Abstract
<p>Experimental procedures are often involved in the numerical models validation. To define the behaviour of a structure, its underlying dynamics and stress distributions are generally investigated. In this research, a multi-instrumental and multi-spectral method is proposed in order to validate the numerical model of the Inspection Robot mounted on the new San Giorgio's Bridge on the Polcevera river. An infrared thermoelasticity-based approach is used to measure stress-concentration factors and, additionally, an innovative methodology is implemented to define the natural frequencies of the Robot Inspection structure, based on the detection of ArUco fiducial markers. Established impact hammer procedure is also performed for the validation of the results.</p>
Highlights
In design and materials engineering, experimental validation of numerical models is commonly required in order to verify the quality of the simulation [1], [2]
The stress concentration factor was evaluated in two critical areas, T1 and T2, whose thermal acquisitions and finite element models are shown in Figure 6 and Figure 7, respectively
The stress concentration factors Kf, as described by (6), were evaluated from the profiles in Figure 7 and Figure 8, and they are shown in Table 1, obtained from the experiments and the FEM model
Summary
In design and materials engineering, experimental validation of numerical models is commonly required in order to verify the quality of the simulation [1], [2]. A stress concentration factor is usually considered during the design of a structure and, it is one of the experimental validations focuses. In last decades, non-contact measurement methods for full-field stress and strain distribution estimation were developed and commonly employed in experimental validation tests, such as the Thermoelastic Stress Analysis (TSA) [11]. According to the thermoelastic effect, for a dynamically excited structure, the surface temperature changes, measured by means of an infrared detector, are proportional to the stress and strain tensors changes, caused by the input load [12]. Thermoelastic Stress Analysis was involved in multiple researches, regarding non-destructive testing [13], defect identification [14], and material properties characterization [15], [16]. When a flexible structure is excited at or close to one of its natural frequencies, significantly increased fatigue damage occurs [23]–
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