A strain-rate-dependent analytical model for composite bolted joints

IF 4 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Steel and Composite Structures Pub Date : 2021-01-01 DOI:10.12989/SCS.2021.41.2.279
Alireza Shamaei-Kashani, M. Shokrieh
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引用次数: 1

Abstract

In the present research, a novel analytical approach was developed to predict the bearing chord stiffness and the damage initiation bearing-load of single-lap composite bolted joints under medium strain rate loading. First, the elastic moduli, Poisson's ratio, and strength of a unidirectional composite ply at an arbitrary strain rate were predicted by available micromechanical equations. Then, the bearing chord stiffness of the joint at any arbitrary strain rate was predicted. For this purpose, the available spring-based model was modified. The strain-rate-dependent damage initiation bearing-load of the joint was predicted by using the moduli and the stress concentration factor of a pin-loaded unidirectional ply. Four types of single-lap joints with [-45/0/+45/90]s and [90/-452/+45]s layups with and without carbon nanofibers were tested at the strain rates of 0.0048 s-1, 0.36 s-1, and 0.89 s-1. The results of experiments showed that mechanical properties of single-lap composite bolted joints increased with increasing the strain rate. Also, employing carbon nanofibers has a significant effect on the mechanical properties of the joints. The predicted results in comparison with the conducted experimental data show good agreements.
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复合材料螺栓连接的应变率相关分析模型
本文提出了一种预测中应变率载荷下单搭接复合材料螺栓连接承载弦刚度和损伤起裂的分析方法。首先,利用现有的微力学方程预测了任意应变速率下单向复合材料层的弹性模量、泊松比和强度。然后,对任意应变速率下节点的承载弦刚度进行了预测。为此,对现有的基于弹簧的模型进行了修改。利用引脚加载单向层的模量和应力集中系数,预测了随应变率变化的接头损伤起裂承载。在应变速率分别为0.0048 s-1、0.36 s-1和0.89 s-1的情况下,对4种铺层为[-45/0/+45/90]s和[90/-452/+45]s的单搭接接头进行了测试。试验结果表明,单搭接复合螺栓连接的力学性能随应变速率的增加而提高。此外,纳米碳纤维的加入对接头的力学性能也有显著的影响。将预测结果与实际实验数据进行了比较,结果吻合较好。
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来源期刊
Steel and Composite Structures
Steel and Composite Structures 工程技术-材料科学:复合
CiteScore
8.50
自引率
19.60%
发文量
0
审稿时长
7.5 months
期刊介绍: Steel & Composite Structures, An International Journal, provides and excellent publication channel which reports the up-to-date research developments in the steel structures and steel-concrete composite structures, and FRP plated structures from the international steel community. The research results reported in this journal address all the aspects of theoretical and experimental research, including Buckling/Stability, Fatigue/Fracture, Fire Performance, Connections, Frames/Bridges, Plates/Shells, Composite Structural Components, Hybrid Structures, Fabrication/Maintenance, Design Codes, Dynamics/Vibrations, Nonferrous Metal Structures, Non-metalic plates, Analytical Methods. The Journal specially wishes to bridge the gap between the theoretical developments and practical applications for the benefits of both academic researchers and practicing engineers. In this light, contributions from the practicing engineers are especially welcome.
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