Penetration into semi-infinite reinforced-concrete targets with spherical and ogival nose projectiles

Luk, V.K.; Forrestal, M. J.

doi:10.1016/0734-743x(87)90096-0

Cited by 133 publications

(75 citation statements)

References 4 publications

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“…For example, Ref. [28][29][30][31][32] used friction coefficient =0.02-0.10 for the penetration of high strength steel projectile in concrete and aluminum targets. It was also mentioned in [33] that friction can be neglected in high velocity penetration study because local melting normally happens on the interface which largely reduces the friction.…”

Section: Discussionmentioning

confidence: 99%

Trajectory instability and convergence of the curvilinear motion of a hard projectile in deep penetration

Gao

2017

International Journal of Mechanical Sciences

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Section: Discussionmentioning

confidence: 99%

Trajectory instability and convergence of the curvilinear motion of a hard projectile in deep penetration

Gao

2017

International Journal of Mechanical Sciences

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“…These experiments were repeated for ogive nose penetrators with "Caliber-radiusheads" of 0.5, 3.0, and 4.25. Recall that "Caliber-radius-head" refers to the ratio of ogive radius to diameter (e.g., see [5] or [9]). …”

Section: Penetration Of a Confined Particulate Targetmentioning

confidence: 99%

“…The details that lead to eqn (3), along with eqns (4)- (6), have been sparingly presented. The reason for this is that they have appeared earlier (e.g., see Luk and Forrestal [5] and Jones et al [9]). The purpose of this paper is to add an additional force.…”

Section: Penetration Of a Confined Particulate Targetmentioning

confidence: 99%

“…This may include an increase in the average density, as the target material may become compacted in the process. This process of compaction has been used as a modelling tool [4], although the conventional approach to modelling this process is by cavity expansion methods (e.g., Luk and Forrestal [5]). All of these analyses lead to a velocity-squared pressure of the form…”

Section: Penetration Of a Confined Particulate Targetmentioning

confidence: 99%

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Penetration of a coarse sand target by rigid projectiles

Hankins¹,

Stoltz²,

Torres³

et al. 2006

WIT Transactions on the Built Environment, Vol 87

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This paper presents a theory for the normal rigid body penetration of particulate media. This theory consists of two separate force regimes divided by a critical velocity at which the transition between the two regimes takes place. Also included in this theory is sliding friction, separated into two different regimes, one for the nose and one for the shank.In order to verify this new penetration theory, a set of laboratory experiments was performed where 7075-T6 Aluminum projectiles were shot into coarse foundry sand. Utilizing the total penetration depth and impact velocity of each projectile in the test, along with known projectile geometry, analyses of the penetration events were completed. The results of these experiments and analyses, which confirm the required use of a friction coefficient on the shank, are reported.

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“…Split a mechanics theory according to the rock, when the crack carries a department is bigger than a rock dynamic state to split a tenacity in response to the dint strength factor start to start crack expanding, whereas then crack [2]. Therefore, for picture 1 show a typical type crack problem, rise crack to judge according to BE:…”

Section: Break Loose Move the Formation Of The Area And The Assurancementioning

confidence: 99%

Analysis on the Length of Rock Bolt with Underground Works under Explosion Load

Luo¹,

Zhang²,

Yong³

2017

dtetr

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Keywords: Explosive stress wave, The surrounding rock of tunnel segment bearing dynamic load, Anchoring support parameters.Abstract. In this paper based on the explosive stress wave theory, the mechanism for the broken rock zone's formation and the character of the surrounding rock's disfeature under blast loads are analyzed. On the basis of these works, the surround rock's dynamic broken rock zone calculation formula is derived and for the anti-explosion reinforcement to the surrounding rock of tunnel segment bearing dynamic load is locked. In addition, the author also calculated and analyzed separately the necessary length of rock bolt for the reinforcement, consider of the first type to the forth type surrounding rock, different vertical critical explosion distance, different span. The curves are obtained between the length of rock bolt for the anti-explosion reinforcement of the surrounding rock and three factors are included: the span of underground opening, type of the surrounding rock, the distance between the center of charge and the vault. PrefaceBehind the underground hole, room opens to dig, periphery round a rock to break the creation loose move, thus the blowout that forms certain thickness is loose to move area. Is loose to move area under two functions of explosion wave, will result in loose move the crack extension in the area to expand, will may cause close together crack each other conjunction master to form bigger crack, turned worse in response to the breakage effect of dint wave, strengthened earthquake to fall destructive effect, biggest weakened a rock body anti-to move to carry loading ability and stability. This text mainly studies explosion wave function next shallow cover up hole of room reasonable anchor man solid depth, raise underground tunnel hole. Thus the room is in the explosion wave under the function of existence ability. Break Loose Move the Formation of the Area and the Assurance of the ThicknessLie quality but talk to majority of rocks, play a body to pack a medicine explosion first formation explosion cavity, arise to pound at wave in the rock body, formation smash area, and then the energy significantly reduces, is smashing area outside and changing into in response to the dint wave, press in response to the dint wave continue in the rock body follow path to dissemination result in rock body path to is press, sliced to is pulled, thus formation crack area.According to the Oval crack theory of N. I. Muskhelishvihi[1], use one length half stalk's imitating crack for the being subjected to of oval bore dint circumstance of a, b is pulled to press to shear etc. to carry on treatise in response to the compound function of dint.Establish at broken loose move the area R point, the rock body has a long for 2a as of beginning start tiny crack, BE is exploded in response to dint wave produce of press a function in response to the dint field, develop to pull in response to the dint in the crack full general creation part (such as figure 1 show).

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Penetration into semi-infinite reinforced-concrete targets with spherical and ogival nose projectiles

Cited by 133 publications

References 4 publications

Trajectory instability and convergence of the curvilinear motion of a hard projectile in deep penetration

Trajectory instability and convergence of the curvilinear motion of a hard projectile in deep penetration

Penetration of a coarse sand target by rigid projectiles

Analysis on the Length of Rock Bolt with Underground Works under Explosion Load

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