Hai Mei

• Wuhan University of Technology

Transparent protective composites inspired by natural tortoiseshell structures offer a promising solution for high-performance ballistic applications. However, the design optimization of these composites under dynamic impact conditions remains underexplored. This study systematically examines the effects of various stacking patterns, layer thicknes...

High temperature and ultrafast heating rate, the characteristics of ultrafast high‐temperature sintering (UHS) process, make it difficult to capture the evolution of sintering behavior and explore sintering mechanism of alumina ceramics. In this study, molecular dynamic simulations are adopted to describe the sintering behaviors of equal‐sized and...

Fracture in ductile materials often occurs in conjunction with plastic deformation. However, in the bond-based peridynamic (BB-PD) theory, the classic mechanical stress is not defined inherently. This makes it difficult to describe plasticity directly using the classical plastic theory. To address the above issue, a unified bond-based peridynamics...

Grain boundaries (GBs) play a significant role in the deformation behaviors of nanocrystalline ceramics. Here, we investigate the compression behaviors of nanocrystalline boron carbide (nB4C) with varying grain sizes using molecular dynamics simulations with a machine-learning force field. The results reveal quasi-plastic deformation mechanisms in...

The structure of natural biomaterials such as mollusk shells, conch shells, fish scales, and sea turtles, serves as a basis for inspiration in this study. We designed two composites with octahedral structures which can preferentially hinder the propagation of stress waves through the material. Mechanical properties and damage mechanisms of bionic o...

The elasticity matrix and the coefficients of thermal expansion (CTEs) of 8-harness satin-woven (8HS) carbon-fiber-reinforced carbon matrix (C/C) composites at high temperatures were obtained by the asymptotic homogenization method (AHM) and finite element method (FEM). By analyzing the microstructure of the 8HS C/C composites, a representative vol...

Generally, bioinspired structures often exhibit superior mechanical performance compared to traditional structures, due to their excellent impact resistance and energy absorption. In the present study, we design a bioinspired transparent hexahedral structure, in which the glass panels on the first and second layers are arranged in different ways. U...

The compression-induced deformation mechanisms of boron carbide (B4C) have not been well understood due to its complex crystal structure. Here, we investigate the mechanical behaviors and deformation mechanisms of B4C under various compression conditions, using molecular dynamics simulations with a machine-learning force field. Two structural trans...

This article proposes a modeling method for C/C-ZrC composite materials. According to the superposition of Gaussian random field, the original gray model is obtained, and the threshold segmentation method is used to generate the C-ZrC inclusion model. Finally, the fiber structure is added to construct the microstructure of the three-phase plain wea...

In this work, we have developed a novel bond-associated non-ordinary state-based peridynamic (BA-NOSB PD) model for the numerical modeling and prediction of the impact response and fracture damage of quasi-brittle materials. First, the improved Johnson-Holmquist (JH2) constitutive relationship is implemented in the framework of BA-NOSB PD theory to...

The prediction of damage and failure to fiber-reinforced polymer composites in extreme environments, particularly when subjected to impact loading, is a crucial issue for the application and design of protective structures. In this paper, based on the prototype microelastic brittle (PMB) model and the LaRC05 composite materials failure model, we pr...

The introduction of residual stresses using laser shock peening (LSP) is an effective means of improving the mechanical properties of ceramics. Numerical simulations offer greater convenience and efficiency than in-lab experiments when testing the effects of different processing techniques on residual stress distribution. In this work, a B4C-TiB2 c...

The response of nanopillar to impact loading is significantly different from that of plate materials. To investigate the deformation behavior and mechanism of boron carbide nanopillars, molecular dynamics simulation is performed to simulate the impact of B11CpCBC nanopillars at various velocities along c-axis ([0001]), b-axis ([1¯21¯0]) and d-axis...

The mechanical properties of quasi-brittle materials, which are widely used in engineering applications, are often affected by the thermal condition of their service environment. Moreover, the materials appear brittle when subjected to tensile loading and show plastic characteristics under high pressure. These two phenomena manifest under different...

The ablation of ultra-high-temperature ceramics (UTHCs) is a complex physicochemical process including mechanical behavior, temperature effect, and chemical reactions. In order to realize the structural optimization and functional design of ultra-high temperature ceramics, a coupled thermo-chemo-mechanical bond-based peridynamics (PD) model is prop...

The densification process of sintered alumina is mainly controlled by surface, lattice, and interface diffusion, and many experimental researches show that heating rate can affect the transfer of matter. Thus, to further reveal the effect of heating rate on sintering mechanism of alumina nanoparticle, molecular dynamic simulations were performed at...

A rate-dependent peridynamic ceramic model, considering the brittle tensile response, compressive plastic softening and strain-rate dependence, can accurately represent the dynamic response and crack propagation of ceramic materials. However, it also considers the strain-rate dependence and damage accumulation caused by compressive plastic softenin...

As a mathematical expression of the dynamic mechanical behavior, the constitutive model plays an indispensable role in numerical simulations of ceramic materials. The current bond-based peridynamic constitutive models can accurately describe the dynamic mechanical behavior of partial ceramic materials under impact loading, however, the predicted va...

Boron carbide is considered as an ideal armor material, but its abnormal failure under high speed impact hinders its application. In order to explore the compression deformation behavior and mechanism of boron carbide, molecular dynamics simulation of reactive force-field (ReaxFF) interatomic potential is adopted to simulate the uniaxial compressio...

Strain gradient with strong size dependency and structural association (geometry or microstructure) can efficiently tune the performances of semiconductors by the flexoelectric coupling effect. In this work, we studied a novel asymmetric beam-like semiconductor made by functionally graded (FG) flexoelectric materials. When being applied with pure b...

In this study, a new bond-based peridynamic model is proposed to describe the dynamic properties of ceramics under impact loading. Ceramic materials show pseudo-plastic behavior under certain compressive loadings with high strain-rate, while the characteristic brittleness of the material dominates when it is subjected to tensile loading. In this mo...

Understanding the effects of water on the mechanical properties of silica glass is important for many applications of silicate glasses. In this study, the effects of water on both elastic and plastic properties of pure silica glass are investigated. The introduction of molecular water leads to an increase of Young's modulus of silica glass at low w...

NanotwinnedMgnanopillars under uniaxial compression were investigated by molecular dynamics simulations. The simulation results indicate thatmore {101̄1}101̄2̄ TBs and less {101̄2}101̄1̄TBs are recommended to introduce for obtainingMgnanopillars being of higher compressive yield strength. The pre-built {101̄1}101̄2̄TBs restrains the nucleation of n...

The mechanical properties of the CoSb3/Ti interface play a critical role in the application of thermoelectric devices. To understand the failure mechanism of the CoSb3(001)/Ti(01\( \bar{1} \)0) interface, we investigated its response during tensile deformations by first-principles calculations. By comparison with the result between the perfect inte...

Interfacial structure plays a critical role in the application of thermoelectric (TE) devices. To understand the bonding character of the CoSb3/Ti interface, we investigated its lattice structure, interface bonding energy, and electronic properties by first-principles calculations. Six possible models for CoSb3/Ti interfaces with an orientation rel...

Molecular dynamics simulation has been performed to study the mechanical properties and behaviour of the interface between Al and Al-terminated α-Al<sub align="right"> 2 </sub>O<sub align="right"> 3 </sub> under tension loading. The atomistic structures of the metal/ceramic interface are first modelled according to experimental results. The interat...

In this paper the sensitivity of strain rate and size effect with different particle volume fraction in SiCp/Al Composite were studied through the experiment. Specimens with 40% and 30% SiC particle volume fraction were made. There are three types of particle sizes in each volume fraction. The sensitivity of strain rate and the effect of particle s...

The size effect on particles reinforced metal matrix composites (MMCp) was investigated by a numerical method. A numerical multi-particles unit cell model has been constructed to carry out numerical analysis. In this model, circle particles were randomly placed in matrix according to uniform distribution, the sizes of particles in the paper were cl...