High-velocity impact of low-density projectiles on structural aluminum armor

Sorensen, Brett R.; Kimsey, Kent D.; Love, Bryan

doi:10.1016/j.ijimpeng.2008.07.077

Cited by 12 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another field of interest for ductile failure models (and also under intense investigation) is plate penetration and plugging in ballistic problems [109,143]. Most work on terminal ballistics has been based on the Johnson-Cook fracture criterion [110,143,144,145,146,147,148,149,150]. Sorensen…”

Section: Dynamic Strength and Fracturementioning

confidence: 99%

A review on the strain rate dependency of the dynamic viscoplastic response of FCC metals

Salvado

Teixeira-Dias

Walley

et al. 2017

Progress in Materials Science

View full text Add to dashboard Cite

The response of structures and materials subject to impulsive loads remains a field of intense research. The dynamic loading and temperature increase affect the material's mechanical/failure response. For example, strains due to explosive blast will increase at rates from 102 to 104 s-1, leading to regimes of elastic/plastic wave propagation, plane stress and adiabatic deformations. Few constitutive models consider high strain rate effects, however some constitutive approaches that were developed and tested at low strain rate regimes will also be addressed here due to their relevance. Specific reference will be made to strain rate regimes close to 104 s-1, where shock waves may develop. The paper focuses on constitutive models for polycrystalline face-centred-cubic (FCC) metals since their behaviour under high strain rate regimes is not yet fully understood mostly due to path loading dependency. Reference is also made to aluminium alloys since they are widely used in virtually all fields of industry and in armour and protective structures and systems. A basic review of the main theoretical aspects that constitute the basis for most of the constitutive models described is also presented and the main features of each model are thoroughly discussed.

show abstract

Section: Dynamic Strength and Fracturementioning

confidence: 99%

A review on the strain rate dependency of the dynamic viscoplastic response of FCC metals

Salvado

Teixeira-Dias

Walley

et al. 2017

Progress in Materials Science

View full text Add to dashboard Cite

show abstract

“…In recent years, some researchers have studied the cavity changes of projectiles when the projectiles navigate in regions of different liquid density (Fan et al 2019). Some researchers have also proved that density is an important factor in materials and has a certain influence on the range and power of projectile ， both experimentally and theoretically (Forouzani et al 2018;Sorensen et al 2008;Wang et al 2020;Zhang et al 2021). It seems clear that studying the effect of projectile density on the performance of supercavitating projectiles will increase scientific understanding of high-speed entry into water.…”

Section: Introductionmentioning

confidence: 99%

Influence Rule of Projectile Density on the Characteristics of High-Speed Water-Entry Cavity

2022

JAFM

View full text Add to dashboard Cite

There has been much recent research on high-speed projectiles entering water, but research on the selection of the material for supercavitating projectiles is limited. Some important properties of such projectiles-mass and moment of inertia, for example-are related to the material density, so the projectile's density has an important effect on the performance of the supercavitating projectile. This study, using Ansys fluent 19.0 simulation software, studied the details of water entry of four high-speed projectiles of the same shape but made of different materials: aluminum (2.7 g/cm 3 ), steel (7.85 g/cm 3 ), brass (8.5 g/cm 3 ), and tungsten alloy (17.5 g/cm 3 ). The cavity shape, ballistic and hydrodynamic characteristics, and cavity flow field characteristics of projectiles with different densities were analyzed for a water-entry velocity of 600 m/s. The results show that within 3 ms, the velocity of a projectile with a density of 2.7 g/cm 3 drops to 171.8 m/s, and the velocity of a projectile with a density of 17.5 g/cm 3 drops to 433.1 m/s. Increasing the density of the projectile evidently reduces the deceleration of the projectile. The drag coefficient depends, primarily on the size and shape of the projectile, only slightly on its density. Just after water-entry time, the higher the density of the projectile, the faster the expansion of its cavity wall. As time after water entry increases, the expansion velocity of the cavity wall gradually decreases. The simulation results show that the projectile head experiences the greatest pressure, producing a sharp peak, at the moment when it touches the water surface. During the flow stabilization phase, the lower the density of the projectile, the lower the pressure on the head of the projectile. The results of this study will help to guide the selection of material for supercavitating projectiles.

show abstract

“…Many studies on formulations and fabrications [3], mechanical properties [4], impact initiation [5], and energy release characteristics [6] have been conducted based on theoretical analysis, numerical simulation, and experiments. However, PTFE-Al materials have limitations in application due to the low material strength and density [7].…”

Section: Introductionmentioning

confidence: 99%

Impact-Initiation Sensitivity of High-Temperature PTFE-Al-W Reactive Materials

et al. 2021

View full text Add to dashboard Cite

Drop-weight tests were conducted to investigate the impact-initiation sensitivity of high-temperature PTFE-Al-W reactive materials. The test results show that the impact-initiation sensitivity of the materials more than doubles with increasing the sample temperature from 25 to 350 °C. Combined with the impact-induced initiation process recorded by high-speed video and the difference between reacted and unreacted residues, the crack-induced initiation mechanism was revealed. The rapid propagation of crack provides a high-temperature and aerobic environment where Al reacts violently to PTFE, which induces the initiation. Moreover, the influence of sample temperature on the sensitivity was discussed and analyzed. The analysis results indicate that the sensitivity shows a temperature interval effect, and 127 and 327 °C are the interval boundaries where the sensitivity changes significantly. The sensitivity may leaps at 127 °C and increases more rapidly in the temperature interval from 127 to 327 °C, but hardly changes after the temperature reaches 327 °C.

show abstract

High-velocity impact of low-density projectiles on structural aluminum armor

Cited by 12 publications

References 5 publications

A review on the strain rate dependency of the dynamic viscoplastic response of FCC metals

A review on the strain rate dependency of the dynamic viscoplastic response of FCC metals

Influence Rule of Projectile Density on the Characteristics of High-Speed Water-Entry Cavity

Impact-Initiation Sensitivity of High-Temperature PTFE-Al-W Reactive Materials

Contact Info

Product

Resources

About