RU2012111230A - METHOD FOR DELAYING DEVELOPMENT OF DEFECTS IN DESIGNS AND THE KYSKYS DEVICE FOR ITS IMPLEMENTATION - Google Patents

Abstract

1. A method of delaying the development of defects in structures, which consists in fixing the fasteners to structural parts and creating compression stress with the help of spring inserts of the device, characterized in that they pre-stretch the spring insert of the device, fix it in a stretched state, fix the supporting ends of the charged device to opposite from defect in defect-free areas of the part, the spring insert of the device is put into operation, removing the locking elements, while the spring insert of the device two times stretch by the amount that is determined from the condition for compensating for the force lost in the defective area using the formula: where β is the coefficient determining the necessary degree of compensation for loss of bearing capacity; σ is the voltage at a specific point in the defect-free area in the region of the defect under consideration (in the absence of a defect) in the direction of compensation of the acting force; S is the area of the defective region perpendicular to the direction of compensation of the acting force; k is the stiffness coefficient of the ith spring in the spring insert of the devices a; n is the number of springs in the spring insert. 2. The method according to claim 1, characterized in that the coefficient determining the necessary degree of compensation for loss of bearing capacity is prescribed in the range from 1 to 1.5.3. A device for implementing a method for delaying the development of defects in structures, containing a base in the form of paws and a spring, characterized in that the spring insert is made in the form of paws with eyes, on which the ends of the springs are fixed, and the spring insert is fixed in a fixing frame that temporarily holds the spring insert in precede

Claims (10)

1. A method of delaying the development of defects in structures, which consists in fixing the fasteners to structural parts and creating compression stress with the help of spring inserts of the device, characterized in that they pre-stretch the spring insert of the device, fix it in a stretched state, fix the supporting ends of the charged device to opposite from defect in defect-free areas of the part, the spring insert of the device is put into operation, removing the locking elements, while the spring insert of the device dvaritelno stretched by an amount which is determined from the condition that the compensation forces lost in the defective portion according to the formula: $$\Delta L=\beta \frac{{\displaystyle \underset{S_{def}}{\int }\sigma d{S}_{def}}}{{\displaystyle \sum _{\mathrm{one}}^n{k}_i}}$$

, where β is the coefficient determining the necessary degree of compensation for the loss of bearing capacity; σ is the stress at a specific point in the defect-free region in the region of the defect under consideration (in the absence of a defect) in the direction of compensation of the current force; S _def is the area of the defective region perpendicular to the direction of compensation of the effective force; k _i is the stiffness coefficient of the i-th spring in the spring insert of the device; n is the number of springs in the spring insert. 2. The method according to claim 1, characterized in that the coefficient determining the necessary degree of compensation for the loss of bearing capacity is prescribed in the range from 1 to 1.5. 3. A device for implementing a method for delaying the development of defects in structures, containing a base in the form of paws and a spring, characterized in that the spring insert is made in the form of paws with eyes, on which the ends of the springs are fixed, and the spring insert is fixed in a fixing frame that temporarily holds the spring insert in a pre-stretched charged state before it is put into operation. 4. The device according to claim 3, characterized in that a set of helical coil springs are used in the spring insert. 5. The device according to claim 3, characterized in that a set of springs-snake is used in the spring insert. 6. The device according to claim 3, characterized in that the locking frame is generally made in the form of a profile of a U-shaped cross section and has stops for fixing the spring insert in a charged state. 7. The device according to claim 3, characterized in that the locking frame consists of two pivotally connected parts, on each of which a sector with holes is fixed for fixing the relative position of the parts at a given angle between them. 8. The device according to claim 3, characterized in that in the embodiment without a sector of articulated parts are connected by a hinge and a fixing pin. 9. The device according to claim 3, characterized in that in the hinge-free version, the locking frame has locking pins for temporarily holding the springs of the spring insert in a stretched state. 10. The device according to claim 3, characterized in that in the simplest case, the locking frame is an all-metal casing.