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Item type:Publication, Access status: without files , Influence of pin size on tensile and fatigue behavior of TI-CFRP hybrid structures produced by laser additive manufacturingThis paper contains mechanical investigations of metallic fabric-penetrating interfaces produced by powder-bed-based laser additive manufacturing and vacuum-assisted resin transfer moulding. Therefore, different fabric penetrations (pins) have been created which vary in length. These penetrative interfaces have been studied in quasi-static tensile (shear) tests and fatigue tests. Deformation and damage processes were determined during tensile and fatigue loading by measurement of the local strain distribution, utilizing a 3D-digital image correlation (DIC) system. Additionally, light microscopic and scanning electron microscopic (SEM) investigations were carried out in order to assess the damage mechanisms and fracture surfaces. The quasi-static tests revealed that tensile shear strength increased by 503 % compared to solely adhesive interface, due to the integration of long pins. Furthermore, different pin-size-depending failure mechanisms have been detected. The fatigue tests showed, that fabric penetration also improves the fatigue strength significantly by 246 %, whereby the damage mechanisms change in comparison to quasi-static failure.Publicationtype: Conference Paper105 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Effects of defects in laser additive manufactured Ti-6Al-4V on fatigue propertiesLaser Additive Manufacturing (LAM) enables economical production of complex lightweight structures as well as patient individual implants. Due to these possibilities the additive manufacturing technology gains increasing importance in the aircraft and the medical industry. Yet these industries obtain high quality standards and demand predictability of material properties for static and dynamic load cases. However, especially fatigue and crack propagation properties are not sufficiently determined. Therefore this paper presents an analysis and simulation of crack propagation behavior considering Laser Additive Manufacturing specific defects, such as porosity and surface roughness. For the mechanical characterization of laser additive manufactured titanium alloy Ti-6Al-4V, crack propagation rates are experimentally determined and used for an analytical modeling and simulation of fatigue. Using experimental results from HCF tests and simulated data, the fatigue and crack resistance performance is analyzed considering material specific defects and surface roughness. The accumulated results enable the reliable prediction of the defects influence on fatigue life of laser additive manufactured titanium components.Publicationtype: Journal ArticleScopus© Citations 402 249 367