Standard Test Method for Mode I Fatigue Delamination Growth Onset of Unidirectional Fiber-Reinforced Polymer Matrix Composites

Importancia y uso:

5.1 Susceptibility to delamination is one of the major weaknesses of many advanced laminated composite structures. Knowledge of a laminated composite material's resistance to interlaminar fracture under fatigue loads is useful for product development and material selection. Furthermore, a measurement of the relationship of the mode I cyclic strain energy release rate and the number of cycles to delamination growth onset, G–N, that is independent of specimen geometry or method of load introduction, is useful for establishing design allowables used in damage tolerance analyses of composite structures made from these materials.

5.2 This test method can serve the following purposes:

5.2.1 To establish quantitatively the effects of fiber surface treatment, local variations in fiber volume fraction, and processing and environmental variables on G–N of a particular composite material.

5.2.2 To compare quantitatively the relative values of G–N for composite materials with different constituents.

5.2.3 To develop criteria for avoiding the onset of delamination growth under fatigue loading for composite damage tolerance and durability analyses.

Subcomité:

D30.06

Referida por:

D6856_D6856M-23, D4762-23

Volúmen:

15.03

Número ICS:

83.120 (Reinforced plastics)

Palabras clave:

composite materials; delamination; double cantilever beam; frequency; maximum cyclic strain energy release rate; mode I; onset of fatigue delamination growth;