Determination of thermophysical properties and density volume fractions of Al2O3/Y-ZrO2 layered composite materials using transient thermography and two-stage inverse nonlinear heat conduction analysis

2020 ◽  
Vol 127 (4) ◽  
pp. 045110
Author(s):  
Sahar Kooshki ◽  
Andreas Mandelis ◽  
Mahmoud Khodadad ◽  
Amir Khosravifard ◽  
Alexander Melnikov
Keyword(s):  
Heat Conduction ◽  
Composite Materials ◽  
Thermophysical Properties ◽  
Layered Composite ◽  
Nonlinear Heat Conduction ◽  
Two Stage ◽  
Volume Fractions ◽  
Transient Thermography

Transient Heat Conduction in a Rod of Finite Length With Variable Thermal Properties

1960 ◽  
Vol 27 (4) ◽  
pp. 617-622 ◽  
Author(s):  
W. H. Chu ◽  
H. N. Abramson
Keyword(s):  
Thermal Properties ◽  
Heat Conduction ◽  
Finite Length ◽  
Thermophysical Properties ◽  
Numerical Procedure ◽  
Transient Heat Conduction ◽  
Theoretical Solution ◽  
Rod Of Finite Length

This paper presents a theoretical solution for transient heat conduction in a rod of finite length with variable thermal properties. A numerical procedure is developed and the results of one example are presented and compared with the corresponding solution for the case of constant properties. Application to the problem of determination of thermophysical properties is discussed briefly.

Heat conduction in layered, composite materials

1985 ◽  
Vol 57 (5) ◽  
pp. 1569-1573 ◽  
Author(s):  
James Baker‐Jarvis ◽  
Ramarao Inguva
Keyword(s):  
Heat Conduction ◽  
Composite Materials ◽  
Layered Composite

Determination of the Optimal Structure of a Layered Composite Material for Maximum Strength Characteristics

2021 ◽  
Vol 1040 ◽  
pp. 124-131
Author(s):  
Ljubov Aleksandrovna Bokhoeva ◽  
I.O. Bobarika ◽  
A.B. Baldanov ◽  
Vitaly Evdokimovich Rogov ◽  
Anna S. Chermoshentseva
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Mechanical Characteristics ◽  
Minimum Weight ◽  
Layered Composite ◽  
Number Of Layers ◽  
Reinforcing Material ◽  
Intensive Development ◽  
Physical And Mechanical Characteristics

Due to the intensive development of composite materials and technologies for producing parts from them, they are increasingly used in various industries, including the manufacture of products with increased requirements for the characteristics of final products (strength, stiffness, minimum weight, etc.). In this regard, the authors analyzed the possibility to optimize the layered structure of a composite material in order to give it a pronounced predictable anisotropy of properties required for the final product. Thus, the influence of the orientation of the fibers of the reinforcing material in different layers of the package and the number of layers of the package on the physical and mechanical characteristics of the hypothetical product were analyzed. The problem was solved through the example of the development of a wing for a hypothetical UAV.

Experimental and numerical sizing of a delamination defect in layered composite materials

2018 ◽  
Vol 84 (10) ◽  
pp. 59-66
Author(s):  
A. S. Urnev ◽  
A. S. Chernyatin ◽  
Yu. G. Matvienko ◽  
I. A. Razumovskii
Keyword(s):  
Inverse Problem ◽  
Composite Materials ◽  
Fiber Optic ◽  
Layered Composite ◽  
Geometric Parameters ◽  
Optimal Topology ◽  
Defect Zone ◽  
Strain Stress ◽  
Mathematical Processing

A methodical approach to the estimation of the localization zone and geometric parameters of a delamination defect in layered composite materials is presented on the basis of mathematical processing of the experimental results of deformation measurements obtained with a grid of fiber-optic sensors. The results of methodological developments related to the determination of the optimal topology of the grid of sensors to ensure the detection of defects of a given size with the necessary accuracy and determination of their parameters are presented. We present methods for computational analysis and simulation of the strain-stress state in the defect zone, based on the algorithm used for modeling the problems of strain-stress analysis in the defect zone using 2D finite elements, instead of 3D ones, thus allowing the use a model of lower dimensionality and retain all the features of the stress-strain state. The results of methodological developments related to the determination of the defect parameters from the results of strain measurements using the methodology of solving the inverse problem, based on solving the problem of minimizing the discrepancy between the vector of deformation response and the vector of initial parameters are presented. The technique is implemented as a software consisting of a series of macros for ANSYS and programs for MATLAB. The results of cyclic testing of a sample from a multilayer CM with a delamination type of defect are presented. Estimation of the increment in the defect size upon loading is performed by mathematical processing of data recorded by fiber-optic strain sensors glued on one of the sample surfaces, based on the solution of the inverse problem. Comparison of the results of calculations of geometric parameters of the defects with the measurement data obtained by the method of ultrasonic flaw detection showed good agreement between them.

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