Browsing CE Theses and Dissertations by Author "Keshavanarayana, Suresh R."
Now showing items 1-20 of 34
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A numerical homogenization approach to characterize in-plane anisotropic hyperelastic responses of a non-metallic honeycomb core
Moghaddam, Hooman Shahverdi (Wichita State University, 2020-05)In this research, a numerical homogenization approach to predict the experimentally observed nonlinear elastic, orthotropic and asymmetric responses of non-metallic honeycomb cores under large in-plane deformations is ... -
A numerical study on the triaxiality distribution in a single shear lap fastener joint
De Abreu Barriga, Armando A. (Wichita State University, 2017-12)Fastened joints are used extensively in the aerospace industry and play an important role in defining the crashworthiness of the structure [1, 2]. As larger finite element models (FEM) are developed, joints are typically ... -
A three-dimensional numerical analysis of the effect of embedding cylindrical microwire sensors on the compressive strength of carbon-fiber reinforced composite laminates
Maini, Raghav (Wichita State University, 2017-12)The objective of this 3D finite element analysis study is to evaluate the effect on compressive strength of a laminated composite specimen, when cylindrical microwire tubes are embedded inside the structure. These microwire ... -
Analytical modification of the V-notched rail shear test apparatus for dynamic testing
Tatipalli, Vinila Rao (Wichita State University, 2014-05)Dynamic testing is required in structural engineering applications to characterize material properties over a wide range of strain rates and temperatures. One of the major concerns to obtain accurate data during dynamic ... -
Characterization of rate effects on Mode-I Double-Cantilevered Beam tests through finite element modeling
Pepper, Christopher Todd (Wichita State University, 2011-05)Tests of Mode-I delamination in Double Cantilever Beam (DCB) specimens were modeled with the finite element solver, LS-DYNA, to simulate the behavior of composite materials at high speed loading rates (between 2 in/s and ... -
Characterization of the in-plane homogenized mechanical properties of a hexagonal honeycomb core
Ramdial, Hooloomann (Wichita State University, 2020-12)The in-plane homogenized elasto-plastic behavior of a hexagonal aluminum honeycomb core has been investigated using experiments and finite element analysis of an idealized representative volume element. In-plane uniaxial ... -
Crushing behavior of corrugated laminated beams at different stroke rates
Tan, Kian Yip (Wichita State University, 2013-12)Crashworthiness has become an important aspect in vehicle design due to the stringent requirements on occupant safety under survivable accident scenarios. The uses of composite materials have increased due to their ... -
Cure dependent thermal conductivity of carbon fiber/epoxy composite - experiments and analysis
Legesse, Ephriem T. (Wichita State University, 2018-12)Knowledge of thermal conductivity of fiber reinforced composites is important to understand the thermal gradients and heat build-up during cure. Thermal conductivity of composite materials depends on temperature, direction ... -
Cure-induced residual stresses in a notched laminate
Febrinaldy, Budi (Wichita State University, 2014-07)The cure-induced residual stresses in the vicinity of the free edge of an open hole in IM7/977-2 carbon/epoxy laminates have been investigated. Holes in laminated structures are intended for fastener joints, access ports ... -
Cylindrical sheet forming analysis of hexagonal cell honeycomb core using 3D finite element analysis
Cazorla, Claudia R. (Wichita State University, 2022-05)This document presents the creation of a detailed 3D numerical model of a fiberglass/phenolic hexagonal honeycomb core for studying in-plane and flexural responses. The core cell geometry was modeled in detail to be ... -
Development of homogenized elasto-plastic material behavior of hexagonal cell honeycomb core using experiments and finite element analysis
Ivanov, Dmitrii (Wichita State University, 2020-05)This research attempted to describe the geometry of HexWeb CR-III-1/8-5052-8.1N commercial aluminum honeycomb core and give some statistical information about its deviation from the average. The finite element model of ... -
Effect of embedding cylindrical microwire sensor tubes on the in-plane compressive strength of carbon-fiber reinforced polymer composite laminates
Bhasin, Akhil (Wichita State University, 2016-08)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 ... -
Effect of embedding cylindrical sensor tube on fatigue life of carbon/epoxy cross-ply composite laminate
Rajendra Kumar Nahar, Aashish Nahar (Wichita State University, 2016-05)In this study the effect of embedded sensor tube on fatigue life of composite structure under compression fatigue has been determined. Specimens were prepared using carbon/epoxy prepregs stacked in [(90/0/90)3 90/0]s with ... -
Evaluation of a progressive damage model for a single lap-shear joint of multi-directional laminates
Marco Carrillo, Rodrigo (Wichita State University, 2018-07)This document presents results from a numerical study of the progressive damage capabilities of the MAT162 material model in Ls-DYNA explicit finite element code. Single-shear fastener lap joint of multi-directional laminates ... -
Evaluation of composite debris modeling method for high loading rate events
Baum, Nathaniel J. (Wichita State University, 2020-12)The objective of this study was to assess the effectiveness of debris modeling for simply connected composite laminates at high loading rates using an adaptive mesh method in Finite Element Analysis (FEA). Double shear ... -
Evaluation of tabbed composite specimens for material characterization under medium loading rates: a numerical study
Can, Burak (Wichita State University, 2016-08)Compression failure of laminated composites is a very complex mechanism involving one or more failure modes especially under high loading rates. Tabbed specimens per ASTM D695 / SACMA SRM 1R-94 are used to measure compressive ... -
Evolution of faying surface roughness and coefficient of friction around fastener hole in 2024-T3 clad aluminum load transfer specimen
Shrestha, Amul Sudan (Wichita State University, 2014-12)The evolution of surface roughness and friction coefficient on the faying surfaces of 2024-T3 clad aluminum sheets in a fastener joint has been investigated experimentally. The terminal values of the roughness and friction ... -
An experimental study of the edge chamfer trigger mechanism
Elyas, Sana Fazal (Wichita State University, 2011-07)An experimental investigation was conducted to study the behavior of an edge chamfer on the resulting crushing response of flat laminated composite strips. The effects of variables such as chamfer angle, stacking sequence ... -
Experimental validation of honeycomb core forming limits
Kahle, Kaitlyn (Wichita State University, 2019-05)The objective of this thesis is to understand the deformation and potential node bond failures of fiberglass/phenolic honeycomb core during forming. This data will be used to provide experimental validation of a hyper ... -
Failure mechanisms and energy dissipation in composite off-axis tension specimens with open holes
Kolachalama, Annapurna (2007-05)Predicting failure of fabric composite laminates in the presence of flaws such as cracks and stress raisers has been an important research problem for the last two decades. Most of the existing models for predicating notched ...