Theoretical and Applied Fracture Mechanics, Aug 1, 2020
Abstract This research work aims to provide computational remarks for the strength degradation an... more Abstract This research work aims to provide computational remarks for the strength degradation analysis of pre-existing random damages. By means of a novel fatigue-resistance design algorithm, the mixed mode I/II damages are investigated taking into account the effects of stress intensities and mean stresses. Analytical and numerical evaluations in terms of the residual life and crack path are successfully validated against relevant experiments under cyclic loading with constant amplitude and overload.
The aim of the present paper is to evaluate the effect of residual stresses, due to cold-drawing ... more The aim of the present paper is to evaluate the effect of residual stresses, due to cold-drawing process, on the fatigue crack propagation in a pearlitic steel wire with a V-shaped circumferential notch. In order to analyse the effect of the notch severity on the residual stress distribution, three different values of the notch root radius are examined. The residual stress distributions in the reduced cross-section of such wires are numerically evaluated through FE analyses which simulate the material removing operation in the notched region. The stress-intensity factors (SIFs) related to tension loading and residual stresses are computed. Then, the crack propagation under cyclic tension combined with the residual stresses is analysed by taking into account the above SIF values and the actual stress ratio, which is different from that due to cyclic tension only.
In the present paper, the fracture toughness of a polyurethane (PUR) foam (manufactured by Necume... more In the present paper, the fracture toughness of a polyurethane (PUR) foam (manufactured by Necumer GmbH, Germany, under the commercial designation Necuron 651) is experimentally and numerically investigated in order to examine its dependence on the specimen sizes. As a matter fact, to the best knowledge of the present authors, such an analysis is still missing in the technical literature. To perform the experimental campaign, notched PUR foam beams, with different geometrical sizes, are tested under three‐point bending loading, and the Modified Two‐Parameter Model (recently proposed by some of the present authors) is employed to measure the fracture toughness. Subsequently, such an experimental campaign is numerically simulated by applying a micromechanical model, implemented in a non‐linear finite element homemade code. Finally, the results obtained are compared with some experimental data available in the literature, related to the same PUR foam.
Zenodo (CERN European Organization for Nuclear Research), Aug 2, 2021
Abstract In the present paper, the fatigue behaviour of two Ductile Cast Irons (DCIs) is analyzed... more Abstract In the present paper, the fatigue behaviour of two Ductile Cast Irons (DCIs) is analyzed. Both infinite and finite life fatigue tests are simulated by employing the Carpinteri et al. criterion. Such tests, found in the literature, are related to DCI smooth specimens subjected to proportional and non-proportional constant amplitude cyclic loadings. The theoretical results are compared with the experimental ones in terms of both fatigue endurance and fatigue life.
Theoretical and Applied Fracture Mechanics, Aug 1, 2020
Abstract This research work aims to provide computational remarks for the strength degradation an... more Abstract This research work aims to provide computational remarks for the strength degradation analysis of pre-existing random damages. By means of a novel fatigue-resistance design algorithm, the mixed mode I/II damages are investigated taking into account the effects of stress intensities and mean stresses. Analytical and numerical evaluations in terms of the residual life and crack path are successfully validated against relevant experiments under cyclic loading with constant amplitude and overload.
The aim of the present paper is to evaluate the effect of residual stresses, due to cold-drawing ... more The aim of the present paper is to evaluate the effect of residual stresses, due to cold-drawing process, on the fatigue crack propagation in a pearlitic steel wire with a V-shaped circumferential notch. In order to analyse the effect of the notch severity on the residual stress distribution, three different values of the notch root radius are examined. The residual stress distributions in the reduced cross-section of such wires are numerically evaluated through FE analyses which simulate the material removing operation in the notched region. The stress-intensity factors (SIFs) related to tension loading and residual stresses are computed. Then, the crack propagation under cyclic tension combined with the residual stresses is analysed by taking into account the above SIF values and the actual stress ratio, which is different from that due to cyclic tension only.
In the present paper, the fracture toughness of a polyurethane (PUR) foam (manufactured by Necume... more In the present paper, the fracture toughness of a polyurethane (PUR) foam (manufactured by Necumer GmbH, Germany, under the commercial designation Necuron 651) is experimentally and numerically investigated in order to examine its dependence on the specimen sizes. As a matter fact, to the best knowledge of the present authors, such an analysis is still missing in the technical literature. To perform the experimental campaign, notched PUR foam beams, with different geometrical sizes, are tested under three‐point bending loading, and the Modified Two‐Parameter Model (recently proposed by some of the present authors) is employed to measure the fracture toughness. Subsequently, such an experimental campaign is numerically simulated by applying a micromechanical model, implemented in a non‐linear finite element homemade code. Finally, the results obtained are compared with some experimental data available in the literature, related to the same PUR foam.
Zenodo (CERN European Organization for Nuclear Research), Aug 2, 2021
Abstract In the present paper, the fatigue behaviour of two Ductile Cast Irons (DCIs) is analyzed... more Abstract In the present paper, the fatigue behaviour of two Ductile Cast Irons (DCIs) is analyzed. Both infinite and finite life fatigue tests are simulated by employing the Carpinteri et al. criterion. Such tests, found in the literature, are related to DCI smooth specimens subjected to proportional and non-proportional constant amplitude cyclic loadings. The theoretical results are compared with the experimental ones in terms of both fatigue endurance and fatigue life.
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Papers by Andrea Carpinteri