Effect of Laser Peening on Improving Fatigue Strength of Welded Rib of High-Strength Steel

Sakino, Yoshihiro; Yoshikawa, Kunio; Sano, Yuji; Sumiya, Rie

doi:10.2207/qjjws.34.20

Cited by 5 publications

(5 citation statements)

References 10 publications

(7 reference statements)

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“…The main factor in this improvement was the generation of compressive residual stress [22]. In the fatigue tests of the test specimens in which the rib was boxing welded, it was confirmed that improvements in fatigue strength due to laser peening took place not only in ordinary steel but also in HT780 high-strength steel [23].…”

Section: Laser Peening Processmentioning

confidence: 78%

Effect of Laser Peening with a Microchip Laser on Fatigue Life in Butt-Welded High-Strength Steel

2021

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Laser peening introduces compressive residual stresses on the surfaces of various materials and is effective in enhancing fatigue strength. Using a small microchip laser, with energies of 5, 10, and 15 mJ, the authors applied laser peening to the base material of an HT780 high-strength steel, and confirmed compressive residual stresses in the near-surface layer. Laser peening with a pulse energy of 15 mJ was then applied to fatigue samples of an HT780 butt-welded joint. It was confirmed that laser peening with the microchip laser prolonged the fatigue life of the welded joint samples to the same level as in previous studies with a conventional laser.

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Section: Laser Peening Processmentioning

confidence: 78%

Effect of Laser Peening with a Microchip Laser on Fatigue Life in Butt-Welded High-Strength Steel

2021

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“…It is clear that, the fatigue performance of 300mJ with water is the best one compared with dry fatigue. The reason is that water generates high pressure plasma, and the strength of material surface is improved owing to the impact force by the plasma (SaKino, et al, 2009).…”

Section: Fatigue Results (S-n Curve)mentioning

confidence: 99%

“…Irradiation by a strong laser pulse, exceeding the abrasion threshold, on a material submerged in water converts the material surface to plasma and generates high pressure plasma on the surface. Under water, the inertia of the water prevents the plasma from expanding, which consequently concentrates the laser energy in small area (Sakino, 2009). The plasma absorbs subsequent laser energy and generates a heat-sustained shock wave, which impinges on the material with an intensity of several gigapascals, far exceeding the yield strength of the material (Standard Test Methods, 2003).As a result, the plasma pressure becomes 10-100 times larger than in atmosphere and reaches Gpa levels.…”

Section: Introductionmentioning

confidence: 99%

“…The shockwave causes plastic deformation of the material, and the restraint from the surrounding non-deformed spots generates compressive residual stress on the surface. The residual stress can be generated evenly and without scattering by continuously irradiating the object by moving the laser beam (Sakino, 2009). Laser peening changes tensile residual stress to compressive.…”

Section: Introductionmentioning

confidence: 99%

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Improving Fatigue Life of Bolt Adapter of Prosthetic SACH Foot

Jweeg¹,

Resan²,

Najm³

2023

jcoeng

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In this research an analysis for improving the fatigue behavior (safety factor of fatigue) of non- articular prosthetic foot (SACH) in the region (Bolt Adapter).The laser peening was carried to the fatigue specimens to improving the fatigue properties of bolt’s material. The tests of mechanical properties and fatigue behavior were carried for material that the bolt manufacture from it, a region where the failure occur and inserted of these properties to the program of engineering analysis (Ansys) to calculate the safety factor of fatigue. The results showed that the safety factor after hardening by laser is increased by 42.8%.

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“…Double fists are punched from the midline of the human body in turn, attacking the midline of the opponent's body, and retracted from the midline, that is, the principle of "keeping the center and using the center." is requires the neck, shoulders, elbows, wrists, waist, thighs, knees, and ankles to form a whole [12,13]. Pile work is extremely important when distributing inch strength: clamp the knee, levator anus, abdomen, hold the chest, pull the back, straighten the head, and ask in front of the hand; the whole body is shaped like an arrow, and with the help of the reaction force of the ground, the joints of the whole body are instantaneously energized in one direction, sending out the Cun Jin of Wing Chun [14].…”

Section: The Effect Of Wing Chun Japanese Punchingmentioning

confidence: 99%

The Effect of Wing Chun Day Punch Boxing Based on Embedded Microprocessor

Si-le

Chen

et al. 2022

Wireless Communications and Mobile Computing

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With the popularity of Wing Chun film and television themes in recent years, Wing Chun has gradually received more and more attention, but the impact of Japanese punching boxing is rarely involved. The purpose of this article is to study the impact of Wing Chun Day Punch Boxing based on embedded microprocessor, to understand the actual effect of Wing Chun Day Punch Boxing through the analysis of the beat effect, and to provide reference and help for the research of traditional Chinese martial arts. In this paper, experimental methods and mathematical statistics combined with embedded microprocessors are used to research and analyze the punching effect of Wing Chun word punching. And it calculates the speed, angle, angular velocity, angular acceleration, muscle discharge sequence, and other data of various parts of the body during the process of Wing Chun force release to reveal the hitting effect of Wing Chun day word punching. Five Wing Chun practitioners with different training times are selected for Wing Chun day punch training, using engineering dummies for experiments, relying on acceleration sensors, position sensors, and force sensors. Starting from the direction of dynamics and kinematics, it collects the effective data of the Japanese word punch, then analyzes the experimental results through the embedded microprocessor, and obtains the hitting effect of the Wing Chun Japanese word punch. Experiments show that, through the analysis of the force angle and characteristics of the Japanese punch, the subjects’ elbow joint angle changes significantly when doing the Japanese punch. In the experiment on the force measurement engineering dummy, when the subjects punched, the measurement results of the vibration acceleration of the internal organs of different subjects were p > 0.01 , and there was no significant difference. However, in the case of elbow joint 150° preparation, the midline punch is significantly larger than the punch directly in front of the shoulder, and the difference is statistically significant (significant level p < 0.01 ).

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Effect of Laser Peening on Improving Fatigue Strength of Welded Rib of High-Strength Steel

Cited by 5 publications

References 10 publications

Effect of Laser Peening with a Microchip Laser on Fatigue Life in Butt-Welded High-Strength Steel

Effect of Laser Peening with a Microchip Laser on Fatigue Life in Butt-Welded High-Strength Steel

Improving Fatigue Life of Bolt Adapter of Prosthetic SACH Foot

The Effect of Wing Chun Day Punch Boxing Based on Embedded Microprocessor

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