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Suspension type static and dynamic material testing machine of tiny tensile

A low-dimensional material and experimental machine technology, applied in the field of experimental mechanics, can solve the problems of unsuitable deformation measurement of large deformation samples, single loading or displacement-driven loading, and small displacement measurement range, so as to achieve reliable measurement results and improve measurement. Accuracy, the effect of reducing systematic errors

Inactive Publication Date: 2005-11-16
TSINGHUA UNIV
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Problems solved by technology

[0004] The problems and defects of the micro-stretching devices reported in the above-mentioned patents and documents mainly include: the first is that the stiffness of the supporting leaf spring is too large (> 100N / m), so that a large part of the electromagnetic driving force will be added Shared by the leaf spring, the load directly acting on the tensile sample is smaller than the applied electromagnetic driving force, which affects the measurement accuracy; second, the loading mode is single, and only a single force loading or displacement driving loading can be realized; three The range of displacement measurement is small, which is not suitable for deformation measurement of samples with large deformation, and the deformation of the sample is obtained indirectly by measuring the displacement of the fixture.

Method used

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  • Suspension type static and dynamic material testing machine of tiny tensile
  • Suspension type static and dynamic material testing machine of tiny tensile
  • Suspension type static and dynamic material testing machine of tiny tensile

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Embodiment

[0025] The parameters of each component in the system are: the rigidity of the supporting suspension spring in this device is less than 5N / m. The inner diameter of the coil is 10mm, the outer diameter is 30mm, the height is 20mm, the number of turns of the coil is 500, and the winding diameter is 0.82mm. The selected permanent magnet has a diameter of 10mm and a height of 10mm. The relationship between the electromagnetic driving force on the magnet and the current is 0.5mN / mA. The displacement range of the capacitive displacement sensor is ±500um, the resolution is ±0.5nm, the capacitance is 20pF-120pF, and a differential capacitance measuring bridge is used. The piezoelectric displacement driver uses low-voltage laminated piezoelectric ceramics, the voltage is 100V, the driving displacement is 15um, the dynamic response time is 50us, and the alternating load frequency is 0-5KHZ. The imaging part of the non-contact optical measurement system is composed of an imaging lens a...

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Abstract

A microforce tensile tester of static and dynamic state in suspension type for testing lower - dimensional material is composed of base, flexible spring of low rigidity, electromagnetic force driving unit, capacity displacement transducer, piezoelectric displacement driver, noncontact optical measuring unit, top and bottom holding device for specimen, three - dimensional accurate translation table and three - dimensional translation regulating device. It has two loading and strain measuring modes for different object and purpose.

Description

technical field [0001] The invention relates to a micro-force stretching experimental measuring device for testing the static and dynamic mechanical properties of low-dimensional micro-scale materials such as films and filaments, belonging to the field of experimental mechanics. Background technique [0002] Low-dimensional materials such as various silicon films, metal films, and various fiber filaments are widely used in microelectromechanical systems (MEMS) and other science and technology. Accurate and reliable testing of the mechanical properties of such materials is not only for MEMS The safety and reliability of the system are very important, and it also has important academic and application value for the research of micro-nano mechanics and material science. Since conventional testing methods are powerless to test the mechanical properties of low-dimensional materials such as films and fibers, it is necessary to design a static and dynamic micro-force tensile test s...

Claims

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Application Information

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IPC IPC(8): G01N3/08
Inventor 戴福隆谢惠民方岱宁潘兵
Owner TSINGHUA UNIV
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