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A Design Method for Fatigue Equal Load Bearing of Butt Welded Joints

A technology of welded joints and design methods, applied in computer-aided design, calculation, instruments, etc., to achieve the effect of improving fatigue bearing capacity

Active Publication Date: 2022-07-05
HARBIN INST OF TECH
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  • 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 Design Method for Fatigue Equal Load Bearing of Butt Welded Joints
  • A Design Method for Fatigue Equal Load Bearing of Butt Welded Joints
  • A Design Method for Fatigue Equal Load Bearing of Butt Welded Joints

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Embodiment Construction

[0065] combine Figure 1-10 The implementation process of a load bearing design method such as fatigue of butt welded joints is described in detail:

[0066] 1. According to the factors affecting the fatigue life of homogeneous materials and heterogeneous materials, it is possible to find a breakthrough in the fatigue bearing capacity of the welded joint and the base metal. 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 influenced by controlling the geometric parameters, thereby improving the fatigue bearing capacity of the material. In addition, the different starting positions of fatigue cracks have no effect on the fatigue behavior of homogeneous materials, but affect the fatigue behavior of heterogeneous materials. Improve the fatigue bearing capacity of heterogeneous materials.

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Abstract

A bearing design method for butt welding joint fatigue and the like relates to the technical field of welding. The purpose of the present invention is to improve the fatigue bearing capacity of the welded joint by designing the geometric shape of the butt welded joint's excess height. The welded joints are abstracted into heterogeneous materials, and the base metal and welding consumables are correspondingly abstracted into homogeneous materials. According to the fatigue failure process of homogeneous materials, the fatigue life estimation method of homogeneous materials based on the nominal stress SN curve is obtained. The life estimation method estimates the number of stress cycles experienced when a fatigue crack expands to a certain size in a homogeneous material. The fatigue life estimation method for homogeneous materials is extended to heterogeneous materials, and a fatigue life estimation method for heterogeneous materials is obtained. Low-alloy high-strength steel Q550 and welding wire ER70S-6 are used as experimental materials to carry out load-bearing design and experimental demonstration of double Y-shaped butt joint fatigue. Fatigue bearing capacity.

Description

technical field [0001] The invention relates to a design method for a butt welded joint, and belongs to the technical field of welding. Background technique [0002] Welded joints have mechanical properties inhomogeneity and geometric discontinuity, which have always been the weak link in engineering structures, especially when they are subjected to fatigue loads, they are often the areas where failure 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 welded joints is generally lower than that of the base metal due to the inhomogeneity of mechanical properties, geometric discontinuity and defects [1-3], and is the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F119/04G06F119/14
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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