Sample for testing porous material by means of shock compression

FIELD: test technology.

SUBSTANCE: sample for testing porous materials by means of shock compression is made in form of a disc with flat parallel bases and cone side surface. Diameters of bases of disc relate as (7-8):1. Thickness of sample equals to (0,15-0,2) diameter of larger base.

EFFECT: reduced number of tests; improved precision.

2 dwg

 

The invention relates to the field of testing of materials, namely images for testing porous materials by shock compression.

Known sample for testing materials, made in the form of a disk with slits [1]. However, during the loading of this sample shock wave due to the slots and holes distorted field passing shock waves through the thickness of the sample.

Known samples for testing materials shock compression created by the oblique shock wave, made in the form of package inserts of the test material [2, 3]. However, such samples of porous materials or inapplicable, or give too much accuracy in the diagnosis parameters of shock-compressed state.

Known sample for testing materials shock compression, is cylindrical, stepped shape having two cylindrical section of different diameter with flat ends and a flat step between the cylindrical sections parallel to the ends [4]. The big end is loaded by a surface through which is introduced into the sample flat shock wave. In the experience of registered form moving smaller end of the sample. Then, by calculation, determine the speed of sound in the shock-compressed material sample. Defects in the sample are large, the error in determining the speed of sound and a limited range of conditions is s shock compression, where it is possible to test this sample.

Known sample, made in the form of a smooth disk [5]. However, its use for testing porous materials leads to large errors in determining the parameters of shock-compressed material, as a result, distortion of the shock front unloading, spreading from the side surface of the disk.

The closest in technical essence to the invention is a sample for testing materials shock compression is performed in the form of a disk with flat parallel bases and having a tapered side surface forming with a large base drive angle 40-45° [6]. However, its use for testing porous samples leads to considerable error state parameters of shock-compressed porous material and, consequently, to increase the number of tests.

The technical result of the invention is to decrease the amount of testing by obtaining one experience of accurate information about the status parameters of the material.

Figure 1 shows a sample in the form of a disk (3) for testing porous materials: 1 - larger base; 2 - bevel located at an angle α=6-8° to a larger base. This angle is accomplished by setting the ratio of the diameters of the bases (7-8):1 and the ratio of the diameter of the larger base of the disc and the thickness of 5-6.

Technical the ski result is achieved by the sample for testing porous materials shock compression is made in the form of a disk (3) with flat parallel bases and conical lateral surface, with diameters large (1) small bases (4) disc (3) is treated as (7-8):1, and the thickness of the disk (3) has a value of 0.15-0.20 larger diameter of the base (1) disk (3).

When tested flat shock wave effect on small base (4) sample (3) and held in the sample. If the sample (drive) had a cylindrical shape (dashed line in figure 2), as the propagation of shock waves from the side surface into the sample would be covered by the discharge, the rarefaction wave. Its influence leads to the fact that in the area covered by the lateral unloading, the shock wave front slows down. As a result, in this area the front is bent. The size of the area covered by the lateral unloading, characterized by the angle γ - lateral unloading. For solid materials is γ does not exceed 39° [7]. For porous materials, the value varies from 82° (compression of these materials weak shock waves with small amplitude) up to 35°16' (if the compression is strong shock waves with a large amplitude) [8]. While providing the above geometrical dimensions of the sample of porous material remains undistorted planar shock front during the entire process nerasprostranenia on the thickness of the sample, since this eliminates the influence of lateral unloading and parameters of the wave front is constant and identical for all cross-sections of the sample.

Sources of information

1. USSR author's certificate for invention №415546, CL G 01 N 1/28, 1975.

2. Havesuggested and other parameters of the non-one-dimensional shock waves in aluminum. // Applied mechanics and technical physics. - 1971, No. 4, p.148-152.

3. USSR author's certificate for invention №748172, CL G 01 N 1/28//G 01 N 3/30, 1980.

4. For theoretical physics, Y.P. Raizer. Physics of shock waves and high temperature hydrodynamic phenomena. - M.: Nauka, 1966, s-582.

5. J. John Taylor. Resudual Temperature of Shocked Copper. // Journal of Applied Physics - 1963, v. 34, No. 9 - p. 2727.

6. USSR author's certificate for invention №619822, .G 01 N 1/28 // G 01 N 3/30, 1978 (prototype).

7. A.P. Fishermen. Sound velocity in shock-compressed solids. Solid matter // Physics of combustion and explosion, 1978, t, B.1, pp.109-113.

8. A.P. Fishermen. Sound velocity in shock-compressed solids. The porous substance // Physics of combustion and explosion, 1978, CH, No. 2, pp.118-120.

The sample for testing porous materials by shock compression, made in the form of a disk with flat parallel bases and conical lateral surface, characterized in that the diameters of the bases are related as (7÷8):1, and the thickness of the sample has a value of 0.15÷0.2 diameter of the large base.



 

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