SU1504556A2 - Apparatus for fatigue testing of flexible specimens - Google Patents

Abstract

The invention relates to testing equipment, namely, devices for testing flexible specimens for fatigue strength in bending, and is additional to the invention in accordance with the author. swith N 1278671. The purpose of the additional invention is to improve the accuracy by eliminating side-effects in testing samples with spiral structural anisotropy of properties. Two kinematically coupled wheels 1 are installed in the same plane with the possibility of changing the center distance. The wheels are radial spokes 2 with removable grooved rollers 3 for loading the flexible sample 4, which is positioned between the wheels 1 and fixed at one end in the loading device 5, and the other in the movable clip 6 fixed to the axis 7. The bearing 8 is mounted on the axis mounted on the support 9. When the wheels 1 rotate in opposite directions, the sample 4 is loaded with a bend, and the rotation of the sample 4 together with the clamp 6 in the bearing 8 eliminates the influence of side force effects. 1 il.

Description

one

(61) 1278671

(21) 4358943 / 25-28

(22) 01/05/88

(46) 08/30/89. Bup. K 32

(71) Research and development, design and technological cable institute

(72) V.D.Shinov, B.V.Sokhanev and L.A.Bakhsutova

(53) 620.178.4 (088.8)

(56) USSR inventor's certificate 1278671, cl. G 01 N 3/32, 1985.

(54) DEVICE FOR TESTING FLEXIBLE SAMPLES FOR FATIGUE (57) The invention relates to a testing technique, namely, devices for testing flexible specimens for fatigue strength in bending, and is additional to the invention in accordance with the authors. St. No. 1278671. The purpose of the additional invention is to improve the accuracy by eliminating side-effects in testing samples with spiral structural anisotropy of properties. Two kinemats

g

(L

with

14)

The mechanically connected wheels 1 are installed in one plane with the possibility of changing the center distance. The wheels are radial knitting needles 2, with removable grooved rollers 3 for loading the flexible specimen 4, which is located between the wheels and is fixed at one end in the loading device 5, and at the other end

The invention relates to testing equipment, and to devices for testing flexible samples, such as cables and other wire products, for fatigue strength in bending, and is in addition to the author. St. No. 1278671.

The purpose of the additional invention is to improve the accuracy by eliminating side effects when testing samples with spiral structural anisotropy properties.

The drawing shows a diagram of a device for testing flexible fatigue specimens.

The device contains two kinematically connected and located in the same plane wheels 1, which are radial spokes 2 evenly spaced around the circumference, on which removable grooved rollers 3 are installed with the possibility of radial movement. Part of the rollers 3 in the places of the gap form an engagement zone The curvilinear gap in which the sample 4 is located, fixed at one end in the load device 5, and the other in the movable clip 6 fixed on the axis 7. On the axis 7 of the pumping bearing 8, is mounted lenny on D mediated 9. To limit axial movement of the movable clamping device 6 is provided with a device 10.

The device works as follows.

Prior to the test, the wheels 1 are moved apart; on the radial spokes 2, the rollers 3 of the required diameter are installed at the same distance from the center of the wheels 1. One of the ends of the sample 4 is fixed in the movable clamp 6 fixed on the axle 7 and passed into the gap formed between the sliding arm 6, fixed to the axis 7. The axle 8 is mounted on the axle. The bearing 8 is mounted on the support 9. When the wheels 1 are rotated in opposite directions, the sample 4 is loaded with a bend, and the sample rotates together with the clamp 6 in the bearing 8 it eliminates the influence of side force effects Comrade 1 il.

0

five

0

five

five

0

0

five

2, and the other end of sample 4 is fixed in the load device 5. After that, the axial distance of the wheels 1 is reduced to the minimum possible with a given choice of the radius of the rollers 3 and their attachment point on the spokes 2. On the axis 7, fixture 10 is installed to limit the axial movement clamp 6.

When the wheels 1 are rotated in opposite directions, the rollers 3 roll over the flexible sample 4, as a result of which the sample 4 undergoes bending deformations. The resulting internal stresses in sample 4, due to its design feature, cause sample 4 to rotate with clamp 6 in bearing 8.

The choice of the radius of the rollers 3, their attachment points on the spokes 2, the center distance of the wheels 1 allows the deflection and the length of the loading zone of the sample 4 to vary widely.

Claims (1)

The ability of sample 4 to rotate under loading by bending makes it possible to eliminate the influence of side force effects arising from testing samples with a spiral structural anisotropy of properties, and, consequently, to increase the accuracy of the test results. Invention Formula Device for testing flexible fatigue specimens according to avt.S. No. 1278671, characterized in that, in order to increase accuracy by eliminating side-effects in testing samples with a spiral structural anisotropy of properties, it is provided with a bearing with a bearing fixed on the movable clamp coaxially with it, and a device for limiting the axial displacement of the movable clamp.