Analysis of failure of add-on armour for vehicle protection against ballistic impact

Gálvez, V. Sánchez; Paradela, Laura Sánchez

doi:10.1016/j.engfailanal.2008.09.007

Cited by 33 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The numerical simulation of phenomena involving ballistic impact into composite armours provides a great amount of information (such as stress, strain, velocity histories, damage extension, erosion, crater dimensions). However, a numerical simulation is a difficult task especially when advanced materials are involved, due to the lack of reliable models of materials behaviour, particularly in the context of fracture criteria and post-failure behaviour [2].…”

Section: Introductionmentioning

confidence: 99%

Analytical and numerical simulations of ballistic impact on composite lightweight armours

Sánchez‐Gálvez¹,

Paradela²

2014

Projectile Impact

View full text Add to dashboard Cite

This paper summarizes the utilization of analytical and numerical computation as valuable tools for lightweight armour design optimisation. Several analytical models for ballistic impact simulation onto composites and ceramic faced targets have been developed at our department. This paper shows a few examples of the utilization of those models as well as numerical computations using commercial hydrocodes.

show abstract

Section: Introductionmentioning

confidence: 99%

Analytical and numerical simulations of ballistic impact on composite lightweight armours

Sánchez‐Gálvez¹,

Paradela²

2014

Projectile Impact

View full text Add to dashboard Cite

show abstract

“…This approach is also useful for optimisation design of the fabric in particular and the ballistic armour in general. 3 The fabric is numerically simulated at the macroscopic, mesoscopic, and microscopic scales. The macroscopic, macro-mesoscopic multi-scale, and mesoscopic models have already been successfully developed.…”

Section: Introductionmentioning

confidence: 99%

Mechanical performance and failure analysis of a fabric subjected to ballistic impact using multi-scale numerical modelling

Pham

Long

Imad

2023

Journal of Composite Materials

View full text Add to dashboard Cite

In this paper, multi-scale numerical modelling analysis is proposed to study the ballistic responses of a Kevlar KM2 woven fabric. Three meso-microscopic multi-scale numerical models are conducted by varying the number of microscopic primary yarns in the impact zone from 2 to 10. In each model, we analyse the evolution of the contact force, the projectile velocity and the fabric energies. An analysis of the failure modes of each configuration is also performed. Results of the three multi-scale models and a mesoscopic model are compared in order to find the optimal number of microscopic primary yarns to predict the fabric’s ballistic behaviour. It is highlighted that the multi-scale model consumes a reasonable computation cost. Furthermore, with the primary yarns modelled in the fibre scale, this model can fully describe the complex physical phenomena, such as fibre failure and the interaction between fibres, fibres and yarns, that occur during the impact.

show abstract

“…Ceramic materials have played an important part in ballistic protection. Utilization of ceramics in armor application began in the 1960s in US Army for bullet-proof vests and seat-armor in helicopters [16,17]. As effective protection and low weight are two main criteria in ballistic armor materials, high hardness and low density make ceramics ideal candidates for this technology.…”

Section: Ceramic Armor Systemsmentioning

confidence: 99%

“…Four ballistic impact tests performed by Gálvez and Paradela [16] are firstly simulated to determine valid numerical simulation and material parameters. In each test, a 20 mm armor-piercing discarding-sabot (APDS) projectile impacted at the nominal impact velocity of 1240 m/s and perforated a bi-layer armor composed of Al 2 O 3 99.5% front plate and aluminum 5083-H111 backing plate.Equation Chapter (Next) Section 1 The geometric parameters of the two plates, projectile residual velocity and residual length obtained from experimental measurements [16] and current simulations are listed in Table 3.1. Two-dimensional (2D) axisymmetric simulations of these four tests were performed using AUTODYN ® .…”

