NIAR Research Publications
Recent Submissions
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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 ... -
Additive manufactured polymer test coupons: Issues and solutions
(ASTM International, 2020-06-04)Leveraging the experience and lessons learned from the National Center for Advanced Material Performance (NCAMP) and the Composite Materials Handbook-17 (CMH-17) composite material databases, a new qualification program ... -
A combined X-Ray CT and mechanistic characterization of bearing failure mechanisms in bolted composite components
(Vertical Flight Society, 2021-05)This paper presents the characterization of bearing failure mechanisms in composite joints with countersunk bolt by applying an X-ray Computed Tomography (XCT) technique and a developed bearing failure model to build the ... -
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 ... -
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 ... -
Compressive response of composite laminates with defects
(American Institute of Aeronautics and Astronautics Inc, 2020-01-05)Defects are inevitable in the manufacture and service of composite laminates and their influence on the mechanical performance of composite laminates can be substantial. Ply waviness and delamination are two major types ... -
Effects of refill friction stir spot weld spacing and edge margin on mechanical properties of multi-spot-welded panels
(MDPI AG, 2020-06-07)Refill friction stir spot welding (RFSSW) is an emerging technology for joining aerospace aluminum alloys. The aim of the study is to investigate the effects of the refill friction stir spot weld spacing and the edge margin ... -
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 ... -
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 ... -
A case for Tsai's Modulus, an invariant-based approach to stiffness
(Elsevier, 2020-11-15)For the past six years, we have been benefiting from the discovery by Tsai and Melo (2014) that the trace of the plane stress stiffness matrix (tr(Q)) of an orthotropic composite is a fundamental and powerful scaling ... -
Crack length correction and root rotation angle in a sandwich single cantilever beam (SCB) fracture specimen
(KeAi Publishing Communications Ltd, 2020-12)Crack root rotation is a measure of deviation from clamped boundary conditions of region in front of the crack tip. The root rotation depends on the shear force and bending moment acting at the crack tip. Such rotation ... -
Automated fiber placement (AFP)—Effects of features and defects
(DEStech Publications, 2019)Automated Fiber Placement (AFP) manufacturing methods, considered to be one of the most advanced methods of composite manufacturing, are used in fabricating complex and large scale composite structures. During AFP ... -
Development and validation of finite element impact models of high-density UAS components for use in air-to-air collision simulations
(Taylor and Francis Inc., 2020-05-18)Understanding the severity of mid-air collisions between lightweight fixed-wing unmanned aerial systems (FW-UASs) and manned aircraft is a critical flight safety issue. Finite element models of high-density FW-UAS components ... -
Damage initiation and fracture analysis of honeycomb core single cantilever beam sandwich specimens
(SAGE, 2020-04-27)Fracture testing and analysis of aerospace grade honeycomb core sandwich constructions using a single cantilever beam test methodology is presented here. Influence of various parameters such as facesheet thickness, core ... -
Aluminium in human brain tissue from donors without neurodegenerative disease: A comparison with Alzheimer's disease, multiple sclerosis and autism
(Springer, 2020-05-08)A burgeoning number of studies are demonstrating aluminium in human brain tissue. While research has both quantified and imaged aluminium in human brain tissue in neurodegenerative and neurodevelopmental disease there are ... -
Allowable generation and generic basis value for multiple loading and environmental conditions
(CAMX, 2020)Engineers conduct expensive testing in different environmental conditions to obtain the necessary material allowables. These values consider scatter in composite material constituents and structure according to the “Building ...
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