Browsing NIAR: National Institute for Aviation Research by Title
Now showing items 29-48 of 57
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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 ... -
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) ... -
High rate testing of composite fastener joints with and without clamp-up
(DEStech Publications Inc., 2018)The NASA Advanced Composites Consortium (ACC) High Energy Dynamic Impact (HEDI) group has been investigating experimentally the effects of testing speed and fastener clamp-up on the behavior of single lap shear composite ... -
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 ... -
Injection repair for restoration of composite properties
(SAMPE, 2019-03)Resin injection is a less intrusive method of repair and does not require near the post processing of other composite repair methods. However, until recently this method of repair has not allowed the restoration of the ... -
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 ... -
Learning robotic grasping strategy based on natural-language object descriptions
(IEEE, 2018-10)Given the description of an object's physical attributes, humans can determine a proper strategy and grasp an object. This paper proposes an approach to determine grasping strategy for an anthropomorphic robotic hand simply ... -
Material state monitoring using embedded sensors for validating models for detecting process-induced damages in polymer composites
(DEStech Publications Inc., 2018)Composite material cure recipes are based on manufacturer-recommended cure cycle inputs, which are developed as a result of various stochastic cure kinetics models during the development of resin formulation. The time, ... -
Measuring and estimating rotary joint axes of an articulated robot
(IEEE, 2020-04-29)The aim of this article is to chronicle a novel methodology for measuring and estimating rotary joint axes of an articulated robot. The key contribution of the proposed methodology is a practical way of estimating rotary ... -
Mechanics-based model for rapid prediction of low-velocity impact damage in composite laminates
(American Institute of Aeronautics and Astronautics Inc., 2020-08-03)A mechanics-based modeling approach is developed to rapidly predict damage in polymer matrix composites resulting from a low-velocity impact event. The approach is incorporated into a computer code that provides an efficient ... -
Mechanics-based modeling approach for rapid prediction of low velocity impact damage in composite laminates
(merican Institute of Aeronautics and Astronautics Inc, 2020-01-05)A mechanics-based modeling approach is developed to rapidly predict damage in polymer matrix composites resulting from a low velocity impact event. The approach is incorporated into a computer code that provides an efficient ... -
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 ... -
Multi-scale characterization of an adhesive bondline with fabrication induced defects
(DEStech Publications, Inc., 2015)A multiscale characterization of an adhesive bondline is performed to investigate the fabrication defects dependent failure mechanisms of an I-beam under four point bending. To obtain a realistic representative volume of ... -
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 ... -
Numerical studies on buckling and post-buckling behavior of stiffened curved composite panel with repairs
(DEStech Publications, 2019-09)Composite stiffened panels are widely employed in the aircraft industry. In particular, curved panels stiffened with hat-stringers are utilized in fuselages. The panels comprise of very thin skin to which stringers are ... -
Parasitic effects of including microwire sensor tube on in-plane compressive strength of carbon-fiber reinforced polymeric composite laminates
(DEStech Publications, 2019-09)The influence of embedding a titanium alloy sensor tube in carbon fiber-reinforced polymer (CFRP) composite laminates on the in-plane compressive strength has been presented. These sensor tubes cause geometric disturbances ... -
Performance evaluation of child safety seats in far-side lateral sled tests at varying speeds
(Association for the Advancement of Automotive Medicine, 2009-10-05)Protection of children in Child Safety Seats (CSS) in side impact crashes has been a topic of recent studies. The objective of this study was to evaluate the performance of CSS in far-side impacts through a series of sled ... -
Progressive damage and failure analysis of bonded composite joints at high energy dynamic impacts
(DEStech Publications, 2019-09)Both wing and fuselage structures utilize bonded composite joints for structural efficiency in modern commercial and military aircraft. To ensure compliance with certification requirements mechanical fasteners are typically ... -
Progressive damage and failure prediction of interlaminar tensile specimen with initial fabrication induced defects
(DEStech Publications Inc., 2018)An automatic solution process to evaluate the effects of fabrication induced defects in composite components is developed. The framework of this approach includes defects extraction from the X-ray computed tomography (CT) ... -
Progressive damage mechanisms in thick 3D composites structures under static and fatigue loading
(DEStech Publications, 2020-09)The objective of this work is to demonstrate validation of predictive capabilities capturing both damage initiation and growth under static and fatigue loading in geometrically complex three-dimensional (3D) composite ...