What factors influence the final properties of composites? The reconfiguration of the composite structure depends on many parameters, such as the
material properties, lay up sequence, fiber orientation, thickness, and the strategic position of laminae with different orientations
.
Which of the following may alter the fibre properties of reinforced composites?
6. Which of the following may alter the mechanical properties of reinforced composites? Explanation:
Constituent properties, fiber length
etc affect the overall property of reinforced composites.
What fiber factors contribute to the mechanical performance of a composite?
R
Length, orientation, and shape
all contribute to the mechanical performance of a composite .
What determines the properties of a material?
The mechanical and physical properties of materials are determined by
their chemical composition and their internal structure
, like grain size or crystal structure. Mechanical properties may be greatly affected by processing due to the rearrangement of the internal structure.
What are the major properties of composite materials and what are the major types of composite materials?
Key among them are
strength, lightweight, corrosion resistance, design flexibility, and durability
. Strong. Per pound, composites are stronger than other materials such as steel. The two primary components of composites – fibers and resins – contribute to their strength.
Composite materials composed of
at least two constituents of different phase
, in order to achieve combined properties that cannot be met by a single-phase material, and it can be classified in three subclasses, including particles, fibers, and structural based composites (Fig.
“Material degradation” is
the causing of, or contribution to, the extended or widespread impairment of the condition or usage of a natural resource
.
Composites are simply a combination of two or more constituent materials with different physical or chemical properties. When combined, they produce a material with characteristics different from their original properties. The two main components within a composite are the
matrix and fiber
.
Classification of composite materials occurs at two different levels: The first criterion of classification is based on the matrix (binder) constituent. The main composite families encompass
organic matrix composites (OMCs), metal matrix composites (MMCs), and ceramic matrix composites (CMCs)
.
Organic, polymeric or Reinforced
-Plastics matrix composite materials.
Mechanical properties of composite materials A composite material incorporates high strength, high modulus fibers in a matrix (polymer, metal, or ceramic). The fibers may be oriented in a manner to give varying in-plane properties (
longitudinal, transverse-stress, strain, and modulus of elasticity
).
One simple scheme for the classification of composite materials is shown in Figure 16.2, which consists of three main divisions:
particle-reinforced, fiber-reinforced, and structural composites
; also, at least two subdivisions exist for each.
The chemical composition of engineering material indicates the elements which are combined together to form that material. Chemical composition of a material effects the properties of engineering materials very much.
The strength, hardness, ductility, brittleness, corrosion resistance, weldability
etc.
Bond Force determines the elastic modulus (or Young’s modulus) of a material (how stiff a material is)
. Similarly, stronger bonds will enable a material to withstand higher temperatures before the bonds break and the material melts or softens.
A composite material
consists of two or more materials with different properties
. They are combined to produce a material with improved properties. Most composite materials have two components: the reinforcement. the matrix , which binds the reinforcement together.
A method is described for the optimal selection of composite materials based on: performance indices to define material performance, materials selection charts on to which the material properties and performance indices can be plotted and the use of bounds to define the envelope of properties accessible to a particular …
There are several factors that influence the overall rate of degradation, in addition to
pH and copolymer composition
. In general, polymer degradation is accelerated by greater hydrophilicity in the backbone or end groups, lesser crystallinity, lower average molecular weight, and smaller size of the finished device.
Corrosion or degradation involves
deterioration of material when exposed to an environment resulting in the loss of that material
, the most common case being the corrosion of metals and steel by water.
Material degradation occurs by the process of
corrosion and oxidation in wet and dry environments
, respectively. In addition, the third form of damage is degradation of material due to metallurgical changes.
