Detection method of residual stress

A detection method and residual stress technology applied in the field of measurement to achieve low requirements, satisfactory accuracy, and intuitive test results

Inactive Publication Date: 2014-01-08
ZTE CORP
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Problems solved by technology

[0004] In view of the problems existing in the residual stress detection method of plastic products in the prior ar

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  • Detection method of residual stress

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Embodiment Construction

[0018] The principle of the residual stress test of the plastic product of the present invention is: the source of the residual stress is mainly the uneven heating of the product and the local force during ejection. Internal stress causes microscopic cracks and density differences on the surface of the product. Under the premise that there is a corrosive agent that can dissolve and penetrate into the plastic, the distribution of residual stress leads to corrosion at different speeds at different locations and promotes the release of internal stress. When the residual stress is too large and the release speed is too fast, the product will break or be severely eroded due to stress release.

[0019] The test method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] (1) Proportioning corrosion solution. Prepare the mixed solution of carbon tetrachloride and n-octane, this two kinds of solutions are mixed by volume r...

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Abstract

The invention discloses a detection method of residual stress, and particularly relates to detection on a plastics product. The detection method comprises the steps of immersing a product to be detected in a corrosion solution, and taking the product to be detected out and detecting whether a residual stress reaction occurs when the immersing time reaches an immersing time set value, wherein if the residual stress reaction does not occur, the product to be detected is qualified. The corrosion solution can be prepared by mixing carbon tetrachloride and normal octane according to the volume ratio of 1:1, or by mixing methylbenzene and normal propyl alcohol according to the volume ratio of 1:3; the immersing time is obtained by processing immersing time within which the stress reaction occurs during pre-detection on products in the same batch, and under the residual stress reaction, the surface of a plastic product cracks or powdery particulate materials are formed on the surface of the plastic product due to corrosion.

Description

technical field [0001] The invention relates to the field of measurement, in particular to a method for detecting residual stress. Background technique [0002] In the injection molding process of engineering plastics, during the process of filling the mold and maintaining pressure, the melt flow produces flow stress and molecular orientation, and the temperature distribution inside and outside the product is uneven during the cooling process, thermal expansion and contraction are limited, and at the same time The action of heat and force, resulting in residual stress. In the use of injection molded products, temperature, humidity, heat, etc. will induce residual stress release. This slow stress release will cause tiny cracks in the part of the product, which not only reduces the mechanical strength, but also leads to the risk of local accelerated oxidation, which may eventually lead to functional failure of the injection molded product. For this reason, it is necessary to...

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Application Information

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IPC IPC(8): G01N21/84
Inventor 尹岭曹雷宋好强
Owner ZTE CORP
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