1,721,067 research outputs found
An enhanced beam-theory model of the mixed-mode bending (MMB) test – Part II: applications and results
Full text linkThe paper presents an enhanced beam-theory (EBT) model of the mixed-mode bending (MMB) test, whereby the specimen is considered as an assemblage of two sublaminates partly connected by an elastic–brittle interface. Analytical expressions for the compliance, energy release rate, and mode mixity are deduced. A compliance calibration strategy enabling numerical or experimental evaluation of the interface elastic constants is also presented. Furthermore, analytical expressions for the crack length correction parameters – analogous to those given by the corrected beam-theory (CBT) model for unidirectional laminated specimens – are furnished for multidirectional laminated specimens, as well. Lastly, an example application to experimental data reduction is presented
An enhanced beam-theory model of the mixed-mode bending (MMB) test – Part I: literature review and mechanical model
Full text linkThe paper presents a mechanical model of the mixed-mode bending (MMB) test used to assess the mixed-mode interlaminar fracture toughness of composite laminates. The laminated specimen is considered as an assemblage of two sublaminates partly connected by an elastic–brittle interface. The problem is formulated through a set of 36 differential equations, accompanied by suitable boundary conditions. Solution of the problem is achieved by separately considering the two subproblems related to the symmetric and antisymmetric parts of the loads, which for symmetric specimens correspond to fracture modes I and II, respectively. Explicit expressions are determined for the interfacial stresses, internal forces, and displacements
Laboratory accreditation in Italy for reference solution production of sucrose in water
No full textThe accreditation of Chemifarm Srl laboratory for the calibration of two characteristics on the same aqueous solution has been
achieved. The process has been
executed by the Italian accreditation body for calibration laboratories
(SIT). This is the first example of a producer of certified reference
solutions in Italy. The solutions are mixtures of sucrose in water at several
concentrations and are characterised for refractive index in the range of
1.33299 to 1.38115 and for mass fraction of sucrose in the range of 0 to 30 (commercially expressed in Brix degrees). Both traceability paths,
obtained through efractometric and gravimetric methods, are reported.
Furthermore, the paper describes the approach adopted to match the
criteria based on ISO Guide 34 and ILAC-G 12, the documents with requirements for certified reference material producers, in compliance with those of ISO/IEC 17025, the norm for the laboratory accreditation
Editorial: Epigenetic and metabolic regulation of immunity during infection or cancer and associated immune biomarkers
No full textT and NK Cell-Based Immunotherapy in Chronic Viral Hepatitis and Hepatocellular Carcinoma
No full textIn chronic viral hepatitis and in hepatocarcinoma (HCC), antigen-specific T cells are deeply exhausted, and evidence of dysfunction has also been observed for NK cells, which can play a pathogenetic role, exerting a regulatory activity on adaptive immune responses [...
Produzione di soluzioni di riferimento di acqua e saccarosio caratterizzate per la frazione di massa e per l'indice di rifrazione
No full textCandida albicans stress mannoproteins as specific target of secretory IgA in mucosal candidiasis.
No full textExplicit expressions for the crack length correction parameters for the DCB, ENF, and MMB tests on multidirectional laminates
Full text linkWe demonstrate the application of the enhanced beam-theory (EBT) model to multidirectional laminated specimens with several stacking sequences and compare our theoretical predictions with experimental results and numerical analyses
An enhanced beam model of the mixed-mode bending (MMB) test
No full textThe paper presents an enhanced model of the mixed-mode bending (MMB) test, commonly used for assessing the mixed-mode interlaminar fracture toughness of composite laminates. The specimen is considered as an assemblage of two identical sublaminates, partly bonded together by an elastic interface. Each sublaminate is modelled as an orthotropic beam, deformable due to bending, extension and shear. The interface is thought of as a continuous distribution of normal and tangential springs, whose elastic reactions produce transverse and axial loads in the sublaminates, as well as distributed couples. The mechanical behaviour of the system is described by a set of eighteen differential equations, endowed with suitable boundary conditions. The problem is split into the superposition of two subproblems, where the applied loads are symmetric and antisymmetric with respect to the interface plane, respectively. This approach allows for a simpler analytical solution and leads to a natural separation of the fracture modes within the context of beam theory. Through lengthy yet elementary calculations, a complete explicit solution to the original problem is deduced, in terms of displacements, internal forces and interfacial stresses. In particular, the mode I and II contributions to the energy release rate and the mode mixity ratio are determined
Candida albicans stress mannoproteins as specific target of secretory IgA in mucosal candidiasis.
No full text- …
