SU1589111A2 - Method of investigating strength of welded panel - Google Patents

Abstract

The invention relates to a test technique, is an improvement of the invention according to the author. N1060978 and can be used to study the strength of a welded panel. The purpose of the additional invention is to approximate the test conditions to the operating conditions of the panel. From the welded panel, made in the form of parallel pipes 1-3, interconnected by jumpers 4 and 5, cut out the sample so that it contains an odd number of pipes, for example, three pipes 1-3. In this case, the central pipe 2 has a length of ΔL = (1-2) D longer than the remaining pipes 1 and 3, where D is the diameter of the pipes. Hub 6 and 7 voltages are applied along the interface of the central tube 2 of the sample with jumpers 4 and 5. To supply pressure to the central pipe, fittings 8 and 9 are welded to its ends. The sample is loaded with eccentric tension by applying a load N to the outer pipes 1 and 3 and simultaneously loading the central pipe with internal pressure. First, the load is carried out cyclically with a small loading amplitude until the stresses 6 and 7 form stresses 10 and 11 from the tops of the concentrators 6 and 7. Then the sample is loaded statically, the force corresponding to the crack opening moment 10 or 11, and the crack length welded panel. 2 Il.

Description

interconnected by bridges 4 and 5, cut out the sample so that the fn contains an odd number of pipes, for example, three pipes 1-3. In this case, the central pipe 2 has a length of i 1 (l-2) d larger than the other pipes 1 and 3, where.d is the diameter of the pipes. Along the conjugation of the central tube 2 of the sample with the jumper-fdH 4 and 5, concentrators 6 and 7 voltages are applied. Fittings 8 and 9 are welded to the ends of the 1 | central pipe to its ends. The sample is loaded with eccentric stretching 891114

By applying the load N to the end pipes 1 and 3 and at the same time the central pipe is loaded with internal pressure. First, loading is carried out cyclically with a small loading amplitude until the stresses 6 and 7 form stresses 10 and 11 from the tops of the concentrators 6 and 7. Then, the sample is loaded statically, the force corresponding to the moment of failure is 10 or 11 for the parameters of destruction of the welded panel.

15 2 ill.

The invention relates to a test technique, relates to the improvement of the method according to auth. No. 1060978 And can be used to study the strength of a welded panel.

The aim of the invention is to bring the test conditions closer to the operating conditions of the panel.

FIG. J depicts a test specimen; in fig. 2 - section aa on fig.J,

The method is carried out as follows.

A welded panel, made in the form of parallel tubes 1-3, interconnected by nepeMbiMKaNM 4 and 5, is cut out of the sample so that it contains an odd number of tubes, for example, three tubes (figure 1) The central tube 2 has a length of L1 (l-2) d is larger than the remaining pipes 1 and 3, where d is the diameter of the pipes. Along the conjugation of the central tube 2 of the sample with interchanges 4 and 5, concentrators 6 and 7 are applied;

SRI.

To feed the internal pressure into the central tube 2, fitting 8 and 9 is welded to its ends.

The sample is loaded with eccentric stretching by applying a load of N to the outer pipes 1 and 3 and at the same time loading the central pipe 2 with internal pressure.

. At first, the loading is carried out cyclically with a small loading amplitude until the formation of cones

five

Q

five

five

centralizers 6 and 7 stress fatigue cracks 10. And P.

Growing fatigue cracks 10 and 11 can be carried out in the absence of internal pressure in the central tube 2.

Then the sample is statically loaded, a force is recorded that corresponds to the moment of cracking of -10 and 11, and the length of the cracks, which are taken as the destruction parameters of the welded panel.

Example. They tested a panel of pipes with a diameter of 28 mm with a wall thickness of 4 mm, connected by bridges with a cross section of mm. The length of the concentrators was 30 mm. The stress intensity factor for loading the central tube with internal pressure was 66 Sha. By the method-prototype, an overestimated value of 82 MPa-m was obtained.

Claims (1)

Formula from about req. The method of investigating the strength of a welded panel according to the author f 1060978, characterized in that, in order to bring the test conditions closer to the operating conditions of the panel, the sample is cut so that the central pipe has a length of D 1 (l..2) d larger than the other pipes, where d is the diameter of the pipes, and one- speNieHHo with an embedded tensile panel load / central tube with internal pressure, srig2