Damage and fatigue life evaluation method based on crystal plastic welding process model

Abstract

The invention discloses a damage and fatigue life evaluation method based on a crystal plastic welding process model. According to a crystal plastic constitutive model of the welding process and the calculation method, the influence of a crystal slip system and polycrystalline plastic strain on the welding process performance of the material is considered. A mesoscopic layer welding process damageand fatigue life evaluation model is established. The influence of the microscopic characteristics of the material on the welding process performance and the influence on the damage and fatigue lifeof a welding joint can be researched from the perspective of mesoscopic view. Through a macro-mesoscopic coupling calculation model, the relationship between welding process and material property evolution process is clarified, and the influence and degree of welding process on material damage and fatigue life are further determined, which provides important for studying the damage evolution and fatigue failure process of materials after welding process. The method has important scientific significance and engineering application value.

Description

technical field [0001] The invention relates to the technical field of material fatigue failure, in particular to a method for evaluating damage and fatigue life based on a crystal plastic welding process model. Background technique [0002] The emergence of welding technology has made it possible for large-scale parts production and engineering applications. At present, welding technology is more and more used in various industries. However, engineering practice and research have found that the position of welded joints in welded components is often the weakest place in mechanical properties, and it is also the area where fatigue crack initiation and failure occur. Therefore, it is an important scientific issue and has engineering application value to study the influence of welding process on mechanical properties, especially on fatigue behavior. [0003] Experimental testing has always been the basic method to study the weldability, reliability and fatigue of welded joint...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a damage and fatigue life assessment method based on the crystal plastic welding process model, which solves the problem that the macro-mesoscopic coupling behavior and material damage and fatigue life prediction cannot be considered in the numerical calculation of the welding process. The problem

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