Ultrasonic Fatigue Test for a High Strength Steel Plate

Yeom, Hyunho; Jung, Yong Chan; Kim, Chayeong; Kang, Ki-Young; Lee, Moon Gu; Hong, Min-Sung; Jeon, Yongho

doi:10.7735/ksmte.2015.24.6.589

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…In this instance, the number of repetitions or time of the load until the fracture of the material under cyclic loads is referred to as fatigue life. In fact, fatigue has mostly been reported as the cause of damage to machines and structures, and it causes human casualties and property damage [12]. To minimize such damage, it is necessary to predict and design the fatigue life of material as a reference [13].…”

Section: Introductionmentioning

confidence: 99%

Safety Analysis of Fastening Device of Agricultural By-Product Collector in Various Ground Conditions

Kim,

Sri,

Hwang

et al. 2023

Agriculture

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In this study, to evaluate the safety of the fastening device, which is a vulnerable part of the agricultural by-product collector, the stress in fastening devices was measured, and the operational and driving safety were analyzed by deriving the static safety factor and fatigue life. The position with the maximum stress in fastening devices was identified through structural analysis simulation, and a stress measurement system was constructed using strain gauges. Test conditions for stress measurement were classified into three operating conditions (collection operation, driving with the loading part lifted to the highest point, and driving with the loading part lifted to the lowest point) and three soil conditions (even pavement, sloped pavement, and farmland). A process for deriving the fatigue life based on the measured stress was constructed by applying the rain-flow counting method, Goodman equation, and Palmgren–Miner’s rule via commercial software. From the stress measurement results, the collection operation exhibited the highest maximum stress, followed by driving with the loading part lifted to the highest point and driving with the loading part lifted to the lowest point. Under all conditions, the static safety factor of the fastening devices was found to be higher than 1.0 (1.16–1.33). The fatigue life of the fastening devices was also found to be longer than the service life of Korean agricultural machinery under all operating conditions. Therefore, the fastening devices are expected to operate safely under generated static and dynamic loads. The agricultural by-product collector can perform agricultural work and drive stably and is expected to contribute to reducing unnecessary labor force for Korean farms.

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Section: Introductionmentioning

confidence: 99%

Safety Analysis of Fastening Device of Agricultural By-Product Collector in Various Ground Conditions

Kim,

Sri,

Hwang

et al. 2023

Agriculture

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Safety Evaluation on a Fastening Device of an Agricultural By-Product Collector for Hard Flat Ground Driving

2022

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In this study, the static safety factor and fatigue life of fastening devices of an agricultural by-product collector were evaluated under hard flat ground driving conditions. The strain gage-based measurement system was constructed, and the strain gage was attached on the highest stress spot of the fastening devices derived from structural analysis. The static safety factor and fatigue life of the fastening devices were calculated using the measured strain values and by converting it into stress data. The two operating conditions are considered to be the loading part of the by-product collector, lifted and non-lifted. The results for all fastening devices showed that the static safety factor was larger than 1.0 and the fatigue life was much greater than the expected lifetime under both operating conditions. Therefore, it can be concluded that the fastening devices of the by-product collector can be operated reliably under hard flat ground driving conditions. In future work, we plan to evaluate the safety of the fastening devices in various actual orchard farm environments.

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A Study on the Dissimilar Metal Joining of Aluminum to Steel Using the Arc Heat Source (Ⅳ) - Fatigue Behaviors Using Ultrasonic Elastic Resonance -

김

조²,

이

2018

Journal of Welding and Joining

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In order to commercialize the Fe-Al joining technology using arc heat source, it is necessary to guarantee about static and dynamic strength. However, no studies have been conducted to evaluate the fatigue strength of Al-Fe joints using arc heat sources. Therefore, ultrasonic fatigue test to the overlap joint structure of dissimilar materials was examined at first. For the ultrasonic elastic resonance experiment, the plate type specimen of the overlap joint was designed based on the design theory of the ultrasonic fatigue specimen. As a result, it was confirmed that the ultrasonic fatigue test for the overlap joint was sufficiently applicable through the thermal imaging camera measurement. Also the result of ultrasonic fatigue test according to the heat input and the presence of gap, the fatigue life depend on increasing heat input was reduced due to inverse proportion to the growth of the root pore. On the other hand, if the gap is present, fatigue life is improved up to 25% as much as the static strength by removing a considerable amount of pores. When compared to other studies on the fatigue of aluminum lap joints, this fatigue limit is sufficiently competitive if a method to control the pores is constructed.

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Ultrasonic Fatigue Test for a High Strength Steel Plate

Cited by 4 publications

References 2 publications

Safety Analysis of Fastening Device of Agricultural By-Product Collector in Various Ground Conditions

Safety Analysis of Fastening Device of Agricultural By-Product Collector in Various Ground Conditions

Safety Evaluation on a Fastening Device of an Agricultural By-Product Collector for Hard Flat Ground Driving

A Study on the Dissimilar Metal Joining of Aluminum to Steel Using the Arc Heat Source (Ⅳ) - Fatigue Behaviors Using Ultrasonic Elastic Resonance -

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