Frequency domain analysis of mechanical properties and failure modes of PVDF at high strain rate. (28th February 2020)

• Record Type: Journal Article
• Authors: Zhao, Yushuai; Zhang, Yingying; Xu, Junhao; Zhang, Mingyue; Yu, Penghao; Zhao, Qichong
• Is Part Of: Construction & building materials. Volume 235(2020)
• Publication Date: 2020-02-28
• Subjects: Structural membrane material -- High strain rate -- Frequency domain -- Failure mode; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.117506
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Ferrari 1002S2 were tested in five strain rates. Mechanical properties were analyzed in frequency domain by using FFT transform. The variation of phase, amplitude and power were analyzed at different frequencies. Typical failure modes and corresponding power spectrum at different strain rates are proposed. Both energy absorption capacity and failure mode have strain rate effect. Abstract: Fast Fourier transform (FFT) theory is used to analyze the tensile stress-strain curves of coated fabric membrane materials (PVDF) at high strain rates (350/s, 500/s, 750/s, 900/s and 950/s). The transformation results are extended to characterize the failure and dynamic response of Ferrari 1002S2 in frequency domain. Firstly, the dynamic mechanical properties of the materials are analyzed, which include stress-strain relationship curve, ultimate tensile strength, fracture elongation and fracture energy density. Then, the stress-time, strain-time and voltage-time signals are converted in frequency domain, and the dynamic mechanical properties of materials are analyzed from the point of view of frequency domain. Finally, according to the power-frequency curve obtained from the voltage-time signal, the corresponding relationship between the failure mode and the frequency domain is proposed. Besides, the typical power-frequency curve corresponding to each failure mode is analyzed by combining with the failure mode of the specimens. The results show that the dynamic mechanical properties of Ferrari 1002S2 materials are analyzed well from the point of view of frequency domain. The failure mode is directly related to the frequency domain distribution.