A vacuum bagging diaphragm assembly used in forming a component from composite material includes a first sheet of a first material. Also included is a second sheet of a second material for positioning between a three dimensional forming tool and the first sheet. A modulus of elasticity of the second material is greater than a modulus of elasticity of the first material. A method includes a step of positioning a composite laminate material between a first sheet of a first material and a second sheet of a second material. The second material has a modulus of elasticity greater than a modulus of elasticity of the first material. The method further includes a step of positioning the second material of the second sheet in overlying relationship to a three dimensional forming tool with the second material positioned between the three dimensional forming tool and the composite material.