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A fatigue bearing design method of butt weld joint

A technique for welding joints, design methods, used in computing, special data processing applications, instruments, etc.

Active Publication Date: 2019-01-18
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the prior art, no breakthrough has been found for the fatigue bearing capacity of the welded joint and the base metal based on the factors affecting the fatigue life of homogeneous and heterogeneous materials

Method used

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  • A fatigue bearing design method of butt weld joint
  • A fatigue bearing design method of butt weld joint
  • A fatigue bearing design method of butt weld joint

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Experimental program
Comparison scheme
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Embodiment Construction

[0065] combine Figure 1-10 Describe in detail the implementation process of a fatigue load bearing design method for butt welded joints:

[0066] 1. According to the factors affecting the fatigue life of homogeneous materials and heterogeneous materials, it is possible to find a breakthrough where the welded joint and the base metal have a considerable fatigue bearing capacity. Since the fatigue life of homogeneous materials and heterogeneous materials is related to the stress distribution state, and the stress state of the material is determined by the geometric parameters, the stress state of the material can be affected by controlling the geometric parameters, thereby improving the fatigue bearing capacity of the material. In addition, different starting positions of fatigue cracks have no effect on the fatigue behavior of homogeneous materials, but affect the fatigue behavior of heterogeneous materials. Therefore, the proportion of each component material on different cra...

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Abstract

A fatigue bearing design method butt weld joint relates to that technical field of weld. The object of the present invention is to improve the fatigue bearing capacity of a butt weld joint by designing the geometry of the residual height of the butt weld joint. The weld joint is abstracted into a heterogeneous material, Based on the fatigue failure process of the homogeneous material, the fatiguelife estimation method of the homogeneous material based on the nominal stress SN curve is obtained, and the fatigue life estimation method is used to estimate the number of stress cycles when the fatigue crack propagates in the homogeneous material with a certain size. The fatigue life estimation method of homogeneous materials is extended to heterogeneous materials, and the fatigue life estimation method of heterogeneous materials is obtained. Using low alloy high strength steel Q550 and welding wire ER70S-6 as experimental material, fatigue bearing design of double Y-shaped butt joint and experimental demonstration is carried out, and that fatigue design of the welding joint provided by the invention is feasible, and the weld joint can have fatigue bearing capacity equivalent to that ofthe base metal.

Description

technical field [0001] The invention relates to a design method for a butt welding joint, and belongs to the technical field of welding. Background technique [0002] Welded joints have non-uniform mechanical properties and geometric discontinuities, which have always been the weak link in engineering structures, especially when subjected to fatigue loads, they are often the areas where damage occurs preferentially in engineering structures. [0003] In the traditional concept, the existence of welded joints will reduce the fatigue bearing capacity of the overall engineering structure. The so-called fatigue bearing capacity refers to the maximum number of stress cycles that a material can experience under a certain fatigue load, that is, the fatigue life. This is because the fatigue bearing capacity of the welded joint is generally lower than that of the base metal due to the inhomogeneity of mechanical properties, geometric discontinuity and defects [1-3], and it is the ar...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 温学王苹董志波方洪渊刘永于谊飞
Owner HARBIN INST OF TECH
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