Section: Numerical Modellingmentioning

confidence: 99%

“…It is shown that pressure below and near to the impact site of the confined ceramic target at the locations where damage initiates is important in the transition behavior from dwell to penetration for targets of various pre-stress states and of different pre-stress ratios. [110] .............. 30 Figure 2.7 Different forms of damages under the impact site of the polished SiC cross section recovered from impact of long rod tungsten projectile: (a) of 3.175 mm diameter and 1149 m/s impact velocity [111] and (b) 6.35 mm and 1600 m/s impact velocity [112] [114] in impact of a fluid jet with velocity V 0 : (a) during the initial stages of the jet impact, the target surface is flat and the fluid spreads laterally and (b) as the jet deforms the target and penetrates a depth of δ into the target, it creates a dimple at the impact site; from the work of Uth and Deshpande [114] 6.7 Original projectile and the one at the end of the impact obtained from the impact experiments performed by Reijer [23] using blunt projectile of different impact velocities (V 0 ) onto high purity alumina-aluminum alloy 6061-T6 armor composed of fixed 8.1 mm front plate thickness (T 1 ) and different backing plate thicknesses (T 2 ) .. 119 Figure 6.8 Comparison of the results obtained from current model and experimental measurements [166] for blunt projectile impact with different velocities on high purity alumina-aluminum alloy 6061-T6 armor composed of 8.1 mm front plate thickness and backing plate thickness of: Wilkins [162] reported by Anderson Jr and Walker [25] Table 2.1 Projectile characteristics [13] 3.1 Comparison of the current simulation results, for 20 mm APDS impacting bilayer alumina-aluminum armors, with experimental results [16] ................................. 36 Table 3.2 JH-2 material constants for Al 2 O 3 99.5% in the simulations [31] ................. 38 Table 3.3 Material constants for tungsten alloy and aluminum 5083-H116 [38,122] ... 38 Table 3.4 Constants of Lambert-Jonas equation [65] (Eq. (2.22)) obtained in the current work for curve fitting in Figure 3 [138,…”

mentioning

confidence: 99%

See 1 more Smart Citation

Modelling and analysis of bi-layer ceramic–metal protective structures

Serjouei¹

View full text Add to dashboard Cite

Technical ceramics due to their high specific hardness and compressive strength under pressure loading are attractive materials for armor structures. However, the low toughness of the ceramics is limiting their usage in practical designs. Adding a strong and tough plate at the back of the ceramic plate such as metal or polymer composite laminate, is one of the states of the art armor design that is extensively studied by researchers. Due to the cost of field experiments in defense industry, development of analytical, numerical/empirical models to estimate the ballistic velocity of armor systems by considering geometry of the projectile and target structure is gaining importance. Optimization of the armor design for either weight or thickness is also an important criterion. Furthermore, improving the toughness of the ceramic employing different means like adding metallic phases or pre-stressing them is of considerable interest.In the present thesis, a semi-analytical model is presented for impact of flat-ended (blunt) hard projectiles against ceramic-metal armor. Comprehensive numerical simulations are performed based on which it is shown that the projectile residual velocity and BLV satisfy the replica scaling laws. An empirical equation for the BLV is proposed whereby the influence of projectile and armor geometrical parameters on the BLV is explored.Experimental work is performed for validating the proposed semi-analytical model on alumina-aluminum armor system. A numerical model is then developed through matching with experimental results based on which variation of the length of the projectile with time and also with front plate and backing plate thicknesses is found.A generalized empirical model to estimate the BLV, as a function of geometrical and material parameters for ceramic-metal bi-layer armor systems impacted by a blunt projectile, is proposed. Comparison between results obtained from the empirical model for the BLV of ceramic-metal armor impacted by blunt projectiles, with the available experimental data is carried out.

show abstract

Analysis of failure of add-on armour for vehicle protection against ballistic impact

Cited by 33 publications

References 6 publications

Analytical and numerical simulations of ballistic impact on composite lightweight armours

Analytical and numerical simulations of ballistic impact on composite lightweight armours

Mechanical performance and failure analysis of a fabric subjected to ballistic impact using multi-scale numerical modelling

Modelling and analysis of bi-layer ceramic–metal protective structures

Contact Info

Product

Resources

About