Abstract
Inadequate transverse or shear strength is the key factor contributing to the failure of pultruded GFRP structures. In this paper, the static and fatigue performance of 90° pultruded unidirectional GFRP lamina were tested. A series of macroscopic phenomenological models were established to describe the performance variations during cyclic loading, including fatigue life, energy dissipation capacity and cyclic creep strain. The fracture surfaces of specimens were observed by a field-emission scanning electron microscopy (SEM). Experimental results indicated that the transverse fatigue life of GFRP unidirectional lamina can be fitted by S-N-R regression equation. The transverse stiffness degradation can be even ignored during fatigue loading. The results also show that the proposed equations can reasonably reflect the growth trend of dissipated energy per unit volume (UDE) and successfully predict cyclic creep strain increment of pultruded GFRP during cyclic loading.
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