Papers by Keyword: Infrared Thermography (IRT)

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Authors: Isamu Oda, Andrew Willett, Mitsuharu Yamamoto, Mitsuru Miyawaki, Naoki Watanabe, Isao Nakagawa
Authors: Isamu Oda, Yuichi Tanaka, Akihisa Masuki, Takeshi Izuma
Authors: N. Srinivasan, N. Raghu, B. Venkatraman
Abstract: Studies on characterizing heterogeneous deformations in many materials under different loading conditions using imaging NDE techniques like Infrared thermography (IRT) and Digital image correlation (DIC) began in the last decade and have been reported by many researchers. This work aims in experimental investigation of one such heterogeneous deformation namely Lüders band phenomenon in welded IS 2062 E250-B mild steel during monotonic, uniaxial tensile testing using IRT and DIC. Also attempt has been made to study the generation of pre-yield microstrain in welded material. An understanding of nucleation and propagation of Lüders band in welded specimen is made based on temperature and strain changes.
Authors: Ji Tong Jiang, Jun An, Xiao Yi Fan, De Run Du, Song Yang
Abstract: In recent years, Infrared thermal imaging technology has been widely used in the detection of construction quality relied on its distinguishing features of non-destruction, non-contact and low cost. But, there are many problems in practice, such as it is difficult to quantify the detection results and determine the best testing time. Aimed to several issues of the infrared-thermography method on detecting the defects of external wall, this paper discusses the determination of the optimum time and puts forward a method which can decide the defects quantitatively; it is the method of temperature rise rate.
Authors: Tejas G. Murthy, C. Huang, M. Ravi Shankar, Srinivasan Chandrasekar, Kevin P. Trumble, John P. Sullivan
Abstract: The temperature and strain rate fields in severe plastic deformation (SPD) are measured using infra-red thermography and Particle Image Velocimetry (PIV), respectively. Plane strain machining is used as the method of SPD to impose controlled strains and strain rates. For metals such as titanium, the temperature rise is small at small strain rates and SPD occurs at near-ambient temperature. The possibility of exploring dynamic recovery/recrystallization phenomena using the Zener-Hollomon parameter in this SPD framework is briefly discussed.
Authors: Jeong Guk Kim
Abstract: The tensile fracture behavior of thermosetting plastic materials was investigated with the aid of a nondestructive evaluation (NDE) technique. The materials, unsaturated polyester resin (UPR), which is applicable to buffer the vibration and impact properties in rail structure, were used for this investigation. In order to explain a stress-strain behavior of plastic sample, the infrared thermography technique was applied. A high-speed infrared (IR) camera was employed for in-situ monitoring of progressive damages of UPR samples during tensile testing. In this investigation, the IR thermography technique was used to facilitate a better understanding of damage evolution, fracture mechanism, and failure mode of thermosetting plastic materials during monotonic loadings.
Authors: Amin Al-Habaibeh, S. Yaseen, R.M. Parkin, Fadel Otham, O. Albar
Abstract: There is an increasing need in modern cities for automated Crowd Condition Monitoring (CCM) in order to provide continuous real-time on-line information regarding the density, number and movement behaviour of crowd within a specific area in order to allow the required level of services and facilities to be specified and directed. This paper describes the novel application of low-cost infrared system for estimating people’s density using infrared thermography. Sensor fusion system is developed to compensate for environmental noise. The results show that the suggested monitoring system could provide an efficient method to estimate crowd’s density.
Authors: Qi Fang Zhu, Ze Ming Sun, Tong Da Ma, Pu Li, Dong Hui Zhang, Vladimir Platonovič Vavilov
Abstract: Active thermal NDT is a promising technique for the detection of structural defects in solids. In this paper, the results of the first-stage research devoted to infrared thermographic detection of cracks in titanium alloys are presented. The test results obtained show that the Fourier analysis is a convenient data processing technique in active thermal NDT. Images of phase are more noise-resistant and able to reveal deeper defects compared to images of amplitude. In application to the inspection of bottom-hole defects in 9.6 mm-thick Ti6Al4V titanium alloy samples, it has been found that a minimum detected defect should have diameter from one to two times greater than its depth.
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