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首页> 外文期刊>Measurement Science & Technology >Triaxial extensometer for volumetric strain measurement in a hydro-compression loading test for foam materials
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Triaxial extensometer for volumetric strain measurement in a hydro-compression loading test for foam materials

机译：三轴引伸计，用于泡沫材料的水压载荷试验中的体积应变测量

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摘要

A new strain gauge-based triaxial extensometer (radial extensometers x, y and axial extensometer z) is presented to improve the volumetric strain measurement in a hydro-compression loading test for foam materials. By the triaxial extensometer, triaxial deformations of the foam specimen can be measured directly, from which the volumetric strain is determined. Sensitivities of the triaxial extensometer are predicted using a finite-element model, and verified through experimental calibrations. The axial extensometer is validated by conducting a uniaxial compression test in aluminium foam and comparing deformation measured by the axial extensometer to that by the advanced optical 3D deformation analysis system ARAMIS; the result from the axial extensometer agrees well with that from ARAMIS. A new modus of two-wire measurement and transmission in a hydrostatic environment is developed to avoid the punching and lead sealing techniques on the pressure vessel for the hydro-compression test. The effect of hydrostatic pressure on the triaxial extensometer is determined through an experimental test. An application in an aluminium foam hydrostatic compression test shows that the triaxial extensometer is effective for volumetric strain measurement in a hydro-compression loading test for foam materials.
机译：提出了一种新的基于应变仪的三轴引伸计（径向引伸计x，y和轴向引伸计z），以改善泡沫材料的水压载荷试验中的体积应变测量。通过三轴引伸计，可以直接测量泡沫样品的三轴变形，从而确定体积应变。使用有限元模型预测三轴引伸计的灵敏度，并通过实验校准对其进行验证。轴向引伸计通过在泡沫铝上进行单轴压缩测试，并将轴向引伸计测得的变形与先进的光学3D变形分析系统ARAMIS进行比较，从而验证了轴向引伸计的有效性。轴向引伸计的结果与ARAMIS的结果非常吻合。开发了一种在静水环境中进行两线制测量和传输的新方式，以避免在压力容器上进行水压试验的冲压和铅封技术。静水压力对三轴引伸计的影响是通过实验测试确定的。在泡沫铝的静水压试验中的应用表明，三轴引伸计在泡沫材料的静水压试验中对体积应变的测量是有效的。

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