Failure life estimation of sharp-notched circular tubes with different notch depths under cyclic bending

Lee, Kuo Long; Chang, Kuo-Hao; Pan, Wen Chi

doi:10.12989/sem.2016.60.3.387

Cited by 8 publications

(7 citation statements)

References 33 publications

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“…Moreover, a larger hole diameter led to a more asymmetrical appearance of the ΔDo/Do- relationship. The ΔDo/Do- relationships revealed an asymmetrical bow shape, which was different from that of the sharp-notched SUS304 stainless steel tubes tested by Lee et al [2] and Lee [3] , and that of the sharp-notched 6061-T6 aluminum alloy tubes tested by Lee et al [5] and Lee et al [6] . In addition, ΔDo/Do continued to increase when the round hole was under tension.…”

Section: Figure (7)contrasting

confidence: 65%

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Simulation of the cyclic bending response for 6061-T6 aluminum round-hole tubes

2020

JECET

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In this paper, the simulation of the response for 6061-T6 aluminum alloy round-hole tubes with different hole diameters of 2, 4, 6, 8 and 10 mm subjected to cyclic bending is studied. The experimental results tested by Lee et al. [1] were employed in this study. It can be seen that the moment-curvature relationships showed a closed and stable loop from the first bending cycle. The hole diameters have very small influence on the loop shape. But, the ovalization-curvature relationships depicted an asymmetrical, ratcheting, and bow trend. The hole diameter revealed a strong influence on this relationship. Furthermore, higher hole diameters caused larger tube's ovalizations. Finally, the finite element software ANSYS was employed to analyze the moment-curvature and ovalization-curvature relationships. Through comparison with the experimental data, the ANSYS could properly simulate the experimental findings.

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Section: Figure (7)contrasting

confidence: 65%

“…Chung et al [5] inspected the cyclic bending response and buckling of sharp-notched 6061-T6 aluminum alloy tubes. Later, Lee et al [6] studied the behavior of local sharp-notched 6061-T6 aluminum alloy tubes under cyclic bending. The type of the local sharp notch was a local sharp cut.…”

Section: Figure (1): a Schematic Drawing Of A Round-hole Tubementioning

confidence: 99%

Simulation of the cyclic bending response for 6061-T6 aluminum round-hole tubes

2020

JECET

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“…In 2016, Lee et al 28 explored the mechanical behavior of local sharp-cut 6061-T6 aluminum alloy tubes subjected to cyclic bending. In their study, the ANSYS was employed to simulate the DD o /D o -k and M (moment)-k relationships.…”

Section: Introductionmentioning

confidence: 99%

Response of round-hole tubes submitted to pure bending creep and pure bending relaxation

Lee¹,

Liu

Pan

2021

Advances in Mechanical Engineering

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This paper presents experimental study on the response of 6061-T6 aluminum alloy round-hole tubes with five different hole diameters of 2, 4, 6, 8, and 10 mm and four different diameter-to-thickness ratios of 30, 40, 50, and 60 submitted to pure bending creep and pure bending relaxation. Pure bending creep or relaxation is defined as bending the tube to the required moment or curvature and maintaining that moment or curvature for a period of time. The experimental results of pure bending creep show that the curvature increases with time. In addition, larger holding moment, diameter-to-thickness ratio, or hole diameter results in larger creep curvature. As the curvature continues to increase, the round-hole tube eventually breaks. The experimental results of pure bending relaxation show that the relaxation moment decreases sharply with time and tends to a stable value. In addition, larger holding curvature, diameter-to-thickness ratio, or hole diameter results in larger drop of the relaxation moment. Due to fixed curvature, the round-hole tube does not break. Finally, formulas proposed by the research team of Pan et al. were respectively improved to simulate the creep curvature-time relationship for pure bending creep in the initial and the secondary stages and the relaxation moment-time for pure bending relaxation. After comparing with the experimental results, it is found that theoretical analysis can reproduce the experimental results reasonably.

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“…However, all of the above-mentioned studies are for circumferential notched tubes. Thereafter, Lee et al [17] inspected the cyclic bending degradation and failure of 6061-T6 aluminum alloy tubes with local sharp cuts. In addition, the relationship between bending moment (M)-curvature (κ) and ΔDo/Do-κ was analyzed by ANSYS.…”

Section: Introductionmentioning

confidence: 99%

Variation of the 90° Redundant-hole Diameter Effect on the Response and Failure of Round-hole 6061-T6 Aluminum Alloy Tubes under the Cyclic Bending

Lee¹,

Pan²

2020

J. Civ. Eng. Constr.

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This paper presents an experiment and an analysis for examining the variation of the 90° redundant-hole diameter effect on the cyclic bending mechanical behavior and fracture failure of round-hole 6061-T6 aluminum alloy tubes. In this investigation, a round-hole 6061-T6 aluminum alloy tube with a 6 mm hole diameter was drilled to obtain a 90° redundant hole but with different hole diameter of 2, 4, 6, 8, or 10 mm. It can be observed that from the first bending cycle, the bending moment-curvature curve describes a stable loop. The diameter of the 90° redundant hole has little effect on the bending moment-curvature relationship. However, when the number of bending cycles increases, the ovalization-curvature curve shows an increasing, asymmetrical, ratcheting, and bow-like tendency. The diameter of 90° redundant-hole shows a significant influence on the ovalization-curvature relationship. In addition, five non-parallel straight lines corresponding to five different 90° redundant hole diameters were discovered for the controlled curvature-number of bending cycles necessary to cause failure relationship on the double logarithmic coordinates. Finally, a formula was presented to simulate the above relationship. It is found that the experimental and analytical data were in good agreement.

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Failure life estimation of sharp-notched circular tubes with different notch depths under cyclic bending

Cited by 8 publications

References 33 publications

Simulation of the cyclic bending response for 6061-T6 aluminum round-hole tubes

Simulation of the cyclic bending response for 6061-T6 aluminum round-hole tubes

Response of round-hole tubes submitted to pure bending creep and pure bending relaxation

Variation of the 90° Redundant-hole Diameter Effect on the Response and Failure of Round-hole 6061-T6 Aluminum Alloy Tubes under the Cyclic Bending

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