Fatigue life estimation of 1-D aluminum beam using electromechanical impedance technique

Lim, Yee Yan

doi:10.32657/10356/49513

Cited by 4 publications

(7 citation statements)

References 101 publications

(134 reference statements)

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“…Although both longitudinal and transverse vibrations will be excited in the Smart Probe, transverse motion is dominant in terms of contribution to the electric output of the PZT. 39 Therefore, only transverse vibration of the beam is considered in this study.…”

Section: Emi-based Strength Development Monitoring Of Cementitious Mamentioning

confidence: 99%

A novel electromechanical impedance–based model for strength development monitoring of cementitious materials

Lim

Soh

2017

Structural Health Monitoring

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Strength monitoring of early age concrete improves the efficiency of construction as it provides information on the optimum time for shoring removal and pre-stress transferring. Electromechanical impedance technique has been proven to be a useful tool for strength monitoring of cementitious materials. One of the key limitations of this technique is the lack of physical models, which resulted in strong reliance on statistical analysis tools to quantify the strength of structure being monitored. In this proof-of-concept study, a novel electromechanical impedance–based model with the potential of monitoring the strength of cementitious materials using the concept of Smart Probe is proposed. Instead of directly bonding a lead zirconate titanate patch on the host structure, a lead zirconate titanate was first surface-bonded on a pre-fabricated aluminum beam, which is termed Smart Probe. The Smart Probe was then partially embedded into cementitious materials for strength monitoring. The structural resonant frequencies of the Smart Probe can be identified from the conductance signatures measured from the lead zirconate titanate patch throughout the curing process and serve as strength indicator. By modeling the cementitious material as an elastic foundation supporting the Smart Probe, an analytical model was developed to predict the dynamic modulus of elasticity of cementitious materials based on the resonance frequency of the Smart Probe. Experimental study was carried out on a mortar slab specimen to verify the model and to investigate the performance of the Smart Probe. It was found that the dynamic modulus of elasticity of the host structure could be predicted from the conductance signatures using the proposed model. Compressive strength assessment was achieved by establishing an empirical relation with the dynamic modulus. The proposed electromechanical impedance–based model with Smart Probe is physically parametric in nature and shows high repeatability, which renders its superiority over the conventional statistical method–based electromechanical impedance technique for strength monitoring of cementitious materials.

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Section: Emi-based Strength Development Monitoring Of Cementitious Mamentioning

confidence: 99%

A novel electromechanical impedance–based model for strength development monitoring of cementitious materials

Lim

Soh

2017

Structural Health Monitoring

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“…As proven in previous studies (Lim 2012), the real part of the admittance (conductance) is more sensitive to changes in the structure's mechanical properties than the imaginary part (susceptance). Also, the consistency of the conductance has been shown in the previous section.…”

Section: Miniature Prism Resonance Frequency As Strength Indicatormentioning

confidence: 66%

“…Considering force equilibrium and adopting the "plane sections remain plane" assumption, the forces can be replaced by a pair of axial forces acting along the neutral axis and a pair of couples (Figure 3.2). Although both longitudinal and tranverse vibrations will be excited in the Smart Probe, transverse motion is dominant in terms of contribution to the electric output of the PZT (Lim 2012). Therefore, only transverse vibration of the beam is considered in this study.…”

Section: Dynamic Response Of Smart Probe Subject To Pzt Actuationmentioning

confidence: 99%

“…Note that the axial motion of the aluminium bar can also be modelled and formulated. However, the amplitude of the resonance peaks in the conductance signatures corresponding to the axial motion is considerably smaller than that of the bending motion(Lim 2012). These 'axial' peaks would be largely damped out and unrecognisable when the Smart Probe is embedded to monitor the strength development of cementitious materials.…”

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confidence: 99%

“…Figure 4.4 shows the amplified profile of the Smart Probe and the equivalent forces from the PZT. As the contribution of the flexural motion is predominant in the application of EMI technique(Lim 2012), only the couples are considered. As can be seen in…”

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confidence: 99%

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Application of piezoelectric materials to monitor modulus and strength development of cementitious materials

Lu¹

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Strength development monitoring and dynamic modulus assessment of cementitious materials using EMI-Miniature Prism based technique

Lim

Izadgoshasb

et al. 2019

Structural Health Monitoring

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Electromechanical impedance (EMI) technique provides an alternative means of characterizing strength development of early age concrete on a real-time basis. However, most existing studies employing the technique heavily rely on statistical tools for strength development characterization. This article proposes a new impedance-based approach to strength and dynamic modulus assessment of cementitious materials. In this approach, a lead zirconate titanate patch is surfaced-bonded on a customized cementitious material specimen, known as ‘Miniature Prism’, in which the conductance signatures throughout the curing process are acquired. A 3D coupled field finite element (FE) model is then developed to compute the conductance signatures and model updating is performed using the experimental results. The conductance signatures computed by the updated FE model are found to be in good agreement with experimental results. The key contribution of this approach is the use of ‘Miniature Prism’ which ensures consistency of the resonance peaks in the conductance spectrum between identical specimens. This has been very difficult, if not impossible, to achieve with the conventional EMI technique. This merit allows for modelling of the electromechanical system and hence parametrically predicting the dynamic modulus of elasticity of the cementitious material throughout the curing process. Comparative study is also conducted on various conventional and advanced techniques and results indicate that the proposed technique is effective in strength assessment of cementitious materials. In addition, the technique is suitable for autonomous online monitoring purpose, and thus exhibits promising potential to substitute the conventional non-destructive testing methods.

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Fatigue life estimation of 1-D aluminum beam using electromechanical impedance technique

Abstract: Ageing of structures over the years are creating maintenance problems, ushering the development of automated, real-time and online structural health monitoring (SHM) and nondestructive evaluation (NDE) systems to provide cost-effective WCC Waveform chain code Chapter 1: Introduction 1

Cited by 4 publications

References 101 publications

A novel electromechanical impedance–based model for strength development monitoring of cementitious materials

A novel electromechanical impedance–based model for strength development monitoring of cementitious materials

Application of piezoelectric materials to monitor modulus and strength development of cementitious materials

Strength development monitoring and dynamic modulus assessment of cementitious materials using EMI-Miniature Prism based technique

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