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JE SERIES

JE Series

High-Precision Young’s Modulus and Internal Friction Measurement Device

This device employs a measurement method based on the free resonance method specified in ASTM and JIS standards. By utilizing electrostatic force for non-contact excitation and vibration detection, it is possible to obtain pure resonance frequencies. This approach eliminates errors caused by mechanical vibration during internal friction measurement, enabling the accurate measurement of even extremely low internal friction.

JE-RT

JE-RT vibration unit

JE＋JG-HT

Features of JE Series

This device is based on the free resonance method as specified in ASTM and JIS standards, utilizing a free-free suspension to vibrate the specimen. This method is employed to measure the Young’s modulus and natural frequency of materials. The specimen is supported at its nodes, where vibration is minimal; for plates or rods with a uniform cross-section, these support positions are set at approximately 22.4% of the total length.

The suspended-wire method was one of the earliest techniques put into practical use for measuring elastic moduli and is cited in numerous standards such as ASTM and JIS. In this configuration, the specimen is excited via a wire suspended near one node, while vibration is detected near the other node. However, care must be taken as this setup can influence the resonance frequency, potentially causing errors in Young’s modulus measurements. Furthermore, it is noteworthy that this method affects damping during internal friction measurement and imposes certain limitations on the weight and geometry of the specimen.

Fig.1 Free vibration diagram: Uniform cross-section bar

Fig.2 Suspension-wire driven type

Fig.3 JE method

Our JE Series utilizes electrostatic non-contact excitation and non-contact vibration detection, with the specimen positioned at the nodes where no vibration occurs. This method allows for the acquisition of pure resonance frequencies without interfering with vibration during internal friction measurements. This mechanism enables the measurement of minimal internal friction and offers distinct advantages for measurements under specialized conditions, such as high or low temperatures. Furthermore, we have independently developed our own vibration detectors, enabling us to support equipment development across a wide temperature range, from cryogenic to high temperatures.

General Specifications of JE Series

Features

Easy operation and high-precision measurement

Accommodates a wide range of specimen geometries and materials

Ideal for measuring minute internal friction

General-purpose measurement device

Applicable to internal defect detection and quality control of materials

Compliant with a wide range of JIS and ASTM standards

Measurement Items

Young’s modulus, internal friction

Applicable Materials

Isotropic materials

Specimen Geometry

Rectangular: Thickness 0.3-10 mm, Width 3-10 mm, Length 13-130 mm

Cylinder: Diameter 0.3-10 mm, Length 13-130 mm

Temperature change measurement device: Specimen length max. 70 mm

Non-standard dimensions can be measured depending on the material.

Measurement Method

Free resonance natural vibration method

Excitation Method

Contactless electrostatic excitation

Detection Method

Contactless acoustic sensor/Capacitive displacement sensor

Resonant Frequency

600Hz〜20kHz

20kHz〜100kHz(High-vibration model: JEH-RT)

Specimen Support

Simply placed on wires at the vibration nodes

Models

JE-RT (Room temperature)

JE-HT (High temperature: room temperature to 800°C)

JE-LT (Low temperature: -80°C to room temperature)

JEH-RT (Short specimen / High vibration: Room temperature)

Others

Shear modulus and Poisson’s ratio can be determined by adding the JG Measurement Unit.

　*1: Product photos and specifications are subject to change without notice due to improvements.
　*2: The above are standard specifications. Customizations are available upon request.

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