Defects imitation in multilayer honeycomb structure from polymer composite materials by honeycomb filler underrating method

Аuthors

Rusakov D. Y.^*, Chernushin V. A.^**

ORPE “Technologiya” named after A.G.Romashin, 15, Kievskoye shosse, Obninsk, Kaluga region, 249031, Russia

*e-mail: tigra47@gmail.com
**e-mail: ximik99911@yandex.ru

Abstract

Nondestructive control is utterly weak part of composite materials quality control. The most general non destructive control method of composite honeycomb structures is acoustic impedance method. To adjust defectoscope control parameters the sample with defects imitation is required.

The article compares the honeycomb underrating method for defects imitation and flat-bottom holes method. Advantages and disadvantages of both methods were analyzed.

The most general defects imitation method is flat-bottom holes method. However, this imitation method has a disadvantage. The defect area on sample larger becomes every time, than the defect area obtained from the mathematical model of this sample. With a honeycomb cell of a big size (the side length of 5 mm or more) this effect becomes rather crucial.

Another problem while applying imitation by flat-bottom holes method consists in impossibility of double-sided sample control. Thus, imitation of both sides is required, that makes the sample size much bigger.

Control of the sample while performing this this operation is realized by ID-91M acoustic impedance defectoscope. Extra control of the sample is performed via radiographic control.

A sample with two types of defect imitation was fabricated especially for this work. All in all, there were four defect imitators by flat-bottom holes method and four by honeycomb underrating method. The area of both pairs of imitators was equal in theory. Nevertheless, results of tests revealed that these areas are not equal. The area of imitators made by honeycomb underrating method was closer to the theoretical area of the defect.

As result of this work, we obtained data, confirming the advantage of the honeycomb underrating method compared to the flat-bottom holes method.

Keywords:

nondestructive testing, polymeric composite materials, defect imitation, free oscillation technique, impedance method

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