Several studies on Digital Image Correlation technique allowed this methodology to be recognised in the last decade as a welloptimised tool for mechanical experimental measures, but much work is done apply DIC based analyses advanced applications, such fatigue damage and composite materials failure investigations. gives direct measure of displacement field using well defined formulation matching images loaded load free component, so that vectors can evaluated certain number grid reference...

In the present study, a new dissipation device for seismic protection of structures is proposed. This designed to dissipate energy entering structure during an earthquake through activation hysteretic loops aluminum plate located in middle itself. To maximize amount dissipated energy, we performed design requiring that stressed almost uniform way. particular, concentrate core, whereas external steel plates are dimensioned give adequate stiffness and limit instability phenomena....

In recent years many techniques for the seismic control of structures have been developed. Among these, metallic hysteretic devices are able to dissipate a great amount energy entering building during event, thanks stable behavior under cyclic loads that produces wide hysteresis loop. Steel shear panels examples elasto-plastic elements, which behavior. Generally such dampers known possess large energydissipation capacity relative their size; they cost-effective and protect nonstructural...

A CDM (continuum damage mechanics) model for evaluation is here considered and applied to the study of two different typologies notched cylindrical specimens. The presents some parameter authors determined them in a previous work testing smooth Firstly fatigue characterization was conducted SN curves found. In order evaluate capability predict sequence effect simulate more realistic loading condition, tests with various blocks were carried on particular high-low, low-high random three...

Dissimilar Ti–Al laser weldings are very interesting due to their difficulties in being processed because of the different physical properties alloys and crack formations during cooling solidification. In this study, effect offset defocusing on microstructure, geometry mechanical response 2 mm thick dissimilar AA6061/Ti-6Al-4V welds was analyzed. Moreover, order reduce residual stresses, joints were both heat-treated mechanically treated by ultrasonic peening. The microstructure found be...

The aim of this work is to evaluate by numerical simulation the real stress state a welded component subjected sinusoidal external load. In particular, relaxation process residual stress, due application cyclic load, has been studied. Longitudinal joints, laser and 3 mm thick, are analysed in following evolution during fatigue test. A procedure, implemented ABAQUS code, carries out field originated welding it taken as pre-stress condition present simulations. order influence amplitude level...

Abstract: In this study, we evaluated the residual stress field which arose because of a new welding process named ‘friction stir welding’. We analysed aluminium alloy butt‐welded joints. Both similar and dissimilar joints were considered in 2024‐T3 6082‐T6 alloys 0.8 3 mm thick. For each joint, longitudinal transversal distributions obtained direction perpendicular to weld cord. thicker joints, distribution present is very traditional welded It presents, fact, tensile region near cord,...

This paper describes the application of active pulsed Thermography (PT) as a Non-Destructive Test (NDT) method for investigation CFRP aeronautical components. The analyzed specimens include T-shaped stringers, previously monitored by ultrasonic analysis, and laminated flat plates with internal production defects. Several set-up tests allowed to identify optimal configurations defect detection, according specimen geometry location. A custom post-processing algorithm has been developed improve...

In the present work, results of acoustic nonlinear response ultrasonic wave propagation when monitoring progress damage induced by fatigue on notched C45 carbon steel specimens have been reported. Two ultrasound probes were fixed to during tests. The input signal was sinusoidal type, while corresponding acquired and recorded at each stage test means a digital oscilloscope. A frequency study performed data evaluate change in second- third-order nonlinearity coefficients β1 β2, respectively,...

To better address mechanical behavior, it is necessary to make use of modern tools through which possible run predictions, simulate scenarios, and optimize decisions. sources integration. This will increase the capability detecting material modifications that forerun damage and/or forecast stage in future when very likely fatigue initiating propagating cracks. Early warning outcomes obtained by synergetic implementation NDE-based protocols for studying fracture behavior enhance preparedness...

Abstract The present paper is focused on full-field experimental monitoring procedures to be employed during HCF fatigue testing two series of CFRP open hole samples. Two different methodologies based thermographic techniques and displacement measurements with Digital Image Correlation (DIC) analysis are for damage settlement evolution detected up failure, together correspondent compliance analysis. Combined approaches, thermo-elastic dissipative phenomena, stiffness properties variations,...

ABSTRACT This paper deals with the application of a non‐destructive technique based on natural frequencies and damping evaluation to predict fatigue failure closed cell aluminium foams. Two different numerical methods have been used analyse data, detailed analysis about frequency evolution metallic foam specimens subjected load is shown. Moreover, significant correlations between modal data changes due relevant loads in high‐cycle regime extracted; these may be efficiently residual life good...

ABSTRACT Current procedures for evaluating fatigue strength of welded structures may not be consistent with the real behaviour joints. A local strain method prediction WELded joints FAtigue REsistance (WELFARE), by measurements at weld toe, was recently proposed on basis tests more than 10 series (T, cruciform, angular and butt joints) in structural steel, 10–25 mm main‐plate thickness. This paper reports test results obtained from 30 cruciform (3–5 thick) under two load ratios (0.1 −1)...

Fatigue damage is one of the main failure mechanisms structures. In present work Electrical Resistance Changes (ERC) were measured during fatigue tests on notched carbon steel specimens. ERC measurements performed by monitoring change in electrical resistance real-time without interrupting test at various pre-selected time intervals. The temperature specimens was also on-line monitored order to deduce its effect resistance. comparison data initial and different phases showed existence...

In this work, the authors aim at developing a reliable and fast methodology to evaluate wear evolution in tire starting from complete optical 3D scanning. Starting data cloud, semi-automatic was implemented MATLAB extract mean tread radial profiles correspondence of desired angular position tire. These could be numerically evaluated establish presence irregular characteristic parameter groove depth. The reliability robustness firstly tested by applying it several synthetic case studies...

Wood, being renewable and highly abundant material, with excellent high specific strength stiffness, has received increasing attention to be used in performance applications such as the structural element of a battery case an electric vehicle. For successful implementation wood automotive sector, it is, therefore, crucial understand behaviour during after temperature exposure event fire presence/absence oxygen. In this study, mechanical properties thermally modified unmodified European beech...