Lothar Kroll
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Load-Dedicated Fiber Reinforcement of Additively Manufactured Lightweight Structures Open
This study focuses on a novel lightweight technology for manufacturing variable-axial fiber-reinforced polymer components. In the presented approach, channels following the load flow are implemented in an additively manufactured basic stru…
Sustainable PLA Composites Filled with Poaceae Fibers: Thermal, Structural, and Mechanical Properties Open
The present study investigates the manufacturing and characterization of poly(lactic acid) (PLA)-based composites with raw and treated Poaceae, with loadings of 5, 10, and 20% wt. Before composite fabrication, the lignocellulosic fillers w…
Organosilicon Hybrid Materials Derived From Epoxide‐Functionalized Twin Monomers: Novel Adhesion Promoters for Composites Open
The synthesis and characterization of epoxide‐functionalized twin monomers is reported, comprising glycidyl ether and epoxycyclohexane derivatives of 4H‐1,3,2‐benzodioxasiline. The thermal properties of the monomers were studied by differe…
Protection of concrete against corrosion caused by the reaction of sodium and potassium hydroxides with silica Open
Prevention of the reaction of sodium and potassium hydroxides with silica [alkali-silica reaction – ASR] in concrete can be shaped by: using non-reactive aggregate, ensuring a low content of sodium and potassium oxides in the concrete mix,…
A New CDM-Based Approach for the Nonlinear Numerical Structural Analysis of Flax Fiber Reinforced Plastic Open
Fibre-reinforced polymers based on natural fibers, such as flax fibers, exhibit pronounced nonlinear orthotropic material behavior. This presents a significant challenge in finite element analysis (FEA) simulations, as the nonlinear consti…
View article: Reduction of fluid noise in modern aircraft hydraulics by integrated broadband attenuators
Reduction of fluid noise in modern aircraft hydraulics by integrated broadband attenuators Open
New axial piston pumps with fixed displacement volumes, such as the high efficient power package (HEPP) pumps operate at variable rotational speeds and thus variable flow rates in a wide range. Using intelligent pump control systems, small…
Impact compressive properties of polyurethane foams with 3D continuous fibre reinforcement Open
Flexible and rigid polyurethane foams are used in applications subjected to impact loads. Integrating a three-dimensional, continuous fibre reinforcement meets high requirements for stiffness and strength. A fundamental comparison of the i…
Integration of sensors during laser powder bed fusion Open
Laser powder bed fusion (PBF‐LB/M) is an additive manufacturing (AM) process to produce high‐strength, functionally integrated, lightweight metal components which cannot be built conventionally. This article addresses the expansion of func…
Quality-Driven Allocation Method to Promote the Circular Economy for Plastic Components in the Automotive Industry Open
In recent years, the development of a circular economy of plastic products in the automotive industry has been pursued by original equipment manufacturers (OEMs) not only due to strategic premises by the European Commission but also due to…
Development and Evaluation of a Novel Method for Reinforcing Additively Manufactured Polymer Structures with Continuous Fiber Composites Open
Additively manufactured polymer structures often exhibit strong anisotropies due to their layered composition. Although existing methods in additive manufacturing (AM) for improving the mechanical properties are available, they usually do …
Additive manufacturing of short fiber oxide ceramic matrix composite: Process analysis and material properties Open
This work investigates the material extrusion‐based additive manufacturing (AM) process chain of a pure alumina‐based oxide ceramic matrix composite, starting from material selection, large‐scale compounding to pellets, the AM process itse…
Influence of sodium hydroxide, silane, and siloxane treatments on the moisture sensitivity and mechanical properties of flax fiber composites Open
Natural fibers are a sustainable alternative to synthetic fibers due to their high weight‐specific Young's moduli and strengths. However, the mechanical properties of natural fibers are very sensitive to their moisture content. Therefore, …
Impact Localization for Haptic Input Devices Using Hybrid Laminates with Sensoric Function Open
The required energy savings can be achieved in all automotive domains through weight savings and the merging of manufacturing processes in production. This fact is taken into account through functional integration in lightweight materials …
