In-situ observation of nonuniform deformation during tensile test of aluminum alloy sheet by means of screen-printed mechanoluminescence film

Kanamaru, Kuniaki; Utsunomiya, Hiroshi

doi:10.1016/j.scriptamat.2021.114388

Cited by 8 publications

(8 citation statements)

References 20 publications

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“…However, the relationship between the ML characteristics and the tracking performance for crack propagation remains unknown. Considering both structural factors, it is presumed that a thick ML film interferes not only with the crack propagation but also with the original characteristics of twill-CFRP, even though it contributes to the creation of a higher ML intensity [ 25 , 39 ]. Thus, paying attention to the mixing ratio between SAOE powder and epoxy resin in the ML sensor, we prepared and evaluated the ML sensor consisting of SAOE powder (SAO) and epoxy resin (Ep) in various weight ratios (SAO/Ep = 40/60, 50/50, 60/40, 70/30, 80/20, 90/10).…”

Section: Resultsmentioning

confidence: 99%

Flexible Mechanoluminescent SrAl2O4:Eu Film with Tracking Performance of CFRP Fracture Phenomena

Fujio

Terasaki

2022

Sensors

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Non-destructive testing of carbon-fiber-reinforced plastic (CFRP) laminates with bidirectional fiber bundles (twill-weave) using a mechanoluminescence (ML) technique was proposed. The dynamic strain distributions and fracture phenomena of the CFRP laminates in the tensile testing were evaluated by the fabricated ML sensor consisting of SrAl2O4:Eu (SAOE) powder and epoxy resin. The ML images for the ML sensor attached to the CFRP laminates with bidirectional fiber bundles gave a net-like ML intensity distribution similar to the original twill weave pattern. Specifically, it was found that the ML intensity on the longitudinal fiber bundle, which is the same as the tensile direction, is higher than that on the transverse fiber bundle. This indicates that the ML sensor can visualize the load share between fiber bundles in different directions of the CFRP laminate with high spatial resolution. Meanwhile, the ML sensor could also visualize the ultrafast discontinuous fracture process of the CFRP laminates and its stress distribution. The amount of SAOE powder in the ML sensor affects the tracking performance of the crack propagation. A higher SAOE amount leads to a fracture of the ML sensor itself, and a lower SAOE amount leads to poor ML characteristics.

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Section: Resultsmentioning

confidence: 99%

Flexible Mechanoluminescent SrAl2O4:Eu Film with Tracking Performance of CFRP Fracture Phenomena

Fujio

Terasaki

2022

Sensors

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“…To overcome such problems and to improve ML image quality, the authors focused on the screen-printing technique using fine ground ML particle and succeeded to obtain ³5 µm thick ML layer in the previous paper. 23) As the result, Lüders band propagation in the test piece was visualized by the ML layer on the A1050 aluminum sheet. 23) As described above, the direct screen-printed ML layer may be suitable for applications to detect small stress change just like Lüders band phenomenon, however, the coating process to the testing object should be performed before every measurement.…”

Section: Introductionmentioning

confidence: 97%

“…23) As the result, Lüders band propagation in the test piece was visualized by the ML layer on the A1050 aluminum sheet. 23) As described above, the direct screen-printed ML layer may be suitable for applications to detect small stress change just like Lüders band phenomenon, however, the coating process to the testing object should be performed before every measurement. To improve flexibility and applicability of the ML measurements, a detachable ML film which was fabricated by printing ³5 µm ML layer onto a one surface of resin base having detachable adhesive layer on the other surface, was studied.…”

Section: Introductionmentioning

confidence: 97%

<i>In Situ</i> Quantitative Measurement of Stress Distribution in Tensile Specimen Using a Detachable Mechanoluminescence Film

2023

Self Cite

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Mechanoluminescence (ML) materials, e.g., SrAl 2 O 4 :Eu 2+ , emit visible light when mechanical stress is applied. It was reported that the intensity of the light is in proportion to the applied von Mises stress. Therefore, acting von Mises stress can be measured from the intensity using a calibration curve. To make the ML measurements easier and more flexible, a detachable ML film has been newly developed. One surface of the base sheet was coated with detachable adhesive, while the other was coated with ³5 µm thick ML layer. Two ML films were taken from one ML sheet so that the two pieces have identical ML properties. One piece was pasted on an A6061 aluminum alloy test piece (JIS13B, t = 1.0 mm) to obtain a calibration curve by the tensile test. The other piece was pasted on another A6061 test piece with a circular opening at the center to reveal the nonuniform stress distribution. The von Miese stress converted from the ML intensity showed a good agreement with the prediction by finite element analysis (FEA). It is concluded that the detachable ML film is sufficiently accurate and practical means to measure stress distribution in the target material.

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“…In recent years, the application of aluminum alloys in automobiles has been continuously promoted [3][4][5][6] with continuous development and advancement in the preparation and processing of aluminum alloy materials. Due to the addition of different alloying elements to aluminum, the resulting aluminum alloys have different properties and microstructures, and different series of aluminum alloys are applied to different parts of the vehicle according to requirements [7][8][9]. Thin-walled material profiles have excellent energy-absorbing properties due to their ability to undergo stable axial deformation; such profiles are often used as safety components in automobiles, such as crash beams, crash boxes, and longitudinal crash beams, and these components are often made of 6xxx-series aluminum alloys [10,11].…”

Section: Introductionmentioning

confidence: 99%

Material Properties and Structure of Al-Mg-Si Alloy Thin-Walled Profiles with Different Alloy Compositions and Aging Processes

Guo,

Li,

Tan

2024

Applied Sciences

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Thin-walled Al-Mg-Si alloy profiles with different compositions and aging states were prepared using the heating and extrusion process. The properties and structure of the profiles were then investigated using a metallographic microscope, scanning electron microscope, projection electron microscope, and universal testing machine. The results show that the yield strength and tensile strength of the profile increases with the increase in total Mg + Si content, and ductility is reduced. If the total Mg + Si content is too high or too low, the crush performance of the material would decrease. Compared with the under-aged and near-peak-aged states, the three types of AI-Mg-Si alloy thin-walled profiles at the over-aged state have better effective energy absorption during crushing and higher bending angle; however, the tensile strength of the profile is optimal at the near-peak-aged state. The effects of alloy composition and aging process on material strength and crushing energy absorption are mainly attributed to the grain structure and differences in precipitation. For coarse grain structures, the grain boundary precipitate free zones are wider, which decreases the profile ductility. Simultaneously, an increase in primary strengthening phases in the grains would increase the profile strength.

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In-situ observation of nonuniform deformation during tensile test of aluminum alloy sheet by means of screen-printed mechanoluminescence film

Cited by 8 publications

References 20 publications

Flexible Mechanoluminescent SrAl2O4:Eu Film with Tracking Performance of CFRP Fracture Phenomena

Flexible Mechanoluminescent SrAl2O4:Eu Film with Tracking Performance of CFRP Fracture Phenomena

<i>In Situ</i> Quantitative Measurement of Stress Distribution in Tensile Specimen Using a Detachable Mechanoluminescence Film

Material Properties and Structure of Al-Mg-Si Alloy Thin-Walled Profiles with Different Alloy Compositions and Aging Processes

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