Jos Sinke - Academia.edu (original) (raw)

Papers by Jos Sinke

The development of fiber metal laminates to multi-functional materials by embedding heater elemen... more The development of fiber metal laminates to multi-functional materials by embedding heater elements in the laminate extends their field of application. Fiber metal laminates with embedded heater elements are likely to be used for the de- and anti-icing of leading edges in aircraft as they combine structural and heating functions. Hence, those heated fiber metal laminates are exposed to frequent temperature changes when the de- or anti-icing devices are switched on. In order to examine the possible effects of thermal fatigue loading on the material characteristics, a thermal cycling setup was developed. The experimental setup has the ability to perform thermal cycling tests of materials with and without embedded heater elements. For structural materials, the thermal cycling setup provides external cooling and external heating using Peltier elements. For multi-functional materials (materials with embedded heater elements), the experimental setup enables thermal cycling tests by provid...

Gaps in pre-preg plies, in a case when adjacent plies do not align perfectly, may represent a sig... more Gaps in pre-preg plies, in a case when adjacent plies do not align perfectly, may represent a significant issue in an automated fibre placement manufacturing process and can be detrimental to the properties of the final laminates. In order to tackle the consequences of gaps in the composite material, a comprehensive research has to be performed. Starting from existing manufacturing processes, the effects of gaps were investigated in different ways, including the first indication of their impact on the mechanical properties. The focus of this paper is to extend the state of the art in gaps in composite materials to hybrid composite materials such as Glare, a member of Fibre Metal Laminates (FMLs). The investigation started with the manufacturing of Glare specimens having gaps with different widths, followed by a non-destructive ultrasonic inspection. Also, an optical evaluation of the gaps was performed by microscope image analysis of the cross sections of the specimens. Results from...

Journal of Composite Materials, 2020

The paper addresses the role played by the cure stage of a vacuum assisted resin transfer molding... more The paper addresses the role played by the cure stage of a vacuum assisted resin transfer molding process in residual stresses generation. The Airstone 780E epoxy resin and Hardener 785H system broadly used in the wind turbine blade industry has been used in this study. The viscous–elastic properties of the resin have been characterized and implemented in a thermo-mechanical FE model. The model has been validated against manufactured [0/90]4 asymmetric laminates. Analysis of residual stresses generation highlighted that compressive stresses generation occurs when the cure is shrinkage dominated and tensile stresses when expansion dominated in the 0° plies. The finding points out that 10% reduction in warpage and 33% reduction in process time can be obtained by selecting cure cycle parameters that allow tensile stresses development during the cure process in the 0° plies.

Nondestructive Testing and Evaluation, 2019

Composites Part A: Applied Science and Manufacturing, 2018

Composite Structures, 2018

Composite Structures, 2017

Journal of Composite Materials, 2017

Autoclave manufacturing of fibre metal laminates, such as GLARE, is an expensive process. Therefo... more Autoclave manufacturing of fibre metal laminates, such as GLARE, is an expensive process. Therefore, there is an increasing interest to find cost-effective out-of-autoclave manufacturing processes without diminishing the laminate quality. The aim of this study is to evaluate the quality of fibre metal laminate panels adhesively bonded and cured using resistance heating. Three manufacturing processes are compared for different layups with an embedded steel mesh at the mid-plane: autoclave curing, resistance bonding of two (autoclave-cured) panels and complete out-of-autoclave resistance curing of panels. Interlaminar shear strength tests and optical microscopy analysis showed that resistance bonding is a promising technique, leading to results comparable to autoclave curing. Resistance curing led to an interlaminar shear strength decrease of 30–60%. A study of the correlation between degree of cure and distance from the mesh revealed the potential of resistance bonding to be used for...