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Fig. 1. Ply fracture planes considered in the model. Experimental results have shown that moderate values of transverse compression have a beneficial effect on the strength of a ply (Soden et al., 1998): when the in-plane shear stress is large compared o the transverse compressive stress, the fracture plane is perpendicular to the mid-plane of the ply. However, increasing the compressive transverse stress causes a change in the angle of the fracture plane. Normally, for carbon—epoxy and glass—epoxy composites loaded in pure transverse compression, he fracture plane is at an angle (fracture angle, a) of 53° + 3° with respect to the thickness direc- ion (Puck and Schtiirmann, 1998). Therefore, matrix cracking does not occur in the plane of the maximum transverse shear stress (45°).

Figure 1 Ply fracture planes considered in the model. Experimental results have shown that moderate values of transverse compression have a beneficial effect on the strength of a ply (Soden et al., 1998): when the in-plane shear stress is large compared o the transverse compressive stress, the fracture plane is perpendicular to the mid-plane of the ply. However, increasing the compressive transverse stress causes a change in the angle of the fracture plane. Normally, for carbon—epoxy and glass—epoxy composites loaded in pure transverse compression, he fracture plane is at an angle (fracture angle, a) of 53° + 3° with respect to the thickness direc- ion (Puck and Schtiirmann, 1998). Therefore, matrix cracking does not occur in the plane of the maximum transverse shear stress (45°).

Related Figures (4)

The lamina compliance tensor can be represented in Voigt notation as: The closure of transverse cracks under load reversal, also known as the unilateral effect, is taken into ac- count by defining four damage variables associated with longitudinal and transverse damage. To deter- mine the active damage variables, it is necessary to define the longitudinal and transverse damage modes as follows:
The lamina compliance tensor can be represented in Voigt notation as: The closure of transverse cracks under load reversal, also known as the unilateral effect, is taken into ac- count by defining four damage variables associated with longitudinal and transverse damage. To deter- mine the active damage variables, it is necessary to define the longitudinal and transverse damage modes as follows:
Fig. 2. Elastic domain in the 61,, G2, G2 space.
Fig. 2. Elastic domain in the 61,, G2, G2 space.
Fig. 3. Evolution of elastic domain in the G2)—d)2 space. Therefore, the condition of positive evolution of damage variables (dj > 0) is a sufficient condition Ne lONEWUaIMal GdaMape aCllVallONn LUNCUON Is modified by taking into account that under shear dominated loads, matrix cracking is the first form
Fig. 3. Evolution of elastic domain in the G2)—d)2 space. Therefore, the condition of positive evolution of damage variables (dj > 0) is a sufficient condition Ne lONEWUaIMal GdaMape aCllVallONn LUNCUON Is modified by taking into account that under shear dominated loads, matrix cracking is the first form
Related topics:
Materials EngineeringMechanical EngineeringCivil EngineeringMechanics of MaterialsFiber Reinforced PlasticContinuum Damage MechanicsFracture MechanicConstitutive modelFailure Mechanism
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