:

GB/T 30758-2014/ISO 12680-1:2005 耐火材料 动态杨氏模量试验方法（脉冲激振法）

GB/T 30758-2014/ISO 12680-1:2005 Refractory products--Determination of dynamic Young’s modulus(MOE) by impulse excitation of vibration

ISO 12680-1-2005Methods of test for refractory products--Part 1:Determination of dynamic Young's modulus (MOE) by impulse excitation of vibration

ASTM C 1548-2002Standard Test Method forDynamic Young’s Modulus, Shear Modulus, and Poisson’sRatio of Refractory Materials by Impulse Excitation ofVibration.

Literature:

“Application of high temperature elastic modulus tester for refractory material by pulse excitation method” authors: Li Yonggang, Tan Lihua, Li Xiaorui  -------《Refractory》2011.4

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