Effects of Strain Hardening on Response of Skin Panels in Hypersonic Flow

LaFontaine, Jonathen; Gogulapati, Abhijit; McNamara, Jack J.

doi:10.2514/1.j054582

Cited by 12 publications

(3 citation statements)

References 35 publications

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“…Typically, simple material constitutive models like isotropic elasticity or J 2 -plasticity are used, where material properties are either extracted from handbooks, e.g. in [2] or calibrated from available experiments [4,7,24,33]. Macroscale material properties like stiffness, strength and hardening response of metals like Ti alloys, inherently depend on underlying microstructural features such as crystallographic texture, misorientation and grain size distributions.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty Quantified Parametrically Homogenized Constitutive Models for Microstructure-Integrated Structural Simulations

Kotha

Ozturk

Smarslok

et al. 2020

Integr Mater Manuf Innov

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This paper investigates the role of material microstructures in structural analysis and establishes the need for microstructureintegrated constitutive models in predicting structural response. A focus is on microstructure and temperature dependency of stresses and plastic strains in a structural panel under realistic loading conditions. Structural analysis is conducted using the recently developed uncertainty-quantified parametrically homogenized constitutive model (UQ-PHCM) for near-alpha Titanium alloys like Ti6242S. PHCMs exhibit explicit microstructural dependency and are developed from homogenization of crystal plasticity finite element simulation results with machine learning. Uncertainties due to model reduction, data sparsity and microstructural variability are accounted for in the model. Structural response with the UQ-PHCMs is compared to those predicted by isotropic elasticity and J 2 plasticity models without explicit microstructure information. Parametric studies illustrate how different uncertainties in the UQ-PHCM framework propagate to the structural response variables. The results also show the relative contribution of different microstructural features to the propagated uncertainty in structural response variables. The studies establish the UQ-PHCM as an effective tool for reliable structural analysis with consequences in material design.

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Section: Introductionmentioning

confidence: 99%

Uncertainty Quantified Parametrically Homogenized Constitutive Models for Microstructure-Integrated Structural Simulations

Kotha

Ozturk

Smarslok

et al. 2020

Integr Mater Manuf Innov

View full text Add to dashboard Cite

show abstract

“…In their consequent work, deformations caused by thermal heating were included [11]. Fluid-thermal-structural interaction at hypersonic speed (Ma = 5.3) with cyclic loading including dynamic effects due to fluttering of skin panels, damage fatigue and effects of strain hardening and its comparison to elastic models were investigated in [14]. A thermoviscoplastic analysis of cooled structures in hypersonic flow was conducted by [27].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Fluid-Structure Interaction for Thermal Buckling in Hypersonic Flow

Martin

Daub

Esser

et al. 2020

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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Experiments have shown that a high-enthalpy flow field might lead under certain mechanical constraints to buckling effects and plastic deformation. The panel buckling into the flow changes the flow field causing locally increased heating which in turn affects the panel deformation. The temperature increase due to aerothermal heating in the hypersonic flow causes the metallic panel to buckle into the flow. To investigate these phenomena numerically, a thermomechanical simulation of a fluid-structure interaction (FSI) model for thermal buckling is presented. The FSI simulation is set up in a staggered scheme and split into a thermal solid, a mechanical solid and a fluid computation. The structural solver Abaqus and the fluid solver TAU from the German Aerospace Center (DLR) are coupled within the FSI code ifls developed at the Institute of Aircraft Design and Lightweight Structures (IFL) at TU Braunschweig. The FSI setup focuses on the choice of an equilibrium iteration method, the time integration and the data transfer between grids. To model the complex material behaviour of the structure, a viscoplastic material model with linear isotropic hardening and thermal expansion including material parameters, which are nonlinearly dependent on temperature, is used.

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“…Airfoil flutter, caused by the mutual interaction of the elastic, inertial, and unsteady aerodynamic forces, is a challenging and important issue in the field of aircraft design due to its potential threat to flight safety (McNamara and Friedmann, 2007, 2011; Wang et al., 2014; Lafontaine et al., 2016; Baghdasaryan et al., 2017). For an aircraft, the airfoil is a crucial component because it contributes most of the lift to the aircraft.…”

Section: Introductionmentioning

confidence: 99%

Dynamic damage analysis of airfoil flutter for a generic hypersonic flight vehicle

Zhang

Wang

Feng

et al. 2019

Journal of Vibration and Control

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The main aim of this paper is to establish the relationship between the airfoil flutter with the flight dynamics of a generic hypersonic flight vehicle (HFV) and analyze the airfoil damage variation during the airfoil flutter. Based on the motion equations of the two degrees of freedom airfoil model and the longitudinal dynamics of the HFV, an airfoil dynamic model is established. By using a coupling equation, the relationship between airfoil flutter and the flight dynamics is estimated. According to the stress–strain ([Formula: see text]) model and the strain–fatigue damage ([Formula: see text]) model, the influence of the stress on the airfoil flutter damage is analyzed. The simulation results show that the flutter of the airfoil is closely related to the flight dynamics for the HFV and the airfoil flutter damage is closely related to the flutter amplitude of the airfoil.

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Effects of Strain Hardening on Response of Skin Panels in Hypersonic Flow

Cited by 12 publications

References 35 publications

Uncertainty Quantified Parametrically Homogenized Constitutive Models for Microstructure-Integrated Structural Simulations

Uncertainty Quantified Parametrically Homogenized Constitutive Models for Microstructure-Integrated Structural Simulations

Numerical Modelling of Fluid-Structure Interaction for Thermal Buckling in Hypersonic Flow

Dynamic damage analysis of airfoil flutter for a generic hypersonic flight vehicle

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