Biocomposites reinforced with natural fibers: 2000–2010

Synthesis and application of epoxy resins: A review

This work is an overview of available theories and finite elements that have been developed for multilayered, anisotropic, composite plate and shell structures. Although a comprehensive description of several techniques and approaches is given, most of this paper has been devoted to the so called axiomatic theories and related finite element implementations. Most of the theories and finite elements that have been proposed over the last thirty years are in fact based on these types of approaches. The paper has been divided into three parts. Part I, has been devoted to the description of possible approaches to plate and shell structures: 3D approaches, continuum based methods, axiomatic and asymptotic two-dimensional theories, classical and mixed formulations, equivalent single layer and layer wise variable descriptions are considered (the number of the unknown variables is considered to be independent of the number of the constitutive layers in the equivalent single layer case). Complicating effects that have been introduced by anisotropic behavior and layered constructions, such as high transverse deformability, zig-zag effects and interlaminar continuity, have been discussed and summarized by the acronimC
 -Requirements. Two-dimensional theories have been dealt with in Part II. Contributions based on axiomatic, asymtotic and continuum based approaches have been overviewed. Classical theories and their refinements are first considered. Both case of equivalent single-layer and layer-wise variables descriptions are discussed. The so-called zig-zag theories are then discussed. A complete and detailed overview has been conducted for this type of theory which relies on an approach that is entirely originated and devoted to layered constructions. Formulas and contributions related to the three possible zig-zag approaches, i.e. Lekhnitskii-Ren, Ambartsumian-Whitney-Rath-Das, Reissner-Murakami-Carrera ones have been presented and overviewed, taking into account the findings of a recent historical note provided by the author. Finite Element FE implementations are examined in Part III. The possible developments of finite elements for layered plates and shells are first outlined. FEs based on the theories considered in Part II are discussed along with those approaches which consist of a specific application of finite element techniques, such as hybrid methods and so-called global/local techniques. The extension of finite elements that were originally developed for isotropic one layered structures to multilayerd plates and shells are first discussed. Works based on classical and refined theories as well as on equivalent single layer and layer-wise descriptions have been overviewed. Development of available zig-zag finite elements has been considered for the three cases of zig-zag theories. Finite elements based on other approches are also discussed. Among these, FEs based on asymtotic theories, degenerate continuum approaches, stress resultant methods, asymtotic methods, hierarchy-p,_-s global/local techniques as well as mixed and hybrid formulations have been overviewed.

Theories and Finite Elements for Multilayered, Anisotropic, Composite Plates and Shells

A review: Fibre metal laminates, background, bonding types and applied test methods

Accuracy of machined components is one of the most critical considerations for any manufacturer. Many key factors like cutting tools and machining conditions, resolution of the machine tool, the type of workpiece etc., play an important role. However, once these are decided upon, the consistent performance of the machine tool depends upon its ability to accurately position the tool tip vis-a-vis the required workpiece dimension. This task is greatly constrained by errors either built into the machine or occurring on a periodic basis on account of temperature changes or variation in cutting forces. The three major types of error are geometric, thermal and cutting-force induced errors. Geometric errors make up the major part of the inaccuracy of a machine tool, the error caused by cutting forces depending on the type of tool and workpiece and the cutting conditions adopted. This part of the paper attempts to review the work done in analysing the various sources of geometric errors that are usually encountered on machine tools and the methods of elimination or compensation employed in these machines. A brief study of cutting-force induced errors and other errors is also made towards the end of this paper.

Error compensation in machine tools — a review: Part I: geometric, cutting-force induced and fixture-dependent errors

The transverse shear effect should be included in calculating the natural frequencies of advanced composite material because of its high ratio of elastic modulus to shear modulus. The method which can include the transverse shear effect in calculating the natural fre quencies of thin orthotropic composite shells has been developed using the energy method (Rayleigh-Ritz method). In order to formulate the energy equations, the displacement equations which include the first order and sinusoidal terms w.r.t. the radial coordinate of the shell have been used rather than Kirchhoff-Love hypothesis. Also the Donnell's ap proximations were used in calculating the strains of the shell.

Calculation of Natural Frequencies of Vibration of Thin Orthotropic Composite Shells by Energy Method

The tribological behavior of polymer coated carbon composites under dry and water lubricating conditions

Improvement of the adhesive peel strength of the secondary barrier with level difference for LNG containment system

Rubber-toughened structural epoxy adhesives are widely used for bonding structures because of their high toughness characteristic. However, the mechanical properties of structural epoxy adhesives degrade much at high environmental temperature, which affects the performance of the adhesive joints severely. Therefore, in this study, the temperature effects on the static and fatigue characteristics of adhesively-bonded tubular single-lap joints were measured. Then the relations between the parameters of S-N curves and the static strength of adhesively-bonded tubular singlelap joints were obtained, from which a fatigue life prediction model for the adhesively-bonded tubular single-lap joints at elevated temperatures was developed.

Dai Gil Lee

Papers

Calculation of Natural Frequencies of Vibration of Thin Orthotropic Composite Shells by Energy Method

The tribological behavior of polymer coated carbon composites under dry and water lubricating conditions

Improvement of the adhesive peel strength of the secondary barrier with level difference for LNG containment system

Temperature effects on the torsional fatigue characteristics of adhesively bonded tubular single-lap joints

Composite rotor for high-speed induction motors