Constitutive equation for unidirectional composites under tensile impact

An experimental study on the behavior of glass–epoxy composite at low strain rates

“…Some claimed that the tension velocity did not significantly affect the strength and stiffness of some PMCs [5,[7][8][9], whereas the other reported certain influences of strain rate on the mechanical properties of this type of composite materials [2][3][4][10][11][12][13][14][15]. However, in the latter case, the experimental findings did not represent the same trends.…”

“…Despite some investigators [3,4,[10][11][12][13] that concluded the strength and Young's modulus of some FRPs increased by any increase in strain rate, some researchers showed that any increase in tension velocity might decrease the tensile strength and stiffness of these composites [2,14,15]. Although these inconsistencies might be due to differences in matrix and reinforcement, test conditions, type and preparation of the test samples and the experimental equipments and procedures, they quiet imply the complex nature of rate dependency of PMCs.…”

Strain rate effects in phenolic composites and phenolic-impregnated honeycomb structures

“…This effect is typical for glass fibre reinforced plastics, while the failure strain remains nearly constant for carbon fibre reinforced plastics and decreases for aramid fibre reinforced plastics [33][34][35]. The Young's modulus also seems to increase marginally according to Fig.…”

A tensile impact apparatus for characterization of fibrous composites at high strain rates

“…The results given by Barre et al [10] suggest that the failure stress for some kind of glass/epoxy composites increase up to 300% with the increase of strain rate. Yuanming and Xing [11] established constitutive relations between elastic modulus and strain rate on one hand and stress and strain rate on the other hand. They obtained their results using bimodal Weibull distribution verified by test data.…”