Abstract
The mechanical properties of plastic-based additively manufactured specimens have been widely discussed. However, there is still no standard that can be used to determine properties such as the interfacial strength of adjacent tracks and also to exclude the influence of varying manufacturing conditions. In this paper, a proposal is made to determine the interfacial strength using specimens with only one track within a layer. For this purpose, so-called single-wall specimens of polylactide were characterised under tensile load and the interfacial area between the adjacent layers was determined using three methods. It turned out that the determination of the interfacial area via the fracture surface is the most accurate method for determining the interfacial strength. The measured interfacial strengths were compared with the bulk material strength and it was found that the bulk material strength can be achieved under optimal conditions in the FFF process. It was also observed that with increasing nozzle temperature, the simultaneous printing of specimens influences the interfacial strength. To conclude, this method allows to measure the interfacial strength without superimposing the influence of voids. However, for example, the interfacial strength within a layer cannot be determined.
Highlights
IntroductionIntroduction and motivationAdditive manufacturing has its origin in the so-called rapid prototyping, a technique used to create realistic models of components without the need of manufacturing tools
Introduction and motivationAdditive manufacturing has its origin in the so-called rapid prototyping, a technique used to create realistic models of components without the need of manufacturing tools
If the significance is determined within all groups of 190 °C and 210 °C and a cooling time higher 9.2s, no significant influence can be found for the interfacial
Summary
Introduction and motivationAdditive manufacturing has its origin in the so-called rapid prototyping, a technique used to create realistic models of components without the need of manufacturing tools. 3D printers for polymers are available and additive manufacturing has become a widely used production technique. The market and the quality, the mechanical properties and the reliability of additive manufactured structures have grown. Mechanical properties of polymers manufactured by additive manufacturing have widely been discussed. Several parameters are believed to have an effect on the mechanical properties and many have been evaluated scientifically: manufactured structures containing more than a single deposited track will inevitably form voids between individual tracks due to the round geometry of the tracks. Size and nature of these voids will affect stiffness and strength of the printed polymer.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
