带柔性多孔芯材的三明治梁在移动质量作用下的动态响应

IF 1.5 4区 材料科学 Q4 MATERIALS SCIENCE, COMPOSITES Mechanics of Composite Materials Pub Date : 2024-03-04 DOI:10.1007/s11029-024-10181-7
H. Biglari, H. Teymouri, A. Shokouhi
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引用次数: 0

摘要

采用准三维剪切变形理论研究了夹层梁的动态行为,该夹层梁具有多孔核心和碳纳米管增强聚合物面层,在简单支撑物上受到移动质量的作用。方程组是利用能量技术确定的。为了求解运动方程,采用了空间域的纳维分析法和时域的纽马克数值法。此外,还对梁自由振动的自然频率进行了研究和评估。为了验证所获结果的准确性,与文献中报道的特定情况下的现有响应进行了比较。研究了各种参数(如碳纳米管体积百分比、多孔系数和分布模式、几何和尺寸参数比、运动质量速度、面片与芯材厚度比)对多孔芯材和纳米复合材料表面夹层梁的动态响应、运动质量临界速度和固有频率的影响。结果表明,随着夹芯孔隙率的增加,固有频率和临界速度也随之增加。由于夹芯结构中的固有孔变大,梁的刚度和质量也随之降低。然而,质量减小的影响大于刚度减小的影响,因此系统的频率和临界速度都得到了提高。
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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Dynamic Response of Sandwich Beam with Flexible Porous Core Under Moving Mass

The dynamic behavior of a sandwich beam with a porous core and carbon nanotube-reinforced polymer facesheets subjected to a moving mass on simple supports was investigated using the quasi-3D theory of shear deformation. The system of equations was determined using the energy technique. In order to solve the equations of motion, the analytical Navier’s approach in the space domain and the numerical Newmark’s method in the time domain were employed. Additionally, the natural frequencies of the free vibrations of beam were studied and evaluated. To validate the accuracy of the results obtained, comparisons were made with existing responses for specific circumstances reported in the literature. The effect of various parameters such as carbon nanotube volume percentage, porosity coefficient and distribution pattern, ratio of geometric and dimensional parameters, speed of moving mass, and facesheet-to-core thickness ratio on the dynamic response, critical speed of moving mass, and natural frequency of the sandwich beam with a porous core and nanocomposite surfaces were investigated. The results showed that by increasing the core porosity, the natural frequencies and critical speeds were increased. Because the intrinsic holes in the core structure get bigger, the stiffness and mass of the beam decrease. However, the effect of the mass reduction is greater than the effect of the stiffness reduction, so the frequency and critical speed of the system are increased.

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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.
期刊最新文献
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