Effects of Process Parameters in Thermoforming of Unidirectional Fibre-Reinforced Thermoplastics Open
Process-induced defects during thermoforming are widespread problems in laminate manufacturing. The aim of this study is to describe the effects of holding time and pressure on several properties of the manufactured laminate. A design of e…
Designing bended pipes under internal pressure Open
There are major benefits, e.g. in the aerospace sector, for lightweight mobile applications, because of integral lightweight design and construction. Integral lightweight design avoids parting points, as they increase the weight and at the…
Analytical modelling of continuous fibre-reinforced thermoplastics’ thermomechanical properties and implementation into a failure model Open
Mechanical properties of fibre-reinforced thermoplastics show a remarkable temperature dependence within application temperatures of automotive and aerospace lightweight structures. To take this dependence into account when designing compo…
Technology fusion of metal injection moulding and selective laser melting for the manufacture of complex and multifunctional (hydraulic) components Open
Selective laser melting (SLM) and metallic injection moulding (MIM) are established processes for the production of high-performance metallic components for small and large series. In the aerospace industry, where very high demands are pla…
Fatigue behaviour of material-adapted fibre-reinforced polymer/metal joints Open
By regarding the needs and requirements in modern multi-material joining, the Flow Drill Joining Concept (FDJ) was developed at the Chemnitz University of Technology. The technology allows an efficient and material-adapted joining of thin …
Radar sensor integration and quality testing of sheet moulding compound parts in the automotive frequency range Open
Sheet moulding compounds (SMC), a type of fiber-reinforced polymers with discontinuous fibers, are a highly used lightweight material due to their cost efficiency and processability. Since the use of radar sensors behind structural skin bo…
Integration of RFID tag in additive manufactured parts Open
This paper discusses the integration of on-metal tags in additively manufactured Ti-6Al-4V geometries. The manufactured components are to be equipped with information and read out due to aircraft maintenance work. Due to the complex instal…
Simulative Design of a Load-Path Adapted Fibre Reinforced Composite (FRP) Transporter Rear Door Open
The demand for weight reduction in the automotive, aerospace, and railway industries is at an all-time high. Fibre-reinforced composites (FRC) have proved their suitability with their excellent combination of strength and weight. The only …
Investigation of material degradation during multiple recycling loops of a glass fiber reinforced polypropylene compound to evaluate life cycle analysis based on mechanical properties Open
In order to reduce the global warming potential of their vehicles, automotive manufacturers are increasingly striving to use recyclates. However, recyclates often have weaker mechanical properties than comparable virgin polymers. Structura…
Experimental investigation of automotive component in hybrid fibre reinforced thermoplastic design Open
A tailored use of continuous fibre reinforced plastics enables application in high volume car body structures. The combination of pultruded, load carrying, unidirectional, continuous fibre reinforced thermoplastic (FRTP) profiles and injec…
Effects of Process Parameters in Thermoforming of Unidirectional Fibre-Reinforced Thermoplastics Open
Process induced defects during thermoforming are widespread problems in laminate manufacturing. The aim of this study is to describe the effects of holding time and pressure on several properties of the manufactured laminate. A design of e…
Influence of Carbon on Additively Manufactured Ti-6Al-4V Open
In this study, the Ti-6Al-4V powder material for additive manufacturing was mixed with amorphous carbon and processed by powder bed fusion using a laser beam. The specimens were subjected to mechanical and microstructural analyses to inves…
Combining Pultrusion with Carbonization: Process Analysis and Material Properties of CFRP and C/C Open
Composites made of carbon-fiber-reinforced carbon (C/C or CFC) are high-performance materials with a wide range of properties, making them especially suitable for the design of thermally and mechanically highly stressed components. As the …
Effect of organic impurity in additive manufactured Ti-6Al-4V Open
In this study, the influences of organic impurities on the additively manufactured Ti-6Al-4V material were analyzed. For this purpose, common foreign particles, as they can occur along the powder process chain, were inserted into the selec…