An ultrasonic Rambo measures the internal stress of plastic thin plate products and methods

A technology of plastic sheet and internal stress, applied in the direction of measuring device, measuring force, instrument, etc., can solve the problem of non-destructive rapid quantitative measurement, etc., and achieve the effect of avoiding errors, avoiding acoustic elasticity coefficient, and high measurement accuracy
CN104807570BActive Publication Date: 2017-10-27BEIJING UNIV OF CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING UNIV OF CHEM TECH
Publication Date
2017-10-27

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Abstract

The invention relates to a device and a method for measuring the internal stress of plastic sheet products by ultrasonic Lamb waves, which belong to the field of material performance testing. The mechanical part of the test device includes a base, a vertical double servo synchronously driven moving component, a horizontal servo moving component and a specimen clamping device; the data acquisition processing and electronic control system transmits the Lamb wave signal on the digital oscilloscope to the computer via USB The processing system processes the amplitude signal to obtain the stress distribution in different areas, and the electronic control system is the control of the servo two-dimensional mobile platform to realize the measurement of different areas. The invention has high degree of integration and simple operation. By calibrating the Lamb wave amplitude electric signal of the standard spline under different stresses, the detection of the Lamb wave amplitude can be used to realize the quantitative measurement of the internal stress distribution of plastic sheet products.
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Description

technical field

[0001] The invention relates to a device and method for measuring the internal stress of plastic thin plate products based on the principle of ultrasonic Lamb wave propagation, belonging to the field of performance detection of plastic thin plates. Background technique

[0002] Plastic thin plate products, especially engineering plastic thin plate products (thickness 0.1 ~ 15mm) are widely used in high-tech fields such as aerospace, automobile industry and medical equipment. However, during the processing and molding process, due to the influence of comprehensive factors such as the cooling rate of the melt in the mold, the uneven flow rate, or the uneven plasticization of the melt itself, internal stress is generated on the surface of the final formed thin plate product. The existence of such internal stress on the surface will cause warping and deformation of the thin plate products and even produce fine cracks on the surface of the products, which will eve...

Claims

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