SU1295304A1 - Method of destruction testing of brittle materials - Google Patents

Abstract

The invention, related to testing equipment, is intended to test for the destruction of brittle materials and improves the accuracy of the test for the destruction of brittle materials reinforced with fiber, by taking into account the phase surface of the reinforcing fibers. At least two samples are used, the main material of which is reinforced with fibers with a different phase surface. The samples are destroyed with an erect copra. Measured at the destruction of each of the samples, respectively, the magnitude of the work expended W, V7, the area S ,, S of destruction and the magnitude of the phase surface SJI of reinforcing fibers. Next, determine the amount of irreversible work ijfi for the destruction of brittle material and the specific work for the destruction of the adhesion boundary of reinforcing fibers and brittle material from the ratios S, y + fi, y, W ;, W according to which adhesion is judged. (L 1C ate 00

Description

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The invention relates to testing equipment, and specifically to methods for testing the destruction of brittle materials.

The purpose of the invention is to improve the accuracy of the fracture testing of brittle materials reinforced by fibers by taking into account the phase surface of the reinforcing fibers.

The method is carried out as follows.

Reinforcement fibers are introduced into an artificial fragile material using one of the known methods. At the same time, at least two samples are used, into which reinforcing fibers with a different phase surface are introduced. The obtained samples are destroyed with the help of a tiller machine;

In this way, the destruction of samples of reinforced materials is slower, and the energy that is destroyed by an order of magnitude exceeds the energy of destruction of unreinforced material, which allows measurement with a high degree of accuracy. Measurement of each of the samples during destruction of W (JI 1-7 (2. area S and S l destruction-

20

sheni ti SL

and the size of the phase surface-, Q2 reinforcing fibers and determine the amount of irreversible work. fracture of brittle material and efficient operation Ji destruction of the adhesive boundary of reinforcing fibers and brittle material from ratios

35

y t

S2,} W QO W

2

Determining the magnitude of the irreversible work jl and the specific work 1, separated from the total work W of destruction of samples of reinforced materials, which consists of the process of formation of new surfaces of the base material and separation of the interfacial boundary of the base material and the reinforcing fibers, makes it possible to objectively judge adhesion, which is accurate tests.

Example. To measure the specific work of the destruction of cement stone, samples of cement paste q were molded to include 10% by volume of dispersed fiberglass with a diameter of 20 microns and a length of sections of 10 mm.

five

Q

0

(first series) and the inclusion of 5% of the same fiber (second series). Samples have a prismatic shape and dimensions 4 x 4 x 16 cm. I

Obdztsy destroyed ballistic master. For samples of the first series, the destructive work value of 27.3 for the second is obtained - 12.7 J.

With the destruction, two new surfaces are formed in the samples on the cement stone. The surfaces have an area: 1-series 2 x 27.4 54.8 and 11-series 2 X 18.6 33.2 cm.

The area is determined by coordinate measurement of the reference points (grid 10 x X 10 mm) by a comparator and counting on a wrapping polyhedral surface.

The number of fibers protruding beyond the broken section, spun from the base material, is on average 14 per 1 mm for the first series and 6.5 for the second series. There are no fiber breaks in the cross sections. The number of fibers is measured using a measuring microscope with a magnification of 150x. The average length of the segments of the stripped fibers is 5 mm.

The phase surface of the destruction is for samples of series I

Samples II

.2

a 70.34 and for

Series 2 32.66 cm. The equations determine V = 0.153 N / cm.

From system T 0.0517 and

0

five

0

Claims (1)

Claim Method A method for testing the destruction of brittle materials based on reinforcing a material with fibers and determining the work expended on destroying a sample of reinforced material and the area of destruction that are judged for adhesion, characterized in that, in order to improve the accuracy of the test, at least two samples with different phase surfaces of the reinforcing fibers, and the parameters of the adhesive interaction determine the amount of irreversible work and the specific work jji from the ratios + a, 5 2 W 2W W one where w., w, - the value of the total work expended on the destruction of the first and second 3112953044 samples of the corresponding-3, 9. - phase coarseness value; reinforcing surfaces S ,. Sj is the destruction area of the fibers of the first and second and second orbits of the corresponding samples, respectively; 5th. Compiled by V.Sviridov Editor E.Papp Tekhred I.Popovich Proofreader G.Reshetnik Order 612/51 Circulation 777 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Production and printing company, Uzhgorod, st. Project, 4