Blast and Ballistic Loading of Structures

Hetherington, J.G.; Smith, Peter

doi:10.1201/9781482269277

Cited by 81 publications

(57 citation statements)

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“…Loadings from detonations can be idealized as linearly decaying, exponentially decaying, concave, and rectangular pulse shapes [11], The idealized pulse load, P(x,t), starts with its maximum value, f ", (e,g,, maximum value of uniformly distributed load on length L), and descends to zero at time t¿ in the case of linear, exponentially decaying or concave pulses. This illustrates the basic feature of a uniformly distributed blast load (detonation) on the structure if the negative pressure phase is neglected [2], Figure 4 illustrates the normalized pulse shapes. Equation (24) shows the various pulse time histories written as a single general equation using values of r\ and T from Table 3,…”

Section: Loadingsupporting

confidence: 87%

“…Damage occurs when y^^ reaches the critical deflection level (previously defined or agreed upon) of the structure, y^-A pressure-impulse {P-P) diagram is an isodamage curve based on the maximum response criterion (which can be stress, displacement, moment, rotation, reaction force, etc.) for the system which is represented in the space of nondimensional pressure and impulse of pulse loading [2,3]. P-I diagrams are thus used to assess the level of damage in structures.…”

Section: Introductionmentioning

confidence: 99%

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Pressure-Impulse Diagrams for Blast Loaded Continuous Beams Based on Dimensional Analysis

Fallah¹,

Nwankwo²,

Louca

2013

Journal of Applied Mechanics

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This paper studies pulse loading shape effects on the dynamic response of continuous beams. The beam is modeled as a single span with symmetrical semirigid support conditions. The rotational spring can assume different stiffness values ranging from 0 (simply supported) to oo (fully clamped). An analytical solution for evaluating displacement time histories of the semirigidly supported (continuous) beam subjected to pulse loads, which can be extendable to very high frequency pulses, is presented in this paper. With the maximum structural deflection, being generally the controlling criterion for damage, pressure-impulse diagrams for the continuous system are developed. This work presents a straightforward preliminary assessment tool for structures such as blast walls utilized on offshore platforms. Eor this type of structures with semirigid supports, simplifying the whole system as a single-87-92) to eliminate pulse loading shape effects on pressureimpulse diagrams would be very conservative and cumbersome considering the support conditions. It is well known that an SDOF model is a very conservative simpliflcation of a continuous system. Dimensionless parameters are introduced to develop a unique pulse-shape-independent pressure-impulse diagram for elastic and elastic-plastic responses of continuous beams.

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Section: Loadingsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Pressure-Impulse Diagrams for Blast Loaded Continuous Beams Based on Dimensional Analysis

Fallah¹,

Nwankwo²,

Louca

2013

Journal of Applied Mechanics

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“…Hard armor systems typically consists of multiple layers, with a ceramic or ceramic composite plate at the strike face, backed with a ductile material such as ballistic steel or aluminum, or a high performance fiber reinforced composite. This hybrid arrangement of layers allows the armor system to defeat the projectile upon impact, with the ceramic layer blunting and eroding the projectile due to its high hardness, and the more ductile/high tensile backing plate absorbing the residual kinetic energy of the fractured or deformed projectile through plastic deformation [1]. A variety of armor options are already available, however each one has its own limitations restricting their widespread use in many applications.…”

Section: Introductionmentioning

confidence: 99%

Ballistic performance of composite metal foams

Garcia-Avila

Portanova

Rabiei

2015

Composite Structures

101

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“…The penetration of projectiles into targets involves complex mechanical interactions. By convention [2] the following simplifying definition are adopted. When a projectile enters a target did not passes through it so this projectile it is said 'penetrated'.…”

Section: Penetration and Perforation Projectilesmentioning

confidence: 99%

Investigating projectile penetration of sandwich panels with multiple suppressive cores

Laissy¹,

Attia

Abdelwahab³

2012

WIT Transactions on the Built Environment

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Concrete structures are employed extensively in protective structures. This concept does not guarantee economic benefits to reduce the construction time or cost. An important issue is how the penetration distance will be affected when using sandwich panels with multiple suppressive cores. This paper presents the development of an accurate finite element model using AUTODYN to study the behaviour of different sandwich panels exposed to 23 mm projectile. Concrete and steel are modelled as Lagrangian meshes while air is modelled as Eulerian mesh. Experimental tests and numerical analysis were carried out to examine the penetration depth of the different suppressive cores used. The result of this paper will prove the benefits of using the sandwich panels with multiple suppressive cores in reducing the penetration depth of the 23 mm projectile. Experimental tests will validate the presented models. Further experiments to validate the effect of the steel angles arrangement presented herein will be conducted and reported at a later stage.

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Blast and Ballistic Loading of Structures

Cited by 81 publications

References 0 publications

Pressure-Impulse Diagrams for Blast Loaded Continuous Beams Based on Dimensional Analysis

Pressure-Impulse Diagrams for Blast Loaded Continuous Beams Based on Dimensional Analysis

Ballistic performance of composite metal foams

Investigating projectile penetration of sandwich panels with multiple suppressive cores

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