Sökning: "Fiber-reinforced composite"
Visar resultat 1 - 5 av 29 avhandlingar innehållade orden Fiber-reinforced composite.
Sammanfattning : Fiber reinforced polymer composites are seeing increased use in the outomotive industry and other applications. This is because of the potential for rational and economical production in large series of complex shaped parts. Properties such as high strength to weight ratio and superior impact properties are of particular interest. LÄS MER
Sammanfattning : The presented thesis contains results of experimental and theoretical studies of the time dependent processes in fiber composites. The first part of the thesis is dedicated to unidirectional fiber reinforced composites. Glass fiber laminates are tested and analyzed. LÄS MER
Sammanfattning : In the present thesis, the sources of linear/non-linear viscoelastic and viscoplastic behaviour in polymer composite materials are under study. The significance of this work is related to the nature of all composite materials. All polymer composites tend to indicate a time-dependent behaviour. This behaviour can be either linear or nonlinear. LÄS MER
Sammanfattning : Predicting micro-damage initiation and evolution is one of the key challenges for safe design of fiber reinforced polymer composites. Micro-scale damage such as, for example, single fiber break may be unnoticeable and negligible during the initial service life of composite, however, with many loading and unloading cycles this initially micro-scale damage may propagate forming macroscopic scale cracks that can significantly reduce the service lifetime or even lead to unforeseen catastrophic failure of the composite structure. LÄS MER
Sammanfattning : When a unidirectional (UD) fiber reinforced polymer composite is loaded in fiber direction in quasi-static or in a high stress cyclic tension-tension regime, many fiber breaks may occur in random positions already during the load increase in the first cycle. This is because fiber strain to failure in UD composites is lower than the polymer matrix strain to failure. LÄS MER