Probabilistic method for the analysis of widespread fatigue damage in structures

Shkarayev, Sergey; Krashanitsa, Roman

doi:10.1016/j.ijfatigue.2004.07.005

Cited by 15 publications

(6 citation statements)

References 16 publications

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“…*hengyk@ihep.ac.cn; According to Wertheim's stress-optical law, the stress difference of two mutually perpendicular principal stresses has the relationship with the difference of refractive indexes in the corresponding directions. Therefore, the stress difference which is related to the optical path difference of ordinary light and extraordinary light can be got, and the expression can be described below as the stress in one direction is not significant or negligible (1) Here, δ is optical path difference, C is the stress optical coefficient of PMMA and d is acrylic thickness along light path. C can be calibrated accurately, and δ can be detected by the equipment and calculated by numerical fitting according to the expression below [4] (2)…”

Section: Principle and Methods Of The Nove Detection Equipmentmentioning

confidence: 99%

The novel detection equipment of residual stress of PMMA

Heng,

Yang

2023

Applied Optical Metrology V

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PMMA is widely used in aquariums, windows of planes and submarines, and even scientific experiments like the Jiangmen Underground Neutrino Observatory (JUNO). Residual stress in PMMA has an important influence on its craze, creep and lifetime. The novel detection equipment of residual stress of PMMA was developed using spectral measurement and analysis technology based on the principle of stress birefringence and Wertheim's stress-optical law. There are two advantages of the novel detection equipment -the optical path difference is obtained through multi-wavelength spectral analysis instead of single-wavelength analysis, and the measurement accuracy of residual stress is better; the detection equipment can not only analyze PMMA samples in laboratory, but in actual engineering.

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Section: Principle and Methods Of The Nove Detection Equipmentmentioning

confidence: 99%

The novel detection equipment of residual stress of PMMA

Heng,

Yang

2023

Applied Optical Metrology V

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“…Excessive internal stress will put acrylic in an unstable state, which can lead to a decrease in its strength or even fracture. In addition, excessive internal stress can also have an adverse effect on fatigue life and creep behavior of acrylic [1]. The measurement of internal stress can reflect the state and potential problems of acrylic itself, which can help determine the relationship between internal stress and specific structure, estimate the further development and affected areas of internal stress in acrylic, and provide reference for taking effective protection measures [2,3].…”

Section: Introductionmentioning

confidence: 99%

The novel equipment for measuring internal stress in acrylic

Yang,

Heng,

Chen

et al. 2024

J. Inst.

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Acrylic is widely used in aquariums, windows of planes and submarines, and even scientific experiments like the Sudbury Neutrino Observatory (SNO) and the Jiangmen Underground Neutrino Observatory (JUNO). Internal stress has a significant impact on the properties and characteristics of acrylic such as strength, fracture and creep, which is highly concerned and has become a hotspot in research field. The measurement of internal stress is an important issue, which includes two aspects - the calibration of stress-optical coefficient of acrylic and the measurement of birefringence optical path difference (BOPD) caused by internal stress. The measuring equipment mainly realize the measurement of BOPD, and currently have the largest dynamic range of 50–3000 nm. Dynamic range is considered as one of the core performance indicators of measuring equipment, and a larger dynamic range is urgently required to meet the needs of different scenarios. The novel equipment for measuring internal stress in acrylic has been designed and developed based on photo-elastic principle and spectrometric method, which has the dynamic range of 20–12000 nm and the uncertainty of stress measurement better than 3%. The measuring principle, components, functions and measurements of the novel measuring equipment are introduced and discussed in this article.

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“…Among the factors affecting material quality and structure life, stress plays a vital role. Stress can cause material warping or distortion, cracking, and even material failure [1]. Stress measurement can reflect the state of the material itself and potential problems, so it has very important research and application significance.…”

Section: Introductionmentioning

confidence: 99%

The automatic measurement system for internal stress of acrylic

Yang

Heng

Chen³

et al. 2023

J. Inst.

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The manual measurement system for internal stress of acrylic was designed and realized, which is based on photo-elastic principle and spectrometric method. The manual measurement system can support mobile and quantitative measurement, and plays an important role in the fields of material research and engineering project. With the extensive application of the stress measurement system, automation is required to promote measuring efficiency and overcome the shortcomings of the manual measurement system. Electric control turntable was chosen as the key component for automation and adopted in the automatic measurement system. The automatic measurement system is controlled by program and user interface for operation has also been improved. The automatic measurement system has been realized and used for measuring internal stress of acrylic in the laboratory, which achieved the expected effect. The components of the automatic measurement system, the user interface for control program and data processing, and the stress measurements of the acrylic samples by the automatic measurement system are discussed in this article.

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Probabilistic method for the analysis of widespread fatigue damage in structures

Cited by 15 publications

References 16 publications

The novel detection equipment of residual stress of PMMA

The novel detection equipment of residual stress of PMMA

The novel equipment for measuring internal stress in acrylic

The automatic measurement system for internal stress of acrylic

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