Composite Material and Structure

Impact Resistance is a Maximum load per unit area during impact.The formula is given by: Where: IR​ is the impact resistance. Wmax​ is the maximum load experienced during impact. A is the area over which the load is applied.

Curing Pressure Rate is a Change in pressure per unit time.The formula is given by: Where: R is the curing pressure rate. ΔP is the change in curing pressure. Δt is the corresponding change in time.

Curing Pressure Profile is a Pressure variation over curing time.The formula is given by: Where: P(t) is the curing pressure at time t. P0​ is the initial curing pressure. R is the rate of change of curing pressure over time.

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.