Publications

45 publications from this institution

An axiomatic/asymptotic evaluation of the best theories for free vibration of laminated and sandwich shells using non-polynomial functions

This paper presents Best Theory Diagrams (BTDs) constructed from non-polynomial terms to identify best shell theories for the free vibration analysis of laminated and sandwich shell. The shell theories have been constructed using Axiomatic/Asymptotic Method (AAM). The refined models are implemented following the compactness of a unified formulation developed. The governing equations are derived from the Hamilton’s Principle. Navier-Type solution technique is used for solving the eigenvalue problem of simply supported shell. The BTDs use 3D equilibrium solutions as a reference. The BTDs built from non-polynomial functions are compared with Maclaurin expansions. The results are compared with Layerwise solutions. Cylindrical and spherical shells with different layer-configurations are investigated. The results demonstrate that the shell models obtained from the BTD using non-polynomial terms can improve the accuracy obtained from Maclaurin expansion for a given order of expansion of a displacement field.

J.C. Monge, J.L. Mantari, Samuel Charca et al. 2018Article

Ichu: New Natural Fibers for Composites and its Extraction Methodology

Ichu: New Natural Fibers for Composites and its Extraction Methodology S. Mori, E. Flores, S. Charca Abstract. Natural fibers obtained from plants (vegetables) have been gaining great impulse in the last years, especially in the composites materials industry; besides, studies shows that the annual growth rate will be 10% in the coming years, which will […]

S. Mori, Samuel Charca, Elena Flores 2018Article

Damage Assessment Due to Repeated Slamming of Foam Core Sandwich Composites

Foam core sandwich composite panels repeatedly slammed onto the body of calm water indicate greater accumulation and progression of damage accompanied by lower lifetimes as a function of increasing slamming energy or lower deadrise angle. E—N (slamming energy vs. lifetime) curves showed an exponentially decreasing trend with extensive scatter in the data. E—N curves also differed dramatically when compared with the conventional S—N fatigue life curve. A significant reduction observed in fatigue life of slammed specimens as compared with the non-slammed specimens was used as a basis for the development of a life assessment methodology. Catastrophic failure under slamming resulted from a major crack formation near the chine or the keel depending on the deadrise angle, however, during post-slamming fatigue, failure always occurred near the keel. Core tearing along the interface and core shear were observed to be the dominant modes of failure, while facesheet damage activity was largely absent prior to catastrophic failure.

Samuel Charca, Basir Shafiq 2009Article

Use of fly ash in the production of geopolymers: a literature review

Currently, the high pollution derived from the production of Portland cement is a major problem, therefore the development of alternative cements obtained

Sócrates Pedro Muñoz Pérez, Samuel Charca, Dávila Gamonal Clara Mercedes et al. 2022Article

Theoretical analysis of mechanical properties in natural fibres under quasi-static load: a case study of Ichu and Cabuya

Natural fibres are gradually replacing glass fibres in textile products or wind turbines blades. Stipa Obtusa (Ichu) and Furcraea (Cabuya) are two endemic

Alfredo Teves, Sergio Candiotti, Carlos Santiuste et al. 2023Article

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