Crack Growth Simulation of Functionally Graded Materials Based on Improved Bond-Based Peridynamic Model

Functionally graded materials (FGMs) are widely used in the aerospace industry, especially for the thermal protection shields of aerospace vehicles. Studies show that the initiation and expansion of micro-cracks are important factors that adversely affect the service life of these shields. Based on the peridynamic theory of bonds, an improved peridynamic model is proposed in the present study for FGMs. In the proposed model, integral equivalence is applied to calculate the required material parameters. Obtained results reveal that this method can better reflect the gradient change of material properties.

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Conjugate heat transfer study of hypersonic flow past a cylindrical leading edge composed of functionally graded materials

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/09544062211048179 ◽

2021 ◽

pp. 095440622110481

Author(s):

Bibin John ◽

Sudhanva Kusuma Chandrashekhara ◽

Vivekkumar Panneerselvam

Keyword(s):

Heat Transfer ◽

Fluid Flow ◽

Functionally Graded Materials ◽

Isotropic Material ◽

Conjugate Heat Transfer ◽

Thermal Protection ◽

Leading Edge ◽

Functionally Graded ◽

Graded Materials ◽

Flow And Heat Transfer

Aero-thermodynamic analysis of a cylindrical leading edge placed in a hypersonic stream is carried out using an in-house developed conjugate heat transfer (CHT) solver. Isotropic and functionally graded materials (FGM) are tested as heat shields to understand the effects of the material property on the flow structure and aerodynamic heating associated with the mutual coupling of fluid flow and heat transfer. A simplified partitioned approach is employed to couple the independently developed fluid flow and heat transfer solvers to perform conjugate heat transfer studies. This framework employs a cell-centred finite volume formulation with an edge-based algorithm. Both strong and loose coupling algorithms are implemented for the data transfer across the fluid–solid interface. A test case of hypersonic flow over a cylindrical leading edge composed of an isotropic material is considered to validate the accuracy and correctness of numerical formulation adopted in the in-house solver. The significance of solid domain materials on the conjugate heat transfer has been studied by considering both isotropic material and FGM. The loosely coupled CHT solver required 10 times less simulation time when compared with the strongly coupled CHT solver. The interface heat flux evolution over time showed a decreasing trend, whereas an increasing trend was for the interface temperature. The current study strongly recommends CHT analysis for the design of thermal protection system of space vehicles. The thermal performance of FGMs composed of various volume fractions of Zirconia and Titanium alloy (Ti6Al4V) is assessed. The temperature distributions obtained from the CHT analysis shows that FGM with a power index of unity is a good material choice for thermal protection systems.

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Study on Thermally Induced Crack Propagation Behavior of Functionally Graded Materials Using a Modified Peridynamic Model

Advances in Materials Science and Engineering ◽

10.1155/2020/1317965 ◽

2020 ◽

Vol 2020 ◽

pp. 1-17

Author(s):

Fei Wang ◽

Yu’e Ma ◽

Yanning Guo ◽

Wei Huang

Keyword(s):

Fracture Toughness ◽

Crack Propagation ◽

Functionally Graded Materials ◽

Initial Temperature ◽

Functionally Graded ◽

Thermal Crack ◽

Graded Materials ◽

Ceramic Fracture ◽

Thermally Induced ◽

Peridynamic Model

Peridynamic (PD) theory is used to study the thermally induced cracking behavior of functionally graded materials (FGMs). A modified thermomechanical peridynamic model is developed. The thermal crack propagation of a ceramic slab in quenching is calculated to validate the modified PD model. The results predicted by the modified PD model agree with previously published numerical and experimental ones. Compared with the original PD model, the calculation accuracy of the modified PD model for thermal cracking is improved. The thermal cracking in FGMs is also simulated. The effects of material shape, initial temperature, and ceramic fracture toughness on thermal crack propagation behaviors are studied. It can be found that the thermal cracks in FGMs are still in periodical and hierarchical forms. The metal materials in FGMs can prevent crack initiation and arrest the long cracks. The crack number tends to be increased with the increasing initial temperature, while the strengthened ceramic fracture toughness can decrease it.

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Self-propagating high-temperature synthesis of functionally graded materials as thermal protection systems for high-temperature applications

Journal of Materials Research ◽

10.1557/jmr.2003.0057 ◽

2003 ◽

Vol 18 (2) ◽

pp. 448-455 ◽

Cited By ~ 13

Author(s):

N. Bertolino ◽

M. Monagheddu ◽

A. Tacca ◽

P. Giuliani ◽

C. Zanotti ◽

...

Keyword(s):

High Temperature ◽

Functionally Graded Materials ◽

Thermal Protection ◽

Functionally Graded ◽

Temperature Synthesis ◽

Thermal Tests ◽

Graded Materials ◽

Thermal Barriers ◽

High Temperature Synthesis ◽

Spatial Composition

Self-propagating high-temperature synthesis was used to prepare boride-based functionally graded materials (FGMs) as thermal barriers for space re-entry vehicles. FGMs are characterized by inhomogeneous spatial composition, resulting in different spatial characteristics. In this work, the FGMs were composed of a ceramic [i.e., MB2 (M = Ti, Zr, Hf)] and a metallic (i.e., NiAl) side, joined together by composite layers of graded stoichiometries of the two components. Thus, in the same material, the boride end gives thermal insulation, while the intermetallic end offers an easy junction to the structure of the space aircraft. The prepared FGMs showed good adhesion between the layers and global compactness after preparation and thermal tests. The microhardness along the samples was measured, and their insulating capabilities were evaluated.

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A peridynamic model for dynamic fracture in functionally graded materials

Composite Structures ◽

10.1016/j.compstruct.2015.07.047 ◽

2015 ◽

Vol 133 ◽

pp. 529-546 ◽

Cited By ~ 68

Author(s):

Zhanqi Cheng ◽

Guanfeng Zhang ◽

Yenan Wang ◽

Florin Bobaru

Keyword(s):

Functionally Graded Materials ◽

Dynamic Fracture ◽

Functionally Graded ◽

Graded Materials ◽

Peridynamic Model

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A Peridynamic Model for Analyzing Fracture Behavior of Functionally Graded Materials Used as an Interlayer

Acta Mechanica Solida Sinica ◽

10.1007/s10338-020-00173-0 ◽

2020 ◽

Vol 33 (6) ◽

pp. 781-792 ◽

Cited By ~ 1

Author(s):

Zhanqi Cheng ◽

Zhengqiang Fu ◽

Yu Zhang ◽

Hongxia Wu

Keyword(s):

Functionally Graded Materials ◽

Fracture Behavior ◽

Functionally Graded ◽

Graded Materials ◽

Peridynamic Model ◽

Materials Used

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Module for wireless communication in aerospace vehicles

Aerospace Research in Bulgaria ◽

10.3897/arb.v33.e14 ◽

2021 ◽

Vol 33 ◽

pp. 195-209

Author(s):

Adelina Miteva ◽

Anna Bouzekova-Penkova

Keyword(s):

Wireless Communication ◽

Literature Review ◽

Functionally Graded Materials ◽

Review Paper ◽

Critical Discussion ◽

Functionally Graded ◽

Aerospace Vehicles ◽

Graded Materials ◽

Potential Applications ◽

The Subject

Functionally graded materials (FGMs) are currently the subject of great and ever-growing interest from industry and science, and are widely used due to their advantages. These advantages are due to their unique properties and, therefore, their many real and potential applications in various fields of industry, science and everyday life. In this literature review paper, we will briefly focus on some of the properties of FGMs and on some of the existing and expanding future applications of FGM in aerospace and related industries. A critical discussion is presented. Possible future expansion of work in this area is being considered.

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