拉伸和剪切载荷下复合板减震孔周围加固的研究

IF 1.5 4区 材料科学 Q4 MATERIALS SCIENCE, COMPOSITES Mechanics of Composite Materials Pub Date : 2024-02-24 DOI:10.1007/s11029-024-10182-6
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引用次数: 0

摘要

可以采用不同的方法来加固穿孔复合板的薄弱结构。采用蔡-吴失效准则和有限元法(FEM)计算,比较了孔周围的四种加固模型(环形、菊花形、方形和椭圆形)在纯拉伸、纯剪切和组合(拉伸和剪切载荷)载荷下的情况。在进行有限元分析之前,使用环氧树脂编织碳纤维预浸料制作的 12 个拉伸试样和 6 个剪切试样进行了拉伸试验。在剪切试验试样的测试过程中,使用数字图像相关(DIC)方法获得了应变分布。利用拉伸试验中确定的外力-变形曲线和 DIC 技术获得的应变分布进行了有限元验证。结果表明,在拉伸和剪切荷载作用下,四种不同的加固模型(所创建的减震孔体积占 38%)比未加固结构的强度至少提高了 30%。在综合荷载下,根据拉伸/剪切荷载比,不同类型的加固结构可提高不同的强度。
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Investigation of Reinforcement Around the Lightening Hole in Composite Plates Under Tension and Shear Loads

Different methods can be applied to strengthen the weakened structure in perforated composite plates. A comparison of the four reinforcement models around the hole (ring, daisy, square and ellipse) under pure tension, pure shear, and combined (both tensile and shear loads) loadings was presented using Tsai-Wu failure criteria and calculations by finite element method (FEM). Before FEM analysis, tensile tests were performed with 12 tensile- and 6 shear-test specimens made of woven carbon fiber epoxy prepreg. During the tests of shear-test specimens, the strain distribution was obtained using the digital image correlation (DIC) method. Finite element verification was performed with both the applied force-deformation curve determined in the tensile test and the strain distribution obtained by the DIC technique. It was observed that four different reinforcement models, which have 38% volume of the created lightening hole, provide at least by 30% strength improvement to the unreinforced structure under tensile and shear loadings. Under combined loadings, according to the tensile/shear load ratio, the reinforcement types provide improvements at different rates.

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来源期刊
Mechanics of Composite Materials
Mechanics of Composite Materials 工程技术-材料科学:复合
CiteScore
2.90
自引率
17.60%
发文量
73
审稿时长
12 months
期刊介绍: Mechanics of Composite Materials is a peer-reviewed international journal that encourages publication of original experimental and theoretical research on the mechanical properties of composite materials and their constituents including, but not limited to: damage, failure, fatigue, and long-term strength; methods of optimum design of materials and structures; prediction of long-term properties and aging problems; nondestructive testing; mechanical aspects of technology; mechanics of nanocomposites; mechanics of biocomposites; composites in aerospace and wind-power engineering; composites in civil engineering and infrastructure and other composites applications.
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