近场动力学在层合复合材料强度及损伤问题中的研究进展

RESEARCH PROGRESS OF PERIDYNAMICS IN STRENGTH AND DAMAGE PROBLEMS OF LAMINATED COMPOSITES

  • 摘要: 纤维增强层合复合材料的失效行为通常伴随着复杂的损伤机制和特征表现。深入探究此类复合材料的强度特性及其损伤演化对于确保工程结构的使用寿命、优化研发成本以及推动工业产品轻量化设计与剩余强度评估具有至关重要的意义。针对复合材料各向异性的处理问题,在当前近场动力学(Peridynamics, PD)框架内,主要存在两种典型策略:其一,基于碳纤维束与树脂基体等构成材料的物理性质差异,构建具有不同刚度特性的键对模型;其二,将复合材料的各向异性特性融入弹性矩阵中,进而推导出应力-应变本构关系。然而,现有模型大多聚焦于复合材料在初始加载阶段的线性弹性响应,而对于损伤发展阶段所展现的剪切非线性行为、刚度退化现象以及大变形特性等关键力学特征的探讨尚显不足。此外,当前近场动力学研究主要集中于复合材料的拉伸与压缩特性,而对于其在面外载荷作用下的弯曲、扭转以及拉压-弯扭耦合行为的分析则相对匮乏。鉴于此,本文首先概述了复合材料的连续损伤力学基础,旨在为相关领域的研究者提供必要的背景知识与理论基础。随后,系统综述了适用于复合材料的近场动力学模型,总结了当前研究的进展状况与理论特点。最后,本文探讨了近场动力学在实际工程应用中所面临的技术挑战,并对未来的研究方向提出了展望,以期为促进复合材料失效机制的深入理解与工程应用提供有益的参考。

     

    Abstract: The failure behavior of fiber-reinforced laminated composites is often accompanied by complex damage mechanisms and by characteristic manifestations. An in-depth exploration of the strength properties and of damage evolution of such composites is of paramount importance for ensuring the service life of engineering structures, for optimizing research and development costs, and for advancing lightweight design and residual strength assessment of industrial products. Addressing the anisotropy of composites within the current framework of Peridynamics (PD) primarily involves two typical strategies: firstly, constructing bond pair models with different stiffness characteristics based on the physical property differences between constituent materials such as carbon fiber bundles and resin matrices; secondly, incorporating the anisotropic properties of composites into the elastic matrix to derive stress-strain constitutive relationships. However, most existing models focus on the linear elastic response of composites during the initial loading stage, while the exploration of key mechanical features remains insufficient, i.e., the insufficient exploration of shear nonlinearity, of stiffness degradation, and of large deformation characteristics exhibited during the damage progression stage. Furthermore, current research in PD primarily concentrates on the tensile and compressive properties of composites, with a relative lack of analysis on their bending, torsion, and tension-compression-bending-torsion coupling behaviors under out-of-plane loads. In light of this, this study first provides an overview of the fundamentals of continuous damage mechanics for composites, aiming to offer essential background knowledge and theoretical foundations for researchers in related fields. Subsequently, it systematically reviews the PD models applicable to composites, summarizing the current research progress and theoretical characteristics. Finally, discussed is the technical challenges faced by PD in practical engineering applications and, presented is the prospects for future research directions, with the intention of providing valuable insights for enhancing the understanding and engineering application of composite failure mechanisms.

     

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