Stress concentration in the auxetic porous screw and its fatigue behavior

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Composite Structures Pub Date : 2024-07-18 DOI:10.1016/j.compstruct.2024.118403

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Abstract

The auxetic porous bone screw (AS) proposed had favorable immediate stability and osseointegration performance, demonstrating a broad clinical application prospect in our previous study. Quantitatively characterizing the fatigue resistance of AS is significant for long-term stability since it needs to withstand the cyclic musculoskeletal loads. In this study, the effect of stress concentration on the fatigue behavior of AS was quantitatively characterized via stress gradient-based method. The fatigue limit ( ${\hat{σ}}_{f}$ ), fatigue notch factor (K_f), and Haigh’s diagram were obtained. The stress concentration coefficient (K_T) and stress gradient (χ) at notch root of AS were calculated, by which its ${\hat{σ}}_{f}$ could be characterized. When geometric parameters of AS altered, its ${\hat{σ}}_{f}$ could be predicted accurately via the K_T and χ. The ${\hat{σ}}_{f}$ of AS was negatively correlated with K_T but positively correlated with $\sqrt{χ}$ . The fatigue resistance of AS would be improved via reducing its K_T and increasing χ.

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辅助多孔螺杆中的应力集中及其疲劳行为

在我们之前的研究中，提出的辅助多孔骨螺钉（AS）具有良好的即刻稳定性和骨结合性能，显示出广阔的临床应用前景。由于辅助多孔骨螺钉需要承受肌肉骨骼的周期性载荷，因此定量表征其抗疲劳性能对其长期稳定性意义重大。本研究通过基于应力梯度的方法定量分析了应力集中对强直性脊柱炎疲劳行为的影响。研究得出了疲劳极限（σ^f）、疲劳缺口系数（Kf）和海格图。计算了 AS 缺口根部的应力集中系数（KT）和应力梯度（χ），从而确定了其 σ^f 的特征。当 AS 的几何参数发生变化时，可通过 KT 和 χ 准确预测其 σ^f。AS 的 σ^f 与 KT 呈负相关，但与χ 呈正相关。通过降低 KT 和增加 χ 可以提高 AS 的抗疲劳性。

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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.