Radiation Characteristics of Ultrasonic Tip Echo and Its Application to Detect Fatigue Crack Closure in Welding Residual Stress Fields

Miki, Chitoshi; Onishi, Ryohei; Kubota, Takumi; Hanji, Takeshi

doi:10.2208/jsceseee.27.28s

Cited by 3 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the previous studies, it is known that to detect anomalies in bridge structures, the evaluation of changes in vibration characteristics, such as frequency and damping, is effective, as well as the detection of changes in the shapes of components as a result of deformation. (4)(5)(6)(7)(8) For the monitoring system, wireless sensor technologies (6,9,10) have been adopted to reduce the installation time and cost in the deployment of the system. Wireless sensor systems enable us to build a long-term health monitoring system for bridges more easily.…”

Section: Introductionmentioning

confidence: 99%

“…In vibration measurements using wireless monitoring systems, MEMS acceleration sensors are normally used considering size and cost. (6,10) In order to obtain the deformation shapes of structural components, conventional strain measurements and displacement measurements have been conducted, and for wireless monitoring systems, methods of conversion from acceleration to displacement have been investigated. (11,12) However, MEMS acceleration sensors can include noise in data, and this causes large calculation errors in the double integration of acceleration for its conversion to displacement, so it is difficult to obtain accurate information on displacement in many cases.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Vibration Sensors Using Power Generation with Electret for Bridge Monitoring

Sasaki¹,

Ueda²,

Takeya³

et al. 2017

Sensors and Materials

View full text Add to dashboard Cite

The structural monitoring of civil engineering structures such as bridges has been of importance recently, and one of the key issues in structural monitoring is to grasp the dynamic behaviors of the structures. In this study, by utilizing the power generation characteristics of electrets, new innovative vibration sensors are investigated using electret material. The concept and the fundamental characteristics of the power generation sensors were described. Furthermore, the development of a new very low resonance frequency vibration sensor with electrets was undertaken, and the performance of the new sensors was evaluated.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibration Sensors Using Power Generation with Electret for Bridge Monitoring

Sasaki¹,

Ueda²,

Takeya³

et al. 2017

Sensors and Materials

View full text Add to dashboard Cite

show abstract

Fiber Bragg grating sensor fatigue crack real-time monitoring based on spectrum cross-correlation analysis

Bao

Yuan

Dong

et al. 2013

Journal of Sound and Vibration

View full text Add to dashboard Cite

Measurement Method for Welding Residual Stress in Steel I-Shaped Girder With Thick Flange and Its Influence on Load-Carrying Capacity for Bending

Miyashita

Inaba

Hirayama³

et al. 2015

Journal of JSCE

View full text Add to dashboard Cite

Along with the spread of steel bridges with I-shaped girders, the use of thick steel plates has been increasing in recent years. It is feared that residual stress in the thick plate affects the girder's load-carrying capacity, yet residual stress measurement data are insufficient. Consequently, the load-carrying capacity curves used in the Japan Highway Bridge Specifications are based on old data. In this study, a test specimen that simulates the welding section between the main girder web and thick flange is elaborated; the residual stress distribution is also measured in the flange plate width and thickness direction using a mechanical cutting method. In the plate thickness direction measurement, accuracy of the measurement is sacrificed in order to propose a simple and easy measurement method. It is found that the slope of stress distribution in the plate thickness direction increases as the thickness of the plate increases. Then, considering a three-dimensional equilibrium of residual stress, the intermediate support of an existing bridge is modeled. From the elasto-plastic finite element analysis, it is confirmed that the residual stress in the thick plate does not affect the load-carrying capacity for the bending of steel girders.

show abstract

Radiation Characteristics of Ultrasonic Tip Echo and Its Application to Detect Fatigue Crack Closure in Welding Residual Stress Fields

Cited by 3 publications

References 9 publications

Vibration Sensors Using Power Generation with Electret for Bridge Monitoring

Vibration Sensors Using Power Generation with Electret for Bridge Monitoring

Fiber Bragg grating sensor fatigue crack real-time monitoring based on spectrum cross-correlation analysis

Measurement Method for Welding Residual Stress in Steel I-Shaped Girder With Thick Flange and Its Influence on Load-Carrying Capacity for Bending

Contact Info

Product

Resources

About