Types of matrix in composite materials
Composite materials have matrix (or resins) which is a polymer that has the function to bond all the fibers together.
Sandwich constructions in composite materials
Sandwich construction in composite materials is used to obtain a high specific bending stiffness in comparison to monolithic laminate.
Rule of mixtures in composite materials
To obtain the mechanical properties of composite materials, due to its anisotropic properties, it is necessary to use the rule of mixtures.
What is the Laminate Stacking Sequence (LSS)?
Laminate mechanical properties are defined by factors such as ply number, thickness, material, orientation, and sequence. Common types include unidirectional, angle-ply, cross-ply, balanced, symmetric, antisymmetric, and quasi-isotropic laminates, each with unique characteristics.
Optimum laminate design in composite materials
Composite structure design aims for failure tolerance, involving material selection, fiber orientation, laminate stacking, and ply number for strength and stiffness optimization.
Fatigue failure in composite materials
Fatigue in composite materials, prevalent in aerospace and automotive industries, is influenced by mechanical properties, loads, cycles, and environmental conditions. Testing for stiffness reduction without failure is essential for understanding damage progression, which culminates in material fracture due to tensile stress.
Failure criteria in composite materials
Composite material failure criteria vary, with no consensus among designers. Main types are dependent and not dependent failure modes, each with specific theories and limitations.
Theory of vibration
Structural buckling is an out-of-plane deflection under compression, with advanced composites showing various instability forms. Buckling load is calculated using Euler's equation, considering material properties and component dimensions.
Types of inserts used in composite materials laminates
Inserts enhance sandwich panel strength and stiffness, distributing localized loads via materials like metals and contributing differently across tension, compression, shear, bending, and torsion. Four insert types exist for varying load conditions.
Types of defects in composite materials
Structural analysis often assumes ideal conditions, ignoring real-life manufacturing defects that affect component behavior. Engineers must consider various defects in composites, such as delamination and cracks, during design and quality control stages.