测定高频模式下基体激发聚合物试样力学性能的实验方法

IF 1.9 Q3 ENGINEERING, MECHANICAL Vibration Pub Date : 2022-07-16 DOI:10.3390/vibration5030024
M. Kucher, M. Dannemann, R. Böhm, N. Modler
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引用次数: 2

摘要

由热塑性聚合物聚醚醚酮(PEEK)制成的结构由于其耐高温和高机械性能而被广泛用于动态负载应用。为了设计这些动态应用,除了众所周知的刚度和强度特性外,还需要在给定频率下的减振特性。根据应用,从几赫兹到超声波范围的频率在这里是感兴趣的。为了表征频率相关行为,选择了一种实验方法并将其应用于聚合物PEEK样品。测试装置包括聚合物样品的压电驱动基础激励以及速度和表面温度的非接触测量。利用Timoshenko理论分析了梁的弯曲振动,以确定聚合物的储能模量。机械损耗系数采用半功率带宽法计算。对于PEEK,考虑的频率范围为1 kHz至16 kHz,确定了3.9 GPa至4.2 GPa之间的储能模量和9×10−3至17×10−3。对于所使用的实验参数,所产生的机械性能基本上不受激振幅度、激振持续时间或自热引起的热降解的影响,而是略微受固定区域内的夹紧力的影响。
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An Experimental Approach for the Determination of the Mechanical Properties of Base-Excited Polymeric Specimens at Higher Frequency Modes
Structures made of the thermoplastic polymer polyether ether ketone (PEEK) are widely used in dynamically-loaded applications due to their high-temperature resistance and high mechanical properties. To design these dynamic applications, in addition to the well-known stiffness and strength properties the vibration-damping properties at the given frequencies are required. Depending on the application, frequencies from a few hertz to the ultrasonic range are of interest here. To characterize the frequency-dependent behavior, an experimental approach was chosen and applied to a sample polymer PEEK. The test setup consists of a piezoelectrically driven base excitation of the polymeric specimen and the non-contact measurement of the velocity as well as the surface temperature. The beam’s bending vibrations were analyzed by means of the Timoshenko theory to determine the polymer’s storage modulus. The mechanical loss factor was calculated using the half-power bandwidth method. For PEEK and a considered frequency range of 1 kHz to 16 kHz, a storage modulus between 3.9 GPa and 4.2 GPa and a loss factor between 9 × 10−3 and 17 × 10−3 were determined. For the used experimental parameters, the resulting mechanical properties were not essentially influenced by the amplitude of excitation, the duration of excitation, or thermal degrad.ation due to self-heating, but rather slightly by the clamping force within the fixation area.
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来源期刊
CiteScore
3.20
自引率
0.00%
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0
审稿时长
10 weeks
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