将正常模式节点作为弯曲疲劳试验共振测试设备支撑位置的实验研究

IF 3.1 2区 材料科学 Q2 ENGINEERING, MECHANICAL
Clara Schramm, Dennis Birkner, Sebastian Schneider, Steffen Marx
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引用次数: 0

摘要

大型疲劳试验对于研究大型循环载荷结构(如风力涡轮机塔架)中出现的尺度效应非常重要。然而,这种实验测试的能耗非常高。作为一种高效的替代方法,本文介绍了一种新的共振测试设备,用于循环弯曲载荷下的大型试样。该设备以 4 点弯曲测试的方式工作,其中试样支撑在其第一法向弯曲模式的节点上,理论上不会产生反作用力。两个激振频率接近共振的反向旋转不平衡电机在试样上产生谐波力。为了验证新的测试装置,以钢管为试样进行了试验性疲劳测试。通过在法向模式节点处设置支撑,支撑力大大降低。此外,还研究了不同位置和激励频率下的支撑力行为。总之,共振测试方法与位于正常模式节点的支撑相结合,为大规模疲劳测试提供了一种高效、节能的测试装置。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Experimental investigations on normal mode nodes as support positions of a resonant testing facility for bending fatigue tests

Experimental investigations on normal mode nodes as support positions of a resonant testing facility for bending fatigue tests

Large-scale fatigue testing is very important to the research on scale effects, which occur in large cyclic loaded structures, such as wind turbine towers. However, such experimental testing has a very high energy consumption. As an efficient alternative, this paper presents a new resonant testing facility for large-scale specimens under cyclic bending loads. The facility works as a 4-point bending test, in which the specimen is supported in the nodes of its first normal bending mode, where theoretically no reaction forces occur. Two counter-rotating imbalance motors with excitation frequencies near resonance generate a harmonic force acting on the specimen. Experimental trial fatigue tests on a steel pipe as a specimen were carried out, in order to validate the new testing setup. A great decrease in the support forces was reached by placing the supports at the normal mode nodes. Additionally, the behavior of the support forces under varying positions and excitation frequencies was also investigated. In summary, the resonant testing method combined with the supports at the normal mode nodes offers an efficient and energy-saving testing setup for large-scale fatigue tests.

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来源期刊
CiteScore
6.30
自引率
18.90%
发文量
256
审稿时长
4 months
期刊介绍: Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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