Failure behavior and damage model of composite sandwich panels under three-point bending fatigue load

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2024-10-11 DOI:10.1016/j.tws.2024.112570

Fan Dong , Yazhi Li , Xin Qi , Weijie Ma , Chunping Zhou , Biao Li

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引用次数: 0

Abstract

Composite sandwich panels present a variety of damage modes due to their diverse components and variable structural parameters. This work conducted three-point bending static and fatigue tests on composite sandwich panels using specially designed fixtures to investigate their bending-shear characteristics and failure behaviors. The effects of core orientations, i.e., L-direction and W-direction, on the static strength, fatigue life, and fatigue crack initiation and propagation were compared. A stiffness-degradation-based fatigue damage model was constructed for the sandwich panels to describe the entire failure process from core cracking to core/plates debonding, achieving accurate modeling under the full load ratios. A differential evolution algorithm incorporating a penalty function was employed to optimize the model parameters under varying stresses. It was found that the designed fixture enables bi-directional fatigue loading and effectively avoids additional axial forces. Fatigue damage in sandwich panels resembles static but spans a wider area. While damage modes are similar in W-direction and L-direction, L-direction cores have higher stiffness and strength, and lower fatigue resistance in W-direction. Furthermore, the proposed fatigue damage model demonstrates excellent agreement with experimental results, achieving R² = 0.968.

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复合材料夹芯板在三点弯曲疲劳载荷下的失效行为和损伤模型

复合材料夹层板由于其成分和结构参数的多样性而呈现出多种破坏模式。这项研究利用专门设计的夹具对复合材料夹芯板进行了三点弯曲静态和疲劳试验，以研究其弯曲剪切特性和破坏行为。比较了芯材方向（即 L 方向和 W 方向）对静态强度、疲劳寿命以及疲劳裂纹萌发和扩展的影响。为夹芯板构建了基于刚度降解的疲劳损伤模型，以描述从夹芯开裂到夹芯/夹板脱粘的整个失效过程，实现了全载荷比下的精确建模。采用了一种包含惩罚函数的微分进化算法，以优化不同应力下的模型参数。研究发现，所设计的夹具可实现双向疲劳加载，并有效避免了额外的轴向力。夹芯板的疲劳损伤类似于静态损伤，但范围更广。虽然 W 方向和 L 方向的损伤模式相似，但 L 方向的夹芯具有更高的刚度和强度，而 W 方向的抗疲劳性能较低。此外，所提出的疲劳损伤模型与实验结果非常吻合，R2 = 0.968。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.