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Chao Kong

Chinese researchers say they have developed a crocodile-inspired ceramic body armour that can deflect projectiles and potentially offer a low-cost alternative for lightweight ballistic protection.
The team – led by associate research fellow Zhaoxiu Jiang at Ningbo University – based their design on the asymmetric, overlapping scales of crocodile skin, which provide a protective barrier against predators and other crocs.
Their research findings were published on March 25 in the peer-reviewed Chinese journal Acta Armamentarii.
“The asymmetric structure can indeed cause projectile deflection – that is an experimentally verified result,” Jiang said in an interview.
Instead of the conventional hexagonal ceramic tiles common in composite armour, the team built a mosaic of diamond-shaped alumina ceramic units arranged at 45-degree angles, bonded with epoxy resin onto an aluminium alloy backing plate.
Ceramic materials were used due to their hardness, high compressive strength and low density.
The researchers said the armour was designed for personal protection, armoured vehicles and armed helicopters.
“The project was designed from the outset with manufacturing simplicity in mind,” Jiang said. “If a structure is too difficult to process or assemble, then there is little practical meaning in making it.”
In testing, the crocodile-scale layout consistently outperformed traditional hexagonal armour against hardened steel projectiles designed to mimic armour-piercing rounds.


“With the same materials, if structural optimisation improves performance, then naturally the cost can come down,” Jiang said. “This structure is relatively simple, so large-scale production could make it cheaper.”
The test projectiles were ultra-high-strength martensitic steel – akin to materials used in kinetic penetrators.
Across impact speeds from 260 to 1,000 metres per second, the crocodile-scale armour was found to reduce residual velocity more effectively than the hexagonal layout.
At roughly 550 metres per second, a 6-degree tilt prolonged dwell time and accelerated break-up; residual mass fell from 32.17 grams to 22.47 grams at higher speeds. No backing plate was fully penetrated, rear-face deformation was markedly lower and the ceramic layer absorbed nearly 8.8 percentage points more impact energy.
But Jiang said the armour’s advantages were most pronounced within a certain velocity window.
“If the speed becomes too high, the effect will also decline,” he said, adding that the structure would probably be effective against some types of armour-piercing ammunition, though performance would still depend on the specific projectile design.
The system remains at the laboratory stage. Future work is expected to focus on multi-angle live-fire testing, repeated impacts and large-area engineering integration.
Beyond personal body armour, the researchers believe the design could find applications in vehicle and helicopter protection, naval shielding and even lightweight aerospace or deep-sea structures that require impact resistance.
“We are simply trying to do solid work,” Jiang said. “What we care about most is whether the cost can really be reduced so that it can eventually be used in real applications.”


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Diamond-shaped ceramic tiles arranged at 45-degree angles could be used for body armour, vehicles and armed helicopters, researchers say


Diamond-shaped ceramic tiles arranged at 45-degree angles could be used for body armour, vehicles and armed helicopters, researchers say.


Inspired by crocodile scales, Chinese armour tech said to deflect projectiles

.css-1c6uqr6{color:inherit;font-weight:inherit;font-size:inherit;font-family:inherit;line-height:inherit;overflow-wrap:break-word;}Diamond-shaped ceramic tiles arranged at 45-degree angles could be used for body armour, vehicles and armed helicopters, researchers say

Diamond-shaped ceramic tiles arranged at 45-degree angles could be used for body armour, vehicles and armed helicopters, researchers say