Localized Cyclic Strain Measurements of Friction Stir Welded Aluminum Alloy Using a Flat-Clad Optical Fiber Sensor Array

Li, C.; Feng, A.H.; Gu, Xiaodong; Chen, D.L.

doi:10.1109/jsen.2009.2036937

Cited by 9 publications

(13 citation statements)

References 14 publications

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“…The possible explanation behind this would be that the formation of residual twins became more saturated in the later cycles. As mentioned above, twinning occurred in compression and partial detwinning occurred in tension [6], [9]- [11], [14], [15], [18], [19]. Twinning and detwinning at the crack tip of pure aluminum have been observed as well during tensile straining under a transmission electron microscope [17].…”

Section: A Stress-strain Hysteresis Loops Of Az31 Extruded Magnesiummentioning

confidence: 72%

“…When bonded on a substrate, the flat-cladding optical fiber provides an appreciably larger contract area than that of a circular cladding fiber. The array was bonded on the back of a dog-bone shaped magnesium sample with a uniform thin layer of epoxy (353ND, EPO-TEK) as reported in our recent studies [8], [9]. The large contact area between flat-cladding fiber and flat substrate in conjunction with the application of a new bonding process has significantly increased the bonding strength.…”

Section: Methodsmentioning

confidence: 99%

“…Recently we reported newly developed flat-cladding optical fiber Bragg grating sensors for the measurement of large strain amplitudes of up to in LCF tests [8]. The sensors were successfully applied to the characterization of localized cyclic strain variations in a friction stir welded aluminum alloy [9].…”

Section: Introductionmentioning

confidence: 99%

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Application of Flat-Clad Optical Fiber Bragg Grating Sensor in Characterization of Asymmetric Fatigue Deformation of Extruded Magnesium Alloy

Feng

et al. 2011

IEEE Sensors J.

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We report the application of a novel flat-cladding optical fiber Bragg grating sensor array in the characterization of low cycle fatigue deformation behavior of an extruded AZ31 magnesium alloy. The results obtained from optical fiber sensors showed strong asymmetry of stress-strain hysteresis loops, especially at high strain amplitudes, due to the occurrence of twinning in compression and detwinning in tension. At a given total strain amplitude, the degree of asymmetry of the hysteresis loops decreased with increasing number of cycles. The alloy also exhibited strong cyclic hardening at higher total strain amplitudes. All of these observations were in good agreement with those measured from an extensometer, and with those reported in the literature. In particular, the plastic strain amplitudes evaluated from optical fiber sensors demonstrated a nearly perfect agreement with those obtained from the extensometer, further corroborating the suitable use of the optical fiber sensors as an important tool in the evaluation of cyclic defromation behavior of materials.Index Terms-Cyclic deformation, flat-clad optical fiber Bragg grating sensor, hysteresis loop, low cycle fatigue, magnesium alloy, twinning and detwinning.

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Section: A Stress-strain Hysteresis Loops Of Az31 Extruded Magnesiummentioning

confidence: 72%

Section: Methodsmentioning

confidence: 99%

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Application of Flat-Clad Optical Fiber Bragg Grating Sensor in Characterization of Asymmetric Fatigue Deformation of Extruded Magnesium Alloy

Feng

et al. 2011

IEEE Sensors J.

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“…Furthermore, due to its small size, the FBG sensor could be used to measure the localized strain variations, for example, in the welding joints, detect fatigue crack initiation, and determine crack closure effect during fatigue crack propagation. We reported recently an application of this sensor to measure the localized strain variation in a friction-stir-welded sample [ 7 ]. Nevertheless, the development of the sensor including high strain amplitude tests and bonding process was not reported.…”

Section: Discussionmentioning

confidence: 99%

Flat-Cladding Fiber Bragg Grating Sensors for Large Strain Amplitude Fatigue Tests

Feng

Chen

et al. 2010

Sensors

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We have successfully developed a flat-cladding fiber Bragg grating sensor for large cyclic strain amplitude tests of up to ±8,000 με. The increased contact area between the flat-cladding fiber and substrate, together with the application of a new bonding process, has significantly increased the bonding strength. In the push-pull fatigue tests of an aluminum alloy, the plastic strain amplitudes measured by three optical fiber sensors differ only by 0.43% at a cyclic strain amplitude of ±7,000 με and 1.9% at a cyclic strain amplitude of ±8,000 με. We also applied the sensor on an extruded magnesium alloy for evaluating the peculiar asymmetric hysteresis loops. The results obtained were in good agreement with those measured from the extensometer, a further validation of the sensor.

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“…Optical fiber-based sensor applications has grown rapidly and can be used to measure different variables, such as the measurement of the electric field, an electric current, cracking, load measurement, temperature, displacement, strain, pressure and so forth. Several studies have reported that optical fiber can be used for measurement of the electric current using the optical fiber-based curvature sensors [2], the sensor of a pre-stressed concrete viaduct for structural healt monitoring (SHM) [3], the application for the temperature sensor with power losses curvature [4], the application of optical fibers for displacement sensor [5,6], for a strain sensor [7] and the application of optical fibers as a pressure sensor [8]. Further research will focus on the measurement of weight using microbending methods on the optical fiber-based sensors and OTDR [9].…”

Section: Introductionmentioning

confidence: 99%

Comparison of sensitivity and resolution load sensor at various configuration polymer optical fiber

Arifin¹,

Yusran²,

Miftahuddin³

et al. 2017

AIP Conference Proceedings

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This study uses a load sensor with a macro-bending on polymer optical fiber loop model which is placed between two plates with a buffer spring. The load sensor with light intensity modulation principle is an infrared LED emits light through the polymer optical fiber then received by the phototransistor and amplifier. Output voltage from the amplifier continued to arduino sequence and displayed on the computer. Load augment on the sensor resulted in an increase of curvature on polymer optical fibers that can cause power losses gets bigger too. This matter will result in the intensity of light that received by phototransistor getting smaller, so that the output voltage that ligable on computer will be getting smaller too. The sensitivity and resolution load sensors analyzed based on configuration with various amount of loops, imperfection on the jacket, and imperfection at the cladding and core of polymer optical fiber. The results showed that the augment on the amount of load, imperfection on the jacket and imperfection on the sheath and core polymer optical fiber can improve the sensitivity and resolution of the load sensor. The best sensors resolution obtained on the number of loops 4 with imperfection 8 on the core and cladding polymer optical fiber that is 0.037 V/N and 0,026 N. The advantages of the load sensor based on polymers optical fiber are easy to make, low cost and simple to use measurement methods.

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Localized Cyclic Strain Measurements of Friction Stir Welded Aluminum Alloy Using a Flat-Clad Optical Fiber Sensor Array

Cited by 9 publications

References 14 publications

Application of Flat-Clad Optical Fiber Bragg Grating Sensor in Characterization of Asymmetric Fatigue Deformation of Extruded Magnesium Alloy

Application of Flat-Clad Optical Fiber Bragg Grating Sensor in Characterization of Asymmetric Fatigue Deformation of Extruded Magnesium Alloy

Flat-Cladding Fiber Bragg Grating Sensors for Large Strain Amplitude Fatigue Tests

Comparison of sensitivity and resolution load sensor at various configuration polymer optical fiber

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