Kun Liu

• Phd
• Professor (Associate) at Nanjing University of Science and Technology

To analyze the deformation behavior of short glass fiber-reinforced poly-ether-ether-ketone (SGFR-PEEK) under various conditions through numerical simulations, it is crucial to construct a constitutive model that can describe its stress–strain behavior over a wide range of strain rates and temperatures. In this study, quasi-static compression tests...

In order to reduce the ineffective armor-piercing weight of the small caliber armor-piercing projectile, improve combat effectiveness, and reduce the pollution of lead fillers to the environment, a projectile with aluminum filler was proposed. Taking the small caliber armor-piercing projectile as the research object, using explicit dynamic methods...

Due to their limited penetration power, expansion bullets are known for their good effectiveness and less endangerment to bystanders, thereby playing an important role in the fight against terrorism and violence. This study considered 20 bullet configurations with different shape parameters influencing the motion and deformation of 9 mm expansion b...

The behaviour and effects of a spherical fragment penetrating a simulant and those of biological tissue are similar. To accurately describe the interaction between spherical fragments and muscle tissue, this study first discusses the wounding mechanism and establishes a mechanical model considering the effects of strain rate based on the properties...

The destruction forms of soft body armor penetrated by pistol cartridge are analyzed according to the penetration characteristics of pistol cartridge. A motion model of pistol cartridge penetrating into the gelatin target with soft body armor is established by introducing the fiber constitutive model and gelatin elastic model based on the material...

Gelatine is widely used as a soft tissue simulant in physical surrogates for the human body. Historically, gelatine has been used to evaluate penetrating impacts and, more recently, to evaluate blunt impact and blast loading effects on soft tissue. There is a need for material characterisation data across a wide range of strain rates, and appropria...

Gelatin is a popular tissue simulant in biomedical applications. The behavior of a bullet and the effects of penetrating a simulant are similar in biological tissue. In order to accurately describe the interaction between a rifle bullet and muscle tissue, this paper discusses the wounding mechanism and the difference between the Bo Janzon (B-J) mod...

To research the wounding effects of small caliber rifle cartridges, the following cartridges were chosen as the investigated objectives: the 5.56×45 mm NATO, 5.45×39 mm and 5.8×42 mm DBP 87 rifle cartridges. A series of theoretical analyses were performed for the above cartridges on their structural characteristics, performance parameters and motio...

A surface pressure model is presented to study the translational and tumbling motions of rifle bullets penetrating into ballistic gelatin. In the model, it is assumed that each area element is under the action of normal dynamic pressure and material resistance. The resultant force and moment on a projectile are obtained through numerical integratio...

The process of projectiles penetrating ceramic-ultra-high molecular weight polyethylene(UHMWPE) composite targets is divided into two parts: the interaction between the projectile and the ceramic cone and the interaction between the ceramic cone and the backing plate, and the analytical model is set up.Assuming the stress in the plastic flow region...

Ballistic gelatin is used as a stimulant for human tissue in the experimental study of temporary cavity which is an important factor of ballistic injury. To study the motion of temporary cavities, the steel spheres with diameters of 3 mm, 4 mm and 4.8 mm are fired into the gelatin blocks at 650~1000 m/s in the experiments. The movement of temporary...

Based on the 2-D motion model of bullet penetrating gelatin, a function of the drag coefficient, the lift coefficient, the roll moment coefficient and the yaw damping torque coefficient derivative which is related to the bullet shape is established. Based on the 7.62 mm bullet, five kinds of bullets were designed for the penetrating experiment by c...

To research the motion of a bullet into the muscular tissue, the gelatin was used to simulate the muscular tissue. Based on the properties of the gelatin, a two-dimensional motion model was established for the projectile penetrating the gelatin in which reflecting the difference between attack angle and yaw angle. And the bullet motions in the hori...

To improve the mechanical model of the spherical fragments penetrating gelatin including the inertial resistance and the viscosity resistance only, the gelatin resistance is taken into the original model, and a new equation of motion is developed. The correction mechanical model considering three resistances is proposed. Based on the principle of l...

A new method based on surface integral is presented in the research of mechanical mechanism of spheres penetrating gelatin. On the assumption that each wetted area element is applied with dynamic force perpendicular to the surface, frictional force parallel to the surface and material resistance which is a constant, the resultant force applied on s...