复合材料夹层螺栓连接中构件刚度的数值研究

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
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引用次数: 0

摘要

对于同质和各向同性材料,螺栓连接中的构件刚度已被广泛研究,而复合夹层材料则不同。因此,我们在 ANSYS 软件中进行了基于增量拉格朗日算法的数值模拟,以解决接触问题,研究了带有碳和玻璃层压板表皮以及两种泡沫芯材的各种预载夹层螺栓连接。测试样品显示,当施加的预紧力大幅增加时,最大剪应力与最大主应力之比上升,从而增加了夹芯失效的风险、采用搜索算法推导出测试连接部件的等效弹性模量表达式,并采用距离相关法确定所引入刚度模型的理论表述,通过分析其数学近似值的均方根误差(RMSE)结果,优化了该模型的准确性,确保了所选模型对所有测试样品的收敛性,但具有最大弹性模量(209 GPa)的最坚硬表皮样品除外。此外,Zhang 和 Poirier 引入的关于导致螺栓连接分离的拉伸载荷方程也得到了调整和验证,误差小于 13%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Investigation of Member Stiffness in Composite Sandwich Bolted Connections

Member stiffness in bolted connections has been widely studied for homogenous and isotropic materials contrary to composite sandwich ones. Therefore, a numerical simulation based on the augmented Lagrangian algorithm to solve contacts problems is conducted in ANSYS software to investigate various preloaded sandwich bolted joints with carbon and glass laminate skins and two types of foam cores. Tested samples show a rise of the ratio of maximum shear stress to maximum principal stress when the applied preload increases considerably which improves the risk of core failure, additionally, an analytical approximation of stiffness at preload is proposed, for that, a search algorithm is used to deduce the expression of the equivalent elastic modulus of tested joint members and a distance correlation method is applied to determine the theoretical formulation of the introduced stiffness model whose accuracy is optimized through analyzing results of root mean square error (RMSE) of its mathematical approximations , the convergence of the chosen model is ensured for all tested samples except the ones having the most rigid skins with the greatest elastic modulus (209 GPa). Furthermore, the equation introduced by Zhang and Poirier concerning the tension load causing a bolted joint separation is adapted and validated with a percent error less than 13%.

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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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