Nonlinear wave propagation in constrained solids subjected to thermal loads

Nucera, Claudio; Scalea, Francesco Lanza di

doi:10.1016/j.jsv.2013.09.018

Cited by 42 publications

(25 citation statements)

References 38 publications

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“…Baby et al, 2008;Xiang et al, 2012) and thermal degradation (e.g. Nucera and Lanza Di Scalea, 2014) have been investigated for the application of nonlinear ultrasonics to detect early onset of damage.…”

Section: Theory and Conceptmentioning

confidence: 99%

Nonlinear vibro-ultrasonics for detection of damage and weak bonds in composites

Dunn¹

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Using composite materials in primary structures requires careful consideration of the ability of the material to withstand service loads, particularly the resistance to impact loads generated through contact with objects during flight or routine maintenance. While perhaps not causing immediate failure of the structure, even small, barely visible levels of damage can cause a decrease in stiffness or strength. It is important to detect this damage at an early stage, lest the damage grow and the strength of the structure be reduced to the level of service loading.

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Section: Theory and Conceptmentioning

confidence: 99%

Nonlinear vibro-ultrasonics for detection of damage and weak bonds in composites

Dunn¹

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“…Ahead of the designing of the prototype, numerical models were developed for the nonlinear guided wave propagating in a rail [11].The models were developed using the higher-order strain energy terms that occur in a constrained structure exposed to thermal changes [12]. Guided wave modes that are confined to the rail's web were selected after coupling guide wave propagation theory in rails and the nonlinear models.…”

Section: Nonlinear Guided Wave For Rail Nt Measurementmentioning

confidence: 99%

Field testing of prototype systems for the non-destructive measurement of the neutral temperature of railroad tracks

et al. 2014

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In both high speed and freight rail systems, the modern construction method is Continuous Welded Rail (CWR). The purpose of the CWR method is to eliminate joints in order to reduce the maintenance costs for both the rails and the rolling stock. However the elimination of the joints increases the risk of rail breakage in cold weather and buckling in hot weather. In order to predict the temperature at which the rail will break or buckle, it is critical to have knowledge of the temperature at which the rail is stress free, namely, the Rail Neutral Temperature (Rail-NT).The University of California at San Diego has developed an innovative technique based on non-linear ultrasonic guided waves, under FRA research and development grants for the non-destructive measurement of the neutral temperature of railroad tracks. Through the licensing of this technology from the UCSD and under the sponsorship of the FRA Office of Research and Development, a field deployable prototype system has been developed and recently field tested at cooperating railroad properties. Three prototype systems have been deployed to the Union Pacific (UP), Burlington Northern Santa Fe (BNSF), and AMTRAK railroads for field testing and related data acquisition for a comprehensive evaluation of the system, with respect to both performance and economy of operation. The results from these tests have been very encouraging. Based on the lessons learned from these field tests and the feedback from the railroads, it is planned develop a compact 2 nd generation Rail-NT system to foster deployment and furtherance of FRA R&D grant purpose of potential contribution to the agency mission of US railroad safety. In this paper, the results of the field tests with the railroads in summer of 2013 are reported.

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“…For example, the phase transition of some materials has been experimentally identified 11 , and the interfacial stress between the matrix and reinforcements in composites was interrogated 12 . The analytical interpretation into the effect of temperature on the material property and nonlinear features in GUWs has been reported 13 , attributing the generation of the nonlinearity to the "an-harmonicity" of the interatomic potential and explicitly depicting the dependence of nonlinear features in GUWs on temperature. However, few explicit techniques have been reported for the application of thermal fluctuation in nonlinear features in GUWs to the evaluation of material acoustic nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

A thermal sensitivity-based approach for enhancing robustness of ultrasonic evaluation of material acoustic nonlinearity

Wang

Yuan

2019

Health Monitoring of Structural and Biological Systems XIII

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Despite demonstrated effectiveness in characterizing material properties or defect, the evaluation of material acoustic nonlinearity is highly prone to measurement contaminations introduced by various practical factors and the low robustness restricts its application. In order to obtain a precise quantification of the material acoustic nonlinearity in a robust manner, an approach based on the thermal fluctuations in nonlinear features of ultrasonic waves is developed. In this approach, the influence of temperature and defect on the interatomic distance is scrutinized analytically, and on this basis, the nonlinear features of ultrasonic waves linked with the temperature and defect is ascertained explicitly, whereby a thermal sensitivity index is proposed. With this thermal sensitivity index, the material acoustic nonlinearity can be evaluated without being affected by contaminations from practical sources, and therefore the defect which intensifies the material acoustic nonlinearity can be identified in a robust manner. Experimental validation corroborates the theoretical prediction, demonstrating that the proposed thermal sensitivity-based approach is capable of enhancing the robustness of material acoustic nonlinearity evaluation and defect characterization.

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Nonlinear wave propagation in constrained solids subjected to thermal loads

Cited by 42 publications

References 38 publications

Nonlinear vibro-ultrasonics for detection of damage and weak bonds in composites

Nonlinear vibro-ultrasonics for detection of damage and weak bonds in composites

Field testing of prototype systems for the non-destructive measurement of the neutral temperature of railroad tracks

A thermal sensitivity-based approach for enhancing robustness of ultrasonic evaluation of material acoustic nonlinearity

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