Fiber Bragg Grating Sensors for Failure Detection of Flip Chip Ball Grid Array in Four-Point Bend Tests

Lu, Hua; Hussain, Raamis; Zhou, Ming; Gu, Xiaodong

doi:10.1109/jsen.2009.2014419

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…And it is seen that there are considerable differences between the strain gauge and FBG sensor. [39] In all of these experiments, [18,19,23,39] the temperature is kept constant, and there is an external load. When there is not any temperature change in the test piece, the cause of the strain is only external load, and sensors only measure the mechanical strain that develops on the test piece.…”

Section: Resultsmentioning

confidence: 99%

Monitoring and verification of micro‐strain generated inside the laminate subjected to thermal loading through fiber bragg grating sensors and classical laminate theory

2023

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Fiber Bragg Grating (FBG) sensors possess enormous potential for the cure monitoring and integrity assessment of Carbon Fiber Reinforced Polymer (CFRP) composites. These sensors can be embedded inside the structure to monitor the strain in the desired region of interest. The strain on an FBG sensor can be calculated by measuring the change in the center wavelength of the sensor. This change in center wavelength is a function of temperature and mechanical strain. Therefore, temperature compensation is necessary for a precise mechanical strain measurement with an FBG sensor. In this study, FBG sensors are embedded in different layers of the CFRP laminate to record the mechanical strain caused by the thermal expansion, which happens under the influence of temperature. Classical laminate theory (CLT) is implemented to assess the accuracy of FBG sensor measurements and the strain data acquired from both FBG sensor and CLT correlates. Furthermore, a resistive strain gauge is deployed to measure the strain under the influence of temperature. It is depicted that strain values recorded by the strain gauge under the influence of the temperature do not agree with the strain measured by CLT, and an error of 150% occurs among their values.

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Section: Resultsmentioning

confidence: 99%

Monitoring and verification of micro‐strain generated inside the laminate subjected to thermal loading through fiber bragg grating sensors and classical laminate theory

2023

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“…FBG has also become very popular because of its high dynamic range, immunity to electromagnetic interference and its multiplexing capability [2]. FBG's as short as 1 to 5 mm length, can be made on fibers of 125 µm in cladding diameter and was used in localized strain measurements recently [3]. However, FBG has a limitation of obtaining less strain reading than the true substrate strain with conventional bonding method due to the limited contact area between the fiber and substrate and due to shear modulus of the epoxy.…”

Section: Author's Decleartionmentioning

confidence: 99%

Fiber Bragg Grating Sensors for the Detection of Metal Crack Initiation by Low Cycle Fatigue Test

Hossain¹

2023

Preprint

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Structural integrity is always an important issue for the service life time of any structure. Therefore, joint of the metal is also a vital point to consider. This thesis describes a new method that uses the Fiber Bragg Grating (FBG) sensor to detect the crack initiation of friction stir welded aluminum (AL) alloy by low cycle fatigue test. Experimental setups and procedures are studied, a proper test configuration is determined and a series of testing performed. The applicability of this new method of stress control fatigue test in monitoring the metal crack initiation is demonstrated through the test results, which shows that FBG sensors are sensitive to capture the onset of the crack. Stress controlled fatigue tests especially at high strain amplitude for Friction Stir Welded (FSW) joints demand the sensors to withstand strain level above ±8000 με [40] and with the size of few mm, and these sensors are not available in the market. In this work, the new sensors arrays are used in the characterization of cyclic deformation behavior of FSW aluminum alloy, which, in some cases, could sustain up to ±11000με. During the experiment significant difference in plastic strain amplitude (PSA) was observed using these optical fiber sensors mounted in nugget zone (NZ) and across the boundary area between thermo mechanical affected zone (TMZ) and heat affected zone (HZ). For all the samples of Al alloy, with the progress of cyclic deformation the cyclic hardening characteristics of the metal were observed.

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“…FBGs were written on a SMF-28 fiber with polyacrylate coating ( 250 μm) by using a phase mask method. A more detailed description of the method can be found in the paper by Lu et al [78]. Once the gratings were written, they were coated with protective polyimide coating ( 160 μm)…”

Section: Specimensmentioning

confidence: 99%

Application Of FBG Sensors For Fatigue Monitoring Of Advanced Polymer Matrix Composites

Selezneva¹

2021

Preprint

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The utilization of polymer matrix composites (PMCs) in the aerospace industry has increased over the last decade due to their high specific strength. The next generation of PMCs has the potential of being used for applications of elevated temperature (ET). Work conducted in this thesis is aimed at developing test methodology for the characterization of fatigue behavior of PMCs at ET. Conventional strain measurement techniques (e.g. strain gages and extensometers) have limited applicability during cyclic loading. An alternative strain sensing technology is the Fiber Bragg Grating (FBG) sensor. In this thesis surface mounted and embedded FBG sensors are used to monitor stiffness degradation and damage development in woven PMCs during fatigue loading at temperatures up to 200°C. Results demonstrate the applicability of FBGs for fatigue monitoring of PMCs in this temperature range. Also, the effect of temperature on the off-axis properties of PMCs is captured and discussed.

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Fiber Bragg Grating Sensors for Failure Detection of Flip Chip Ball Grid Array in Four-Point Bend Tests

Cited by 10 publications

References 5 publications

Monitoring and verification of micro‐strain generated inside the laminate subjected to thermal loading through fiber bragg grating sensors and classical laminate theory

Monitoring and verification of micro‐strain generated inside the laminate subjected to thermal loading through fiber bragg grating sensors and classical laminate theory

Fiber Bragg Grating Sensors for the Detection of Metal Crack Initiation by Low Cycle Fatigue Test

Application Of FBG Sensors For Fatigue Monitoring Of Advanced Polymer Matrix Composites

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