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Experimental and numerical studies on vibration of laminated composite beam with transverse multiple cracks

机译：横向多层裂纹复合材料层合梁的振动试验与数值研究

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摘要

Composite beams are increasingly used in aerospace, automobile, and other applications. Crack is the most common defect in structures during its service life. The cracked composite beams are subjected to dynamic loads and the vibration of the cracked beams is of technical significance to the structural integrity of systems. The objective of the present investigation is to demonstrate the vibration characteristics of a laminated composite beam (LCB) with multiple transverse cracks. Finite element method (FEM) is used for the frequency-based crack analysis in this study. A computer program is developed in MATLAB environment for numerical analysis. First-order shear deformation theory (FSDT) is adopted for the finite element analysis. Natural frequencies of vibration are computed through the eigenvalue solver. Composite specimens are fabricated using hand lay-up technique and are tested for its material constants under tensile test. Experiments are conducted using woven roving Glass/Epoxy laminated beam samples with pre-defined cracks. The obtained test results from the experimental work using FFT analyzer are validated with the numerical results obtained through MATLAB. The effects of natural frequencies with respect to the various boundary conditions, crack depth and locations are investigated to support in real applications. A fine agreement is accomplished between the numerical and test results. Both the studies showed that natural frequencies in the LCB are significantly influenced by the location and size of the cracks. The results show that natural frequencies are decreased with cracks and an increase in fiber orientation.
机译：复合梁越来越多地用于航空航天，汽车和其他应用。裂纹是结构使用寿命中最常见的缺陷。破裂的复合梁承受动态载荷，破裂的振动对于系统的结构完整性具有重要的技术意义。本研究的目的是证明具有多个横向裂纹的层状复合梁（LCB）的振动特性。有限元方法（FEM）用于基于频率的裂纹分析。在MATLAB环境中开发了一个用于数值分析的计算机程序。一阶剪切变形理论（FSDT）用于有限元分析。振动的固有频率通过特征值求解器进行计算。复合样品是使用手工铺层技术制造的，并在拉伸试验下测试了其材料常数。实验是使用具有预定裂缝的编织粗纱玻璃/环氧树脂层压梁样品进行的。使用FFT分析仪从实验工作中获得的测试结果已通过MATLAB的数值结果进行了验证。研究了固有频率对各种边界条件，裂纹深度和位置的影响，以支持实际应用。在数值结果和测试结果之间达成了很好的协议。两项研究均表明，LCB中的固有频率受裂纹位置和大小的影响很大。结果表明，固有频率随着裂纹的增加和纤维取向的增加而降低。

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