Improved Numerical Modelling of Fiber Reinforced Plastics I-Beam from Experimental Modal Testing and Finite Element Model Updating

IF 0.8 4区工程技术 Q4 ACOUSTICS

International Journal of Acoustics and Vibration Pub Date : 2018-01-01 DOI:10.20855/IJAV.2018.23.11069

A. Mishra, Althaf Mohammed, S. Chakraborty

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引用次数: 7

Abstract

Fiber reinforced plastics (FRP) is increasingly being used in infrastructural applications like bridges, chemical plants etc., where the environment can limit the expected service life of structures made of conventional materials such as reinforced concrete, steel or timber. Advantages of FRP over conventional constructional materials are its high specific strength and specific stiffness, ease with which it can be moulded to various shapes, corrosion resistance, lower lifecycle cost, durability etc. Estimation of accurate dynamic responses of FRP structures is very important from their operation point of view. Such dynamic responses are functions of material properties, boundary conditions, geometry and applied loading. FRP being an anisotropic and layered composite material, a large number of elastic material property parameters are to be determined. Moreover, its structural fabrication and material fabrication at constituent level being one unified process, the actual existing material property parameters may vary considerably from those specified in established standards or determined from characterisation tests. The present approach attempts at establishing a nondestructive technique based on experimental modal testing and finite element model updating to estimate the elastic material parameters of an ‘I’ beam made of FRP, thereby making the prediction of dynamic responses more accurate. Static load test on the beam and characterisation tests on samples cut from actual structure are conducted to assess the performance of this updating exercise. The current approach can also be used to nondestructively monitor degradations of elastic material properties over time and thus can be used for health monitoring of existing FRP structures.

查看原文本刊更多论文

基于试验模态试验和有限元模型修正的纤维增强塑料工字梁数值模拟方法的改进

纤维增强塑料(FRP)越来越多地用于基础设施应用，如桥梁、化工厂等，在这些应用中，环境会限制由钢筋混凝土、钢或木材等传统材料制成的结构的预期使用寿命。玻璃钢优于传统建筑材料的优点是其高比强度和比刚度，易于模塑成各种形状，耐腐蚀，较低的生命周期成本，耐久性等。从FRP结构的运行角度来看，准确估计FRP结构的动力响应是非常重要的。这种动态响应是材料特性、边界条件、几何形状和施加载荷的函数。FRP作为一种各向异性层状复合材料，需要确定大量的弹性材料性能参数。此外，其结构制造和材料制造在组成层面是一个统一的过程，实际存在的材料性能参数可能与既定标准中规定的或从特性测试中确定的参数有很大差异。本方法试图建立一种基于试验模态测试和有限元模型更新的无损技术来估计FRP制成的“I”型梁的弹性材料参数，从而使动态响应的预测更加准确。对梁进行静载试验，并对从实际结构上切割下来的样品进行特性试验，以评估这次更新工作的性能。目前的方法还可用于无损监测弹性材料性能随时间的退化，从而可用于现有FRP结构的健康监测。

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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来源期刊

International Journal of Acoustics and Vibration ACOUSTICS-ENGINEERING, MECHANICAL

CiteScore

1.60

自引率

10.00%

发文量

审稿时长

12 months

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