1,721,012 research outputs found
DISPOSITIVO PER PROVE DI RESISTENZA ALLA FRATTURA IN MODO III SU GIUNZIONI INCOLLATE
No full textL’invenzione concerne un dispositivo per prove di resistenza alla frattura su giunzioni incollate, che sia in grado di selezionare unicamente il modo III, in maniera da non dover ricavare i valori di resistenza a posteriori dopo aver utilizzato più dispositivi con tecniche diverse
DETERMINAZIONE SPERIMENTALE DELLA RESISTENZA DI GIUNZIONI INCOLLATE ALLA FRATTURA DI MODO III
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Surface crack subject to mixed mode loading: numerical simulations and experimental tests
No full textIndagine numerico sperimentale del comportamento post-buckling di pannelli aeronautici con e senza irrigidimenti caricati a taglio
No full textMulti-axial fatigue numerical crack propagations in cruciform specimens
Full text linkTwo cracks, initiated from the opposite tips of a central notch inclined by 45°, were considered in cruciform specimens made of Ti6246. A static load was applied to a cruciform arm while a cyclic load was applied along the other arm. Fatigue propagation of cracked specimens was performed by means of Dual Boundary Element Method (DBEM) and Finite Element Method (FEM) codes. For crack path assessment, the Minimum Strain Energy Density (MSED) and the Maximum Tensile Stress (MTS) criteria were adopted in DBEM and FEM approaches, respectively. Moreover, the J and M integrals’ formulations were used to evaluate the SIFs along the crack fronts for DBEM and FEM codes, respectively. Crack-growth rates were predicted by using a Walker law, calibrated on mode I fracture experimental data. A good agreement between numerical and experimental crack paths was obtained
About Confusion Among Products And Manufacturers
No full textThe boundary between a product copied and a new product, with the same functions of the existing ones, is difficult to establish, since both are based on previous common technical knowledge and the need to satisfy the consumer perception of the product. Starting from the analysis of a case study in the matter of legal challenges concerning alleged patent infringement, some considerations on this topic and patterns of new products development in established markets are presented. It emerges that technical knowledge combined with market and managers requirements and constraints induce similar products design. This is why companies developing new products based on existing concepts often face a lawsuit, moved from that competitor whose market is unjustly threatened
A novel fixture for measuring mode III toughness of bonded assemblies
No full textA method is presented for studying bonded assemblies under pure mode III loading. It is based upon a novel fixture that can be mounted on a common universal testing machine and is able of realizing pure anti-plane shear conditions. Twisting of the bonded assembly generates a smoothly propagating circular crack front that allows for accurate measurements during the test. Data reduction is carried out based on the global load-displacement response and material properties are identified. Results are presented that demonstrate the capabilities of the proposed approach to provide mode III fracture parameters of adhesively bonded joints
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