S. T. Pinho

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Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA Scientific and Technical Information (STI) Program Office plays a key part in helping NASA maintain this important role. The NASA STI Program Office is operated by Langley Research Center, the lead center for NASA's scientific and technical information.(More)
Both environmental and economic factors have driven the development of recycling routes for the increasing amount of carbon fibre reinforced polymer (CFRP) waste generated. This paper presents a review of the current status and outlook of CFRP recycling operations, focusing on state-of-the-art fibre reclamation and re-manufacturing processes, and on the(More)
The initiation and propagation of kink–bands are investigated through an experimental study and numerical modelling. Based on the results achieved, the sequence of events and key features for kink–band formation are identified; particularly, matrix yielding is found to play a crucial role in the process, and fibres are found to fail in the compressive side(More)
Modelling the longitudinal compressive failure of carbon-fibre-reinforced composites has been attempted for decades. Despite many developments, no single model has surfaced to provide simultaneously a definitive explanation for the micromechanics of failure as well as validated predictions for a generic stress state. This paper explores the reasons for(More)
INTRODUCTION Kink-bands are common features encountered in longitudinal compressive failure of carbon/epoxy systems. Their understanding and modelling have been an active field of research for the last four decades. This task has proven to be challenging due to both the difficulty in obtaining experimental evidence of the details of their formation and the(More)
— For composite structure, fracture toughness is a dominant parameter when using cohesive laws to predict the nominal strength. In the present study the compact tension test is performed on composites structures and is simulated using FEM. The process of fracture takes places in two sequential stages, crack initiation and crack propagation. The critical(More)
INTRODUCTION This paper describes a constitutive and failure model for composite laminates under 3D stress states, for which the contribution of the hydrostatic pressure is not negligible. While many previous publications in the area have focused on plane stress, real applications of composite structures typically involve 3D stress states. The out-of-plane(More)
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