Optimization of preloading process combining elastic interaction and creep relaxation for multi-constraint composite structures

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2025-03-23 DOI:10.1016/j.compstruct.2025.119130

Chang Gao, Yujin Lin, Chenxuan Hu, Haidong Yu

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引用次数: 0

Abstract

The preloading process of composite structure constrained by multiple bolted joints is difficult to be controlled because the elastic interaction between bolts and the creep relaxation of multi-layer viscoelastic structures exist simultaneously. In this paper, an optimization method of preload for multi-constraint composite structure is proposed by combining elastic interaction and long-term load relaxation. The composite structure is equivalent to the viscoelastic multi-layer structure and the load caused by creep relaxation for the multiple bolts is derived based on the viscoelastic constitutive model. The elastic interaction of bolts in relaxation process is considered and the interactive stiffness of multiple bolts is constructed. The iterative algorithm for the preload coupled with creep relaxation and elastic interaction is established. The attenuation behavior of the preload with different initial preloads and sequences for multi-constraint composite structure can be predicted. A data-driven surrogate model for the prediction of preload evolution is established, by which the variation of preload with different preloading processes can be calculated rapidly. Then, the magnitude and uniformity of preload are taken as the optimized objective and the optimal initial preloading parameters are solved, which is useful for the manufacturing of multi-constraint composite structures with long-term storage.

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.