Two‐stage fatigue loading of woven carbon fibre reinforced laminates

Abstract

A brief review of the models used to predict the cumulative fatigue damage in FRP composites is presented. Two-stage fatigue loading of a [0/90,+/- 45(2),0/90](s) quasi-isotropic woven carbon fibre/epoxy resin laminate was evaluated at stress ratio R=0.05 and the failure mechanisms investigated using x-radiography after each loading stage. The results are presented in terms of fatigue strength and damage growth and are compared with those in the literature. A low-to-high loading sequence is more damaging than a high-to-low one and the Palmgren-Miner linear damage rule may no longer be valid for this kind of material, as previously reported

Fatigue performance of RC beams strengthened with CFRP under coupling action of temperatures and vehicle random loads

“…14,15 In this paper, Palmgren-Miner rule, modified Palmgren-Miner rule, and semiempirical fatigue equation were used and discussed in predicting fatigue lives of the specimens. At present, Palmgren-Miner rule, modified Palmgren-Miner rule, Conten-Dolan damage theory, and so on are famous in engineering application.…”

“…14,15 Due to the effects of loading sequence and overloads of random loads and ladder loads, the fatigue performance of materials and structures is different from that under constant amplitude loads. Loading spectrum is a key problem for studies on fatigue performance of the bridge structures under random loads.…”

50th Anniversary Article: Multiaxial Fatigue Testing of Composites: From the Pioneers to Future Directions

“…For the understanding of damage mechanics in these conditions and the development of reliable cumulative damage laws, further investigations are required for clarifying the response of composites laminates under variable amplitude loading, the effects of load sequence and overloads. Some works has been carried out in the past in the case of uniaxial fatigue; see [82][83][84][85][86][87][88][89] and references quoted therein; however, much more is left to do in the case of external multiaxial loading.…”

Progressive damage modelling of 3D fully interlaced woven composite materials

“…delamination and matrix cracking) due to the relatively low fracture toughness of the matrix. These failures make UD composites prone to fatigue and impact. In the last decade, a continuous research effort is ongoing to increase the matrix‐dominated mechanical properties of the composite materials .…”