Purpose – The purpose of this paper is to analyse the dynamic behaviour of an elasto‐plastic sandwich subjected to low velocity impact. Design/methodology/approach – A numerical model is developed with the assumption that the plastic deformation is confined under the contact area. The structure is analyzed …

In the case of the 2016 HO impactor, this paper conducts numerical Monte-Carlo simulations for validation. The results are encouraging, and the proportion of …

the impactor diameter over the bead diameter d/dg is always larger than 10, allowing to describe the medium in the limit of continuum mechanics [39]. Note that d z N z 0 r D m i h m 0 250 200 150 100 50 z N (mm) 0 25 50 75 N 100 125 300 200 100 50 30 z N (mm) 10 0 10 1 N 10 2 1/3 impactor granular medium (b) (a) Figure 1. (a) Sketch of the ...

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Nuair a chinneann an cigire nach bhf uil ceann de na seiceálacha curtha i bhfeidhm go hiomlán ag an scoil, bíonn tráchtaireacht bhreise ar an seiceáil sin sa tuairisc. Moltar freisin bearta ba cheart don scoil a ghlacadh chun an treoir atá curtha ar fáil a chur i …

Recent advances in Graded Density Impactor fabrication technique have increased the maximum achievable pressure in gas gun quasi-isentropic experiments to …

d2z dt2 = −mg +Fd, (1) where m is the mass of the impactor, z is the displace-ment of the lowest point on the object below the initial free surface of the grains, g is the gravitational accelera-tion, and Fd is the drag force due to the presence of the granular medium. Impact models typically represent the drag force as the sum of two terms ...

The impact analysis of the glass fiber-reinforced polyamide showed that the impactor velocity has considerable effects on the impact response of the composite plates. Also, the contact force ...

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The present study sought to apply graded-density impactor methods for producing isentropic loading to planar impact experiments to selected such problems. Cerium