Combining several materials (“phases”) into a composite material permits creation of new materials with tunable overall response, e.g., elastic properties, which can be related to the elastic moduli, arrangement, and concentrations of the composite’s phases. A recent advance predicts use of one phase having correctly tuned non-positive-definite elastic moduli (i.e., negative stiffness) in a two...

The rise in cutting temperatures during the machining process can influence the final quality of the machined part. The impact of cutting temperatures is more critical when machining composite-metal stacks and fiber metal laminates due to the stacking nature of those hybrids which subjects the composite to heat from direct contact with metallic part of the stack and the evacuated hot chips. In ...

Abstract: It is easy for composite laminates to be damaged by relative lower velocity impact which could give rise to internal delamination that will strongly weaken the compressive strength of laminates. In order to predict the occurrence of matrix failure, the elastic-brittle behaviors of fiber-reinforced composites were modeled constitutively by an anisotropic damage model. The dynamic tensi...

A novel low-cost manufacturing process is introduced, referred to as ‘Fabric Steering’. By manipulating biaxial fabrics, curvilinear fibre paths can be created manufacture variable stiffness panels, similar those produced using Automated Fibre Placement [1]. With low equipment costs and the capability steer multiple-layers of fabrics simultaneously, this technique potentially offers faster prod...

The characteristics of carbon fibre reinforced plastics allow a very broad range of uses. Drilling is often necessary to assemble different components, but this can lead to various forms of damage, such as delamination which is the most severe. However, a reduced thrust force can decrease the risk of delamination. In this work, two variables of the drilling process were compared: tool material ...

Rehabilitation of lost dental aesthetic is one of the most important concerns for contemporary dentistry. Conservative treatment modality along with aesthetic approaches, such as direct and indirect laminate veneer restorations were the treatment of choice. Laminate veneers are restorations to correct aesthetic deficiencies and discolorations. Direct laminate veneers involve the application of ...

This experimental research is focused on examining the effects of stress concentration due to the embedded Structural Health Monitoring (SHM) sensors on the structural integrity of glass fiber/epoxy laminates subjected to in-plane tensile loads. Recent advances of health monitoring technologies have resulted in development of micro-dimensional sensors that can be embedded into composite laminat...

This paper deals with the problem of design of composite laminates having zero thermal and hygral expansion and/or curvatures coefficients in one or two directions. The problem is stated as a typical non linear optimization problem in the framework of the polar-genetic approach: the formulation is a function of the laminate polar parameters for the representation of tensor quantities, and a gen...

This work examines the influence of a kerosene flame on residual mechanical tensile properties composite laminates manufactured by thermo-consolidation process from unidirectional (UD) carbon fibers and Polyether Ketone (PEKK) thermoplastic. Considering with two stacking sequences (orthotropic or quasi-isotropic - QI), exposure (116 kW/m2 1100 °C) composites structural integrity was examined as...