Numerical analysis on the creep-fatigue damage of titanium alloy deep-sea pressure hull at room temperature

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures Pub Date : 2024-05-24 DOI:10.1016/j.marstruc.2024.103639

Yuhao Guo , Gang Liu , Jiacheng Xu , Tianzhen Jiao

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引用次数: 0

Abstract

Titanium alloy deep-sea pressure hull suffers from room-temperature creep-fatigue problem. Room-temperature creep damage significantly reduces the fatigue life of titanium alloy deep-sea pressure hull. In order to analyze the room-temperature creep-fatigue failure process of titanium alloy pressure hull, a room-temperature creep-fatigue damage model in three-dimensional stress space is proposed. Numerical simulation of the model is implemented based on the finite element method. The accuracy of the proposed damage model as well as the numerical method is verified by carrying out the creep-fatigue crack propagation test on CT specimen of titanium alloy at room temperature. It is concluded that the proposed damage model and numerical method can accurately describe the room-temperature creep-fatigue failure process of titanium alloy structures. Creep-fatigue hotspot of the cone–cylinder pressure hull is located on the tensile side of the outer wall. The creep damage accumulated during the crack initiation stage needs to be considered when analysing creep-fatigue crack propagation process of pressure hull. The creep-fatigue cracks propagate in the circumferential and radial directions from the point of initiation. In the later stage, the circumferential propagation rate is significantly faster than the radial propagation rate. The crack surface develops into a long stripe.

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室温下钛合金深海压力船体蠕变疲劳损伤的数值分析

钛合金深海压力船体存在室温蠕变疲劳问题。室温蠕变损伤大大降低了钛合金深海压力船体的疲劳寿命。为了分析钛合金压力船体的室温蠕变疲劳失效过程，提出了三维应力空间的室温蠕变疲劳损伤模型。基于有限元法对模型进行了数值模拟。通过对钛合金 CT 试样进行室温蠕变疲劳裂纹扩展试验，验证了所提出的损伤模型和数值方法的准确性。结论是所提出的损伤模型和数值方法能准确描述钛合金结构的室温蠕变疲劳破坏过程。锥筒压力船体的蠕变疲劳热点位于外壁的拉伸侧。在分析压力舱蠕变疲劳裂纹扩展过程时，需要考虑裂纹萌发阶段积累的蠕变损伤。蠕变疲劳裂纹从起始点开始向圆周和径向扩展。在后期阶段，周向扩展速度明显快于径向扩展速度。裂纹表面发展成长条状。

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来源期刊

Marine Structures 工程技术-工程：海洋

CiteScore

8.70

自引率

7.70%

发文量

157

审稿时长

6.4 months

期刊介绍： This journal aims to provide a medium for presentation and discussion of the latest developments in research, design, fabrication and in-service experience relating to marine structures, i.e., all structures of steel, concrete, light alloy or composite construction having an interface with the sea, including ships, fixed and mobile offshore platforms, submarine and submersibles, pipelines, subsea systems for shallow and deep ocean operations and coastal structures such as piers.