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NIAR: National Institute for Aviation Research
Recent Submissions
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Effects of thermal plasma on the microstructure and mechanical behavior of alumina-mullite based oxide/oxide ceramic matrix composites
(Elsevier Ltd, 2023-10)Oxide/oxide ceramic matrix composites have potential applications in thermal protection systems due to their ability to withstand very high temperatures while maintaining their load bearing capability and oxidation resistance. ... -
Scaling effects on the strain rate sensitivity of unidirectional and [+45/-45]$_{s}$ laminates under tensile loading
(SAGE Publications Ltd, 2023-08)The effects of geometric scaling on the strain rate sensitivity of unidirectional and [+45/-45]$_{s}$ laminates under uniaxial tensile loading has been investigated experimentally. Two material systems, Toray T800/3900-2B ... -
Characterization approach for compression molded discontinuous fiber thermoplast
(SAMPE, 2023-04)Thermoplastic composites show potential in increasing the manufacturing production rate of composite aerospace structures. This is largely due to their ability to be consolidated quickly using automated processes. A variety ... -
Aerospace structural bonding: Qualification, quality control, substantiation, and risk mitigation
(Woodhead Publishing, 2023)Aviation products widely use metallic and composite structural bonding. Applications include general aviation wings and fuselage splices, rotorcraft blades and airframe stiffeners, transport airplane stiffeners and control ... -
A holistic comparison of a trailing edge rib demonstrator made with three different PEEK thermoplastic composite form factors: unidirectional, fabric and braid
(Vertical Flight Society, 2023-05)This study investigates the forming quality and mechanical performance of a trailing edge rib made with three different carbon fiber PEEK form factors, tape, fabric, and braid. It was found tape ribs developed the most ... -
Multiaxial fatigue damage evaluation of bonded repair and efficient performance evaluation of a composite wing section
(Vertical Flight Society, 2023-05)Technology gaps exist for design and certification of bonded repair of large composite structures under multiaxial loading. They are 1) consideration of delamination failure without including the matrix cracking-induced ... -
Investigation of simulation frameworks for the evaluation of automated flight functions for eVTOL aircraft
(International Council of the Aeronautical Sciences, 2022-09-04)This paper presents the capabilities of a Simcenter-based simulation framework to validate automated flight functions (AFF) for eVTOL aircraft systems. This is accomplished by coupling the modelled aircraft subsystems and ... -
Integration of instance-based learning and computed torque control for an effective assist-as-needed support in human-exoskeleton interaction
(Association for Industry, Engineering and Management Systems (AIEMS), 2022-12)The physiological responses that arise from human-robot interaction may vary across subjects in magnitude and rate. Such individual variations may require instance-based learning over model-based learning algorithms. For ... -
Fatigue damage modeling in laminated composite by using Rx-FEM and strength tracking method
(Elsevier Ltd, 2022-12-01)The durability and residual load carrying capacity of composite materials is of critical importance for increasing their applicability. Regularized eXtended Finite Element Method framework for discrete modeling of damage ... -
Scraping sticky leftovers: App user information left on servers after account deletion
(IEEE, 2022-07-27)Sixty-five percent of mobile apps require user accounts for offering full-fledged functionality. Account information includes private data, e.g., address, phone number, credit card. Our concern is "leftover" account data ... -
Simulation framework for autonomous search and rescue UAVs
(American Institute of Aeronautics and Astronautics, Inc., 2022-06-15)This paper presents the capabilities of the Simcenter-based simulation framework for modeling and validating hybrid autonomous aircraft systems and flight missions. This is accomplished by modeling the drone subsystems in ... -
Experimental and numerical analysis of wrinkles influence on damage mechanisms and strength of L-shape cross-ply composite beams
(Elsevier, 2022-03-28)In this work, experimental and finite element (FE) analysis of L-shape cross-ply fiber-reinforced composite beams are carried out to investigate the effect of out-of-plane wrinkles on the interlaminar strength and competing ... -
A micro-macro coupling and physics informed modeling approach for bearing failure with x-ray CT characterization
(AIAA SCITECH, 2022-01-03)The failure mechanism of composite bolted joints was investigated using an in-situ X-ray CT technique with SSB test. A physics-informed modeling approach was proposed based on the traditional CDM method and a static bearing ... -
Experimental Observations of Damage States in Unnotched and Notched 3D Orthogonal Woven Coupons Loaded in Tension
(American Institute of Aeronautics and Astronautics, 2021-12-29)This paper describes a series of unnotched and notched tensile tests on two 3D orthogonal woven architectures loaded in the warp direction. Dogbone specimens were used for the unnotched tests, and open-hole specimens were ... -
Multiaxial fatigue damage assessment of repaired composite cruciform specimens using stress ratio dependent fatigue damage accumulation model
(American Institute of Aeronautics and Astronautics, Inc., 2021-12-29)The paper presents a combined experimental and numerical study of multiaxial fatigue damage accumulation in scarf-repaired cruciform specimens subjected to fatigue loading. The existing fatigue analysis module is improved ... -
Electroplating polymer based additive manufactured parts for enhanced structural performance
(DEStech Publications, 2021)Additive manufacturing has been adopted in many aerospace and defense applications to reduce weight and buy-to-fly ratios of low-volume high- complexity parts. Polymer-based additive manufacturing processes such as Fused ... -
Induction heating of CF/PEKK laminates using homogenization techniques
(DEStech Publications, 2021)The primary heat generation mechanisms of carbon fiber reinforced thermoplastic laminates during induction heating are joule losses, junction heating with contact resistance and dielectric hysteresis. In relation, these ... -
Fatigue damage modeling in laminated composites by using Rx-FEM and strength tracking method
(DEStech Publications, 2021-09)The durability and residual load carrying capacity of composite materials and structures is of critical importance for increasing their application across the industry. Regularized eXtended Finite Element Method (Rx-FEM) ... -
Skin/stringer interface damage characterization of stiffened composite structures
(DEStech Publications, 2021-09-01)With stiffened composite panels being widely used in aerostructures, critical failure mechanics of the skin/stringer interface need to be thoroughly understood. The interface is design critical and must demonstrate the ... -
Coupon-level mechanical testing for polymer-based additive manufacturing
(ASTM International, 2020-06-04)The term additive manufacturing (AM) is used to describe processes of joining materials to make parts from a three-dimensional model data, as opposed to subtractive manufacturing. Although AM technology offers potential ...
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