Composite Materials as a Basis for Generating Optimal Topologies in Shape Design

Rational cross-sectional design and behavioural analysis of the low-sag stressed ribbon pedestrian bridges/Rationale Querschnittsbemessung und Verhaltensanalyse der Fußgänger-Spannbandbrücken mit geringem Durchhang

Bauingenieur ◽

10.37544/0005-6650-2021-04-57 ◽

2021 ◽

Vol 96 (04) ◽

pp. 121-131

Author(s):

Vilius Kleinas

Keyword(s):

Composite Materials ◽

Cross Section ◽

Shape Design ◽

Cross Sectional ◽

Behavioural Analysis ◽

Pedestrian Bridges ◽

Ribbon Structure ◽

Cross Sectional Design

Stress ribbon bridges represent one of the simplest and the most efficient modern bridge constructions used in modern lightweight pedestrian bridges. The article presents an analysis of the stress ribbon bridge behaviour by applying different values of constant loads, assessing the possibilities of using steels and composite materials. The article presents the methodology for the rational cross-section and shape design of the low-sag stressed ribbon structure, based on the rigidity conditions. The article discusses the structure‘s behaviour in asymmetric loads and provides recommendations for Design.

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Comparative Microstructures of Ion Milled and Electrochemically Thinned Composite Materials

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052742 ◽

1974 ◽

Vol 32 ◽

pp. 546-547

Author(s):

R.R. Russell

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Composite Materials ◽

Great Difficulty ◽

Ion Milling ◽

Transmission Electron ◽

Ion Damage ◽

Intermetallic Composite

Transmission electron microscopy of metallic/intermetallic composite materials is most challenging since the microscopist typically has great difficulty preparing specimens with uniform electron thin areas in adjacent phases. The application of ion milling for thinning foils from such materials has been quite effective. Although composite specimens prepared by ion milling have yielded much microstructural information, this technique has some inherent drawbacks such as the possible generation of ion damage near sample surfaces.

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Transmission electron microscopy of composite materials

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100107125 ◽

1988 ◽

Vol 46 ◽

pp. 1012-1015

Author(s):

K.P.D. Lagerlof

Keyword(s):

Composite Materials ◽

Physical Properties ◽

Structural Defects ◽

Structural Composites ◽

Multiphase Materials ◽

Structural Reinforcement ◽

Transmission Electron ◽

Reinforced Fiber ◽

Particulate Reinforced Composites ◽

Definition Of

Although most materials contain more than one phase, and thus are multiphase materials, the definition of composite materials is commonly used to describe those materials containing more than one phase deliberately added to obtain certain desired physical properties. Composite materials are often classified according to their application, i.e. structural composites and electronic composites, but may also be classified according to the type of compounds making up the composite, i.e. metal/ceramic, ceramic/ceramie and metal/semiconductor composites. For structural composites it is also common to refer to the type of structural reinforcement; whisker-reinforced, fiber-reinforced, or particulate reinforced composites [1-4].For all types of composite materials, it is of fundamental importance to understand the relationship between the microstructure and the observed physical properties, and it is therefore vital to properly characterize the microstructure. The interfaces separating the different phases comprising the composite are of particular interest to understand. In structural composites the interface is often the weakest part, where fracture will nucleate, and in electronic composites structural defects at or near the interface will affect the critical electronic properties.

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