Instant Dynamic Response Measurements for Crack Monitoring in Metallic Beams

Zai, Behzad Ahmed; Khan, Muhammad Ahmed; Mansoor, Asif; Khan, Sohaib Z.; Khan, Kamran A.

doi:10.1784/insi.2019.61.4.222

Cited by 12 publications

(12 citation statements)

References 16 publications

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“…Consequently, this change in stiffness will affect the overall dynamic response of the structure under an external load. This formulation was also presented in our recently published papers [42][43]. A cantilever beam is selected and the crack is modeled as a massless torsional spring as shown in Figure 4.…”

Section: Analytical Formulation Under Thermo-mechanical Loadsmentioning

confidence: 99%

A novel approach for damage quantification using the dynamic response of a metallic beam under thermo-mechanical loads

Zai

Khan

et al. 2020

Journal of Sound and Vibration

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This paper investigates the interdependencies of crack depth and crack location on the dynamic response of a cantilever beam under thermo-mechanical loads. Temperature can influence the stiffness of the structure, thus, the change in stiffness can lead to variation in frequency, damping and amplitude response. These variations are used as key parameters to quantify damage of Aluminum 2024 specimen under thermo-mechanical loads. Experiments are performed on cantilever beams at non-heating (room temperature) and elevated temperature, i.e., 50°C, 100°C, 150°C and 200°C. This study considers a cantilever beam having various initially seeded crack depth and locations. The analytical, numerical and experimental results for all configurations are found in good agreement. Dynamic response formulation is presented experimentally on beam for the first time under thermo-mechanical loads. Using available experimental data, a novel tool is formulated for in-situ damage assessment in the metallic structures. This tool can quantify and locate damage using the dynamic response and temperature including the diagnosis of subsurface cracking. The obtained results demonstrate the possibility to diagnose the crack growth at any instant within the operational condition under thermo-mechanical loads.

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Section: Analytical Formulation Under Thermo-mechanical Loadsmentioning

confidence: 99%

A novel approach for damage quantification using the dynamic response of a metallic beam under thermo-mechanical loads

Zai

Khan

et al. 2020

Journal of Sound and Vibration

Self Cite

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“…The "stress-crazing" led to a discrepancy in the amplitude behavior. The empirical correlation based on the amplitude has been found difficult to be established for polymers, unlike metals [34].…”

Section: Dynamic Responsementioning

confidence: 99%

In-Situ Dynamic Response Measurement for Damage Quantification of 3D Printed ABS Cantilever Beam under Thermomechanical Load

Baqasah

Zai

et al. 2019

Polymers

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Acrylonitrile butadiene styrene (ABS) offers good mechanical properties and is effective in use to make polymeric structures for industrial applications. It is one of the most common raw material used for printing structures with fused deposition modeling (FDM). However, most of its properties and behavior are known under quasi-static loading conditions. These are suitable to design ABS structures for applications that are operated under static or dead loads. Still, comprehensive research is required to determine the properties and behavior of ABS structures under dynamic loads, especially in the presence of temperature more than the ambient. The presented research was an effort mainly to provide any evidence about the structural behavior and damage resistance of ABS material if operated under dynamic load conditions coupled with relatively high-temperature values. A non-prismatic fixed-free cantilever ABS beam was used in this study. The beam specimens were manufactured with a 3D printer based on FDM. A total of 190 specimens were tested with a combination of different temperatures, initial seeded damage or crack, and crack location values. The structural dynamic response, crack propagation, crack depth quantification, and their changes due to applied temperature were investigated by using analytical, numerical, and experimental approaches. In experiments, a combination of the modal exciter and heat mats was used to apply the dynamic loads on the beam structure with different temperature values. The response measurement and crack propagation behavior were monitored with the instrumentation, including a 200× microscope, accelerometer, and a laser vibrometer. The obtained findings could be used as an in-situ damage assessment tool to predict crack depth in an ABS beam as a function of dynamic response and applied temperature.

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“…A defect in structure is indispensable as it could occur at the manufacturing stage or during service life through dynamic loading, ageing, environmental effects, and corrosion activities [ 38 , 39 ]. All these factors affect the strength of structure through variation in its flexural rigidity or mass that manifests in vibrational frequency [ 18 , 40 , 41 , 42 , 43 ] of the structure as in Equation (1).

where

is the linear natural frequency,

is modal constant,

is the beam length,

is the flexural rigidity of the beam while

is the mass.…”

Section: Ultrasonic Guided Wave Ugwmentioning

confidence: 99%

Review of Current Guided Wave Ultrasonic Testing (GWUT) Limitations and Future Directions

Olisa

Khan

Starr

2021

Sensors

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Damage is an inevitable occurrence in metallic structures and when unchecked could result in a catastrophic breakdown of structural assets. Non-destructive evaluation (NDE) is adopted in industries for assessment and health inspection of structural assets. Prominent among the NDE techniques is guided wave ultrasonic testing (GWUT). This method is cost-effective and possesses an enormous capability for long-range inspection of corroded structures, detection of sundries of crack and other metallic damage structures at low frequency and energy attenuation. However, the parametric features of the GWUT are affected by structural and environmental operating conditions and result in masking damage signal. Most studies focused on identifying individual damage under varying conditions while combined damage phenomena can coexist in structure and hasten its deterioration. Hence, it is an impending task to study the effect of combined damage on a structure under varying conditions and correlate it with GWUT parametric features. In this respect, this work reviewed the literature on UGWs, damage inspection, severity, temperature influence on the guided wave and parametric characteristics of the inspecting wave. The review is limited to the piezoelectric transduction unit. It was keenly observed that no significant work had been done to correlate the parametric feature of GWUT with combined damage effect under varying conditions. It is therefore proposed to investigate this impending task.

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Instant Dynamic Response Measurements for Crack Monitoring in Metallic Beams

Cited by 12 publications

References 16 publications

A novel approach for damage quantification using the dynamic response of a metallic beam under thermo-mechanical loads

A novel approach for damage quantification using the dynamic response of a metallic beam under thermo-mechanical loads

In-Situ Dynamic Response Measurement for Damage Quantification of 3D Printed ABS Cantilever Beam under Thermomechanical Load

Review of Current Guided Wave Ultrasonic Testing (GWUT) Limitations and Future Directions

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