Method for deducing stress intensity factor of butt joint containing I-type center bursts and application

A technology of stress intensity factor and butt joint, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve the problems that the formula of stress intensity factor is not given, and the structural design of butt joint cannot be guided.

Inactive Publication Date: 2013-01-09
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The purpose of the present invention is to provide a derivation method and application of the stress intensity factor of a butt joint containing a type I central crack, so as to solve the problem that the joint with a reinforcement is not provided in the prior art and the butt joint contains a type I central crack and is subjected to tension The stress intensity factor formula under load cannot guide the structural design of butt joints with I-type central penetrating cracks and a certain reinforcement
[0016] The present invention also solves the problem of how to solve the stress intensity factor of a butt joint containing a type I central crack through the working load, crack size and joint shape, and how to use the formula to solve the critical crack size and critical stress of a butt joint containing a type I central crack and the remaining life of the connector

Method used

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  • Method for deducing stress intensity factor of butt joint containing I-type center bursts and application
  • Method for deducing stress intensity factor of butt joint containing I-type center bursts and application
  • Method for deducing stress intensity factor of butt joint containing I-type center bursts and application

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specific Embodiment approach 1

[0101] Specific implementation mode one: as Figure 1~3 As shown, the specific process of the derivation method of the stress intensity factor of the butt joint with type I central crack described in this embodiment is:

[0102] Step 1. Analytical calculation The stress intensity factor formula when only the weld reinforcement h is considered:

[0103] Based on the case of joints with reinforcements containing central cracks (if attached figure 2 shown), it can be seen from any fracture mechanics textbook that for an infinite plate with a central penetrating crack subjected to uniform tensile stress, the Westcrgacrd stress function of the problem is:

[0104] Z I ( z ) = σz z 2 - a 2 - - - ( ...

specific Embodiment approach 2

[0137] Specific implementation mode two: as Figure 1~3 As shown, in this embodiment, the stress intensity factor formula of a butt joint with a type I central crack is used to determine half of the critical crack size of a butt joint with a type I central penetrating crack with a certain reinforcement c ;

[0138] Specific steps are as follows:

[0139] Step 1. Measure the fracture toughness K of the weld material ⅠC ;

[0140] Step 2. Substituting the shape parameters of the joint: the half-width of the capping weld bead w, the weld reinforcement h, the arc transition radius r of the weld toe, and half of the plate thickness t into formula (13) to obtain f;

[0141] Step 3: Establish and calculate half of the critical crack size a of the butt joint with a type I central penetrating crack with a certain reinforcement height c The formula for:

[0142] a c = ( ...

specific Embodiment approach 3

[0145] Specific implementation mode three: as Figure 1~3 As shown, in this embodiment, the critical load σ of the butt joint with a type I central penetrating crack and a certain reinforcement is determined by using the stress intensity factor formula of the butt joint with a type I central penetrating crack and a certain reinforcement c ;

[0146] Specific steps are as follows:

[0147] Step 1. Establish and calculate the critical load σ of the butt joint with a certain reinforcement height of the type I central penetrating crack c The formula for:

[0148] σ c = K IC { 1 + ( 0.85038 + 0.84549 h h ...

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Abstract

The invention relates to a method for deducing a stress intensity factor of a butt joint containing I-type center bursts and application, belonging to the technical field of welding and solving the problems on a solution to the stress intensity factor of the butt joint containing the I-type center bursts by means of work loads, burst dimensions and joint shapes as well as on solutions to criticalburst dimensions, critical stress and residual service life of the butt joint containing the I-type center bursts by using a formula in the specifications. The method comprises the following steps of: firstly, solving a stress intensity factor formula for the butt joint containing the I-type center bursts by using an analysis method when the surplus height of the joint is only considered, then solving a stress intensity factor formula by means of a finite element calculation method and a result regression analysis method when the width of a capping bead and the transition arc radius of a weldtoe are considered, and further determining the stress intensity factor formula of the butt joint containing the I-type center bursts. By applying the formula, the critical burst dimensions, the critical stress and the residual service life of the butt joint containing the I-type center bursts can be further solved. The method is suitable for conditions of any materials of the butt joint containing the I-type center bursts.

Description

technical field [0001] The invention relates to a derivation method and application of a stress intensity factor, in particular to a derivation method and application of a stress intensity factor of a butt joint with an I-type central penetrating crack with a certain reinforcement, and belongs to the field of welding technology. Background technique [0002] Welding is widely used in structural design as a connection method, and the equal matching principle (the strength of the filler material is equal to that of the base metal) is generally adopted for the selection of welding filler materials. Due to its local rapid heating and cooling process, large residual tensile stress is generated in the weld area. In addition, defects such as pores and cracks are prone to occur in the weld, and grains in some areas are coarse. These all make the load-bearing capacity of the weld area It is lower than the bearing capacity of the base metal, and the welded structure is prone to stress...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 杨建国王涛方洪渊刘雪松董志波张勇张敬强王佳杰
Owner HARBIN INST OF TECH
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