R.D.R. Sitohang
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View article: On the thickness and layup dependence on failure mechanisms during unfolding of curved woven composites
On the thickness and layup dependence on failure mechanisms during unfolding of curved woven composites Open
This study investigates the failure mechanisms of curved woven Glass/Polyphenylene sulfide (G/PPS) composites and characterizes the critical strains associated with the occurrence of damages during unfolding. Tensile-bending tests were car…
View article: DESIGN METHODOLOGY OF A COMPOSITE SHEAR RESISTANT FLEXURE FOR A MORPHING STRUCTURE
DESIGN METHODOLOGY OF A COMPOSITE SHEAR RESISTANT FLEXURE FOR A MORPHING STRUCTURE Open
This paper reports on the methodology behind the development of fiber reinforced thermoplastic flexures meant for a movable morphing application.A concept using a flexible skin and these so-called Shear Resistant Flexure (SRF) connect a fi…
View article: The relation between in-plane fiber waviness severity and first ply failure in thermoplastic composite laminates
The relation between in-plane fiber waviness severity and first ply failure in thermoplastic composite laminates Open
The influence of in-plane fiber waviness on the first ply failure of quasi-isotropic thermoplastic composite laminates was investigated. The failure mode and stress at first failure were studied by using a four-point bending test and an en…
View article: Effect of in-plane waviness defects on compressive failure of thermoplastic composite laminates
Effect of in-plane waviness defects on compressive failure of thermoplastic composite laminates Open
Defect-free manufacturing of parts and structures based on advanced materials can be challenging. Thermoplastic composites form no exception. In particular, process-induced in-plane fiber waviness is worrisome as it is often difficult to p…
View article: An experimental approach to reproduce in-plane fiber waviness in thermoplastic composites test coupons using a reverse forming method
An experimental approach to reproduce in-plane fiber waviness in thermoplastic composites test coupons using a reverse forming method Open
In-plane fiber waviness is one of the defects that can occur from the stamp-forming process of thermoplastic composite (TPC) parts. The influence of this defect on the mechanical performance of multidirectional composites is not yet fully …
View article: Effect of in-plane fiber waviness defects on the compressive properties of quasi-isotropic thermoplastic composites
Effect of in-plane fiber waviness defects on the compressive properties of quasi-isotropic thermoplastic composites Open
The influence of in-plane fiber waviness defects on the compressive properties of quasi-isotropic (QI) carbon polyether-ether-ketone (C/PEEK) composites was investigated experimentally. Specimens with localized waviness were manufactured u…
View article: The Fabrication of Yam Bean (Pachyrizous erosus) Starch based Bioplastics
The Fabrication of Yam Bean (Pachyrizous erosus) Starch based Bioplastics Open
Bioplastics, easily degraded plastics made from renewable biopolymers such as starch and protein, are being studied as possible substitute for synthetic plastics. One of Indonesian natural resources, Jicama (Pachyrizous erosus), also known…
View article: Water absorption and tensile strength degradation of Petung bamboo (<i>Dendrocalamus asper</i>) fiber—reinforced polymeric composites
Water absorption and tensile strength degradation of Petung bamboo (<i>Dendrocalamus asper</i>) fiber—reinforced polymeric composites Open
Bamboo fibers have attracted great interest and are believed to have the potential as natural fiber for reinforcing polymer composites. This research aims to study water absorption behavior and its effect to tensile strength of the composi…
View article: Water absorption and its effect on the tensile properties of tapioca starch/polyvinyl alcohol bioplastics
Water absorption and its effect on the tensile properties of tapioca starch/polyvinyl alcohol bioplastics Open
Tapioca is one of the largest sources of starch and makes it suitable to be used for bioplastic material. Addition of polyvinyl alcohol (PVA) has been shown to successfully reduce the brittleness of starch bioplastic. This study aims to in…