Numerical Investigation on the Ballistic Performance of Semi-Cylindrical Nacre-like Composite Shells under High-Velocity Impact
Abstract
:1. Introduction
2. Elasticity Theoretical Analysis
2.1. Problem Description
2.2. Theoretical Formula Derivation
2.3. Validation of Theoretical Results
2.4. Theoretical Parameter Analysis
3. Materials and Numerical Methods
3.1. The Generation of Nacre-like Composites
3.2. Materials Models
3.2.1. Material Model of Ceramic
3.2.2. Material Model of Aluminum (AA5083-H116)
3.2.3. Aluminum Material Model Validation
4. Resistance Characteristic Analysis
4.1. Impact Response of Semi-Cylindrical Shells
- The bullet impacts the composite outer surface, and the outer surface is concaved.
- Tablets were impacted to fragments, and some tablets fall off from the inner surface of composites.
- Tablets almost completely show failure at the impact position, and the slurry begins to deform and show failure.
- The slurry shows failure completely and the composites are penetrated by bullets.
- Ceramic produce more morphological damage during resistance and absorb more impact energy of the bullet.
- The semi-cylindrical shell structure weakens the brittle fracture of the ceramic and enhances the overall resistance.
4.2. Energy Variation Analysis
5. Discussion of Impact Velocity
5.1. Damage Characteristics Analysis
5.2. Residual Velocity Analysis
5.3. Semi-Cylindrical Shell Top Displacement Analysis
6. Summary and Conclusions
- Based on the two-dimensional structure of the nacre, an elastic theoretical model of the two-phase distribution was established. The theoretical model was verified to be reliable and can be used to predict the equivalent elastic modulus of nacre-like composites.
- From the theoretical results and numerical models, increasing the elastic modulus of the tablets can enhance the equivalent elastic modulus of the nacre-like composite more effectively. When the elastic modulus of the slurry is greater than 20% of the tablets, and its volume fraction is less than 10%, the isotropic properties of the composite can be better achieved.
- The semi-cylindrical ceramic shell has the highest stiffness and ballistic limit, but the violent vibration generated after the impact causes penetrating cracks. The cracks eventually lead to the whole failure of the structure. The nacre-like composites have higher ballistic limit than aluminum shell. The bullet impact only causes local failure, and the structural integrity is better maintained. Semi-cylindrical aluminum shells have the lowest ballistic limit, it was damage by the shear of bullet’s edge and forms a large fragment only in front of the warhead.
- Under the same conditions, the regularly composites have less damage and lower bullet residual velocity than the irregularly composites, this indicates regular structure has better impact resistance performance.
- The semi-cylindrical shell vibrated under the bullet impact, and the vibration amplitude increased with the velocity of bullet impact. When the bullet impact velocity is high, the vibration of ceramic is more intense than nacre-like composite and aluminum.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Glossary
Tensile stiffness | |
Cross-sectional area | |
Length | |
Structure size | |
Strain | |
Equivalent elastic modulus | |
Tensile stiffness of A, B elastomers | |
Strain of A, B elastomers | |
Young’s elastic modulus of A, B elastomers | |
Fraction of volume occupied, | |
Load | |
Load of A, B elastomers | |
Fraction of volume occupied, | |
Elastic modulus of the series part | |
Volume fraction of tablets in the layer, | |
Elastic modulus of slurry | |
Elastic modulus of tablets | |
Volume fraction of the tablets in the composites, | |
Volume fraction of the tablets | |
Hydrostatic pressure | |
the constant of Drucker-Prager model | |
The pressure at the Hugoniot elastic limit (HEL) | |
The equivalent stress at the HEL | |
The strain at failure | |
Material constants | |
Ceramic density | |
Volumetric strain | |
Static yield stress | |
Equivalent plastic strain | |
Dimensionless temperature | |
Current temperature | |
Melting temperature | |
Transition temperature | |
Reference temperature | |
Damage parameter | |
Increment of the equivalent plastic strain | |
Material parameters determined from different mechanical test | |
Reference strain rate | |
Inelastic heat fraction | |
Bulk speed of sound | |
Slope of the linear | |
Proof/Yield stress | |
Strain hardening coefficient | |
Non-axial compressive yield stress | |
Shear modulus | |
Density | |
Young’s modulus of elasticity | |
Poisson’s ratio | |
Specific heat | |
Thermal softening constant | |
Constants of best fit data points | |
Ballistic limit; | |
Impact velocity of bullet | |
Residual velocity of bullet |
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Material Properties | Value |
---|---|
Density (kg/m3) | 3215 |
shear modulus, (Gpa) | 193 |
Drucker-Prager plastic model | |
The constant of Drucker-Prager model, | 0.00392 |
The constant of Drucker-Prager model, | 1.5384 |
Hardening parameters of static water pressure, (Gpa) | 0.75 |
Non-axial compressive yield stress, (Mpa) | 6605.66 |
Johson-cook rate-related models | |
Reference strain rate, (s−1) | 1 |
Strain hardening coefficient, | 0.009 |
Mie-Grüneisen state equation | |
Bulk speed of sound, (m/s) | 8272.2 |
Slope of the linear, | 1.32 |
Equivalent Plastic Strain, | Stress Triaxiality |
---|---|
0.0000757409 | 14.9582 |
0.000387262 | 5.81024 |
0.0010059 | 3.31439 |
0.00198007 | 2.20507 |
0.00334828 | 1.59126 |
0.00514314 | 1.20551 |
0.00739319 | 0.941806 |
0.0101241 | 0.75036 |
0.0133591 | 0.604923 |
0.0171197 | 0.490442 |
0.087533 | −0.0269666 |
0.227363 | −0.235092 |
0.447555 | −0.373262 |
0.756814 | −0.483609 |
1.16251 | −0.579447 |
1.67109 | −0.666391 |
2.28835 | −0.74727 |
3.01956 | −0.823696 |
3.86958 | −0.896673 |
Material Properties | Value |
---|---|
Density (kg/m3) | 2750 |
Young’s modulus of elasticity, (Gpa) | 70 |
Poisson’s ratio, | 0.3 |
Inelastic heat fraction, | 0.9 |
Specific heat, (J/kgK) | 910 |
Proof/Yield stress, (Mpa) | 215 |
Strain hardening coefficient, (Mpa) | 280 |
Strain hardening coefficient, | 0.404 |
Strain hardening coefficient, | 0.0085 |
Thermal softening constant, | 0.859 |
Reference strain rate, (s−1) | 0.001 |
Reference temperature, (K) | 293 |
Melting temperature (K) | 893 |
0.096 | |
0.049 | |
3.465 | |
0.016 | |
1.099 |
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Yang, H.; Gao, D.; Chen, P.; Lu, G. Numerical Investigation on the Ballistic Performance of Semi-Cylindrical Nacre-like Composite Shells under High-Velocity Impact. Materials 2023, 16, 3699. https://doi.org/10.3390/ma16103699
Yang H, Gao D, Chen P, Lu G. Numerical Investigation on the Ballistic Performance of Semi-Cylindrical Nacre-like Composite Shells under High-Velocity Impact. Materials. 2023; 16(10):3699. https://doi.org/10.3390/ma16103699
Chicago/Turabian StyleYang, Huiwei, Dongyang Gao, Pengcheng Chen, and Guoyun Lu. 2023. "Numerical Investigation on the Ballistic Performance of Semi-Cylindrical Nacre-like Composite Shells under High-Velocity Impact" Materials 16, no. 10: 3699. https://doi.org/10.3390/ma16103699