Penetration mechanics of yawed rods

Bless, Stephan; Barber, J.P.; Bertke, Robert S; Swift, H. F.

doi:10.1016/0020-7225(78)90068-x

Cited by 27 publications

(10 citation statements)

References 6 publications

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“…Macro-cracks just in front of penetrators as suggested by [9] and [5] were not produced in the material studied here. Ra- dial crack traces on impact surface are very straight along radial from impact site.…”

Section: Discussionmentioning

confidence: 71%

“…In order to study penetration dynamics, a number of researchers ( [19], [22], [15], [28], [8], and [32]) have attempted to measure penetration depth, velocity, and deceleration time history during penetration. The measurement methods employed include: High-speed photography to measure penetration depth-time history ([19], [22] and [32]); Laser Doppler anemometry to determine projectile velocity-time history ( [31]); On-board accelerometers to record deceleration time history ( [15], [28], and [8]); and Reversed experiments to measure strain, stress and particle velocity in projectile materials ( [5]). The understanding of rigid penetration into various soft materials (soils, clays, sands and soft rocks like tuff) has been improved using on-board instrument measurements combined with numerical simulation ( [4], and [13]) because of low resistance force and no crack generation during penetration.…”

Section: List Of Figuresmentioning

confidence: 99%

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Shock-Induced Damage in Rock and Concrete

Liu¹,

Ahrens²

1999

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REPORT DOCUMENTATION PAGE &ik>fcTh. r*M\r r»nnrtino burden tor this collection of informetion is estlmeted to «verso» 1 hour par response. Indui J«h.ÄÄÄ «»",, """. ,", , 2302/CX5f. WORK UNIT NUMBER PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)California Institute DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release J distribution unlimited. PERFORMING ORGANIZATION REPORT NUMBER SPONSOR/MONITOR'S ACRONYMIS) SPONSOR/MONITOR'S REPORT NUMBER(S) SUPPLEMENTARY NOTES14 ABSTRACT We have developed a technique for measuring the depth time history of rigid body penetration into brittle • materials under a deceleration of -10 5 g. A series of 4140 steel projectile penetrations into G-mixture mortar targets has been conducted in the velocity range of 100 to 500 m/s. Based on the experimental results, the target materials are damaged via compacting and brittle radial and lateral crack propagation in front of and surrounding the penetration path. The projectiletarget contact length on the projectile lateral surface is <20% of final penetration depth. This suggests that the effect of lateral friction on the penetration process can be ignored. Final penetration depth is found to be linearly scaled with initial projectile energy per unit cross-section area. Based on the fact that the penetration duration increases slowly with impact velocity, does not approximately depend on projectile. Deduced penetration velocity-time histories suggest that the whole penetration is divided into three stages: an initial stage, a steady penetration stage and a penetration stop stage. The average deceleration m the steady penetration stage for projectiles with the same dimensions is found to be linearly proportional to initial impact velocity. The average resistance pressure during penetration is estimated to be comparable to shock wave pressure. The present data demonstrate that a very strong similarity of penetration depth-time history is described by a relation between normalized penetration depth and normalized penetration time. This similarity can be used to predict penetration depth-time history under different initial projectile conditions.

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Section: Discussionmentioning

confidence: 71%

Section: List Of Figuresmentioning

confidence: 99%

Shock-Induced Damage in Rock and Concrete

Liu¹,

Ahrens²

1999

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“…For this purpose, various expérimental data for this kind of impacts are collected from thé existing literature [9,10,[24][25][26][27][28]. For instance, a mechanical model is developed in order to calculate thé pénétration depth for given ranges of thé projectiles velocities: for instance, Bless [9], corresponds to a velocity of almost 2.15km/s.…”

Section: Figure 9: Trajectory Of Thé Fragmentmentioning

confidence: 99%

“…For instance, a mechanical model is developed in order to calculate thé pénétration depth for given ranges of thé projectiles velocities: for instance, Bless [9], corresponds to a velocity of almost 2.15km/s. Many other models hâve also been developed and compared to thé expérimental data, Neilson [28], BRL and SRI models, [10,24].…”

Section: Figure 9: Trajectory Of Thé Fragmentmentioning

confidence: 99%