Composite Material and Structure

Curing Pressure Duration is a Time needed for applying curing pressure.The formula is given by: Where: t is the duration of curing pressure application. F is the applied force during curing. P is the curing pressure.

Matrix Curing Pressure is a Force applied over contact area.The formula is given by: Where: P is the curing pressure. F is the force applied during curing. A is the contact area between the matrix and any tools or molds used during the curing process.

Interlaminar Fracture Toughness is a Resistance to crack propagation between laminate layers.The formula is given by: Where: KIc​ is the interlaminar fracture toughness. Pc​ is the critical load required to propagate a crack. B is the width of the specimen. h is the thickness of the laminate.

Modal Mass Equation is a Density multiplied by area and thickness.The formula is given by: Where: mmodal is the modal mass. ρ is the density of the composite laminate material. A is the area of the laminate. t is the thickness of the laminate.

Matrix Curing Temperature is a Room temperature plus necessary temperature increment.The formula is given by: Where: Tcure​ is the curing temperature. Troom​ is the room temperature. ΔT is the temperature increment needed for curing.

Critical Fiber Length is a Prevents fiber pullout from matrix interface. The formula is given by: Where: Lcritical​ is the critical fiber length. τinterfacial​ is the interfacial shear strength between the fiber and matrix. τfiber​ is the shear strength of the fiber.

Interfacial Shear Strength is a Force required to shear fiber-matrix interface.The formula is given by: Where: Nf​ is the fatigue life of the composite laminate. A is a constant related to the material and loading conditions. Δε is the applied strain range during cyclic loading.

Fatigue Life is an Inverse proportion to applied strain range.The formula is given by: Where: Nf​ is the fatigue life of the composite laminate. A is a constant related to the material and loading conditions. Δε is the applied strain range during cyclic loading.

Fiber Orientation Angle is an Arctan of fiber orientation vector components.The formula is given by: Where: θ is the fiber orientation angle. X and Y are the respective components of the fiber orientation vector.  

Critical Fiber Volume Fraction is a Minimum fibers to prevent crack propagation.The formula is given by: Where: Vf∗​ is the critical fiber volume fraction. KIC​ is the fracture toughness of the composite material. σf​ is the tensile strength of the fibers. L is the characteristic length associated with crack growth.