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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

Active Publication Date: 2017-10-27
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The purpose of the present invention is to provide a device and method for measuring the internal stress of plastic sheet products by ultrasonic Lamb wave, which can not realize the non-destructive and rapid quantitative measurement of different regions in view of the existing device for measuring the internal stress of plastic sheet products. The propagation characteristics of M-wave in thin plate medium, based on the Clapeyron strain energy principle and the theory of the relationship between the structure and performance of polymers, through the horizontal and vertical servo motors to drive the movement of the two-dimensional platform of the plastic sheet product fixture, to realize the plastic sheet product Quantitative determination of stress distribution

Method used

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

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Experimental program
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Effect test

Embodiment

[0065] The Lamb wave amplitude attenuation of the sample was measured with the above-mentioned Lamb wave method polymer thin plate internal stress measuring device.

[0066] 1) Injection molding a number of plastic sheets to be tested and a number of standard tensile splines, and annealing the standard splines to remove stress as stress-free standard splines;

[0067] 2) Apply tensile stress and compressive stress to the unstressed standard spline through the tensile and compressive stress calibration device, and at the same time use the Lamb wave transmitting and receiving device to measure the Lamb wave voltage signal amplitude of the standard spline per unit length under different stress values, In this way, the functional relationship between the amplitude of the Lamb wave voltage signal and the stress of the test piece is found, and this functional relationship is used as a calibration benchmark.

[0068] 3) Carry out grid division to the tested piece, take the unit lengt...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/25
Inventor 许红黄尧胡宁吴大鸣张岩刘颖张亚军赵中里庄俭郑秀婷
Owner BEIJING UNIV OF CHEM TECH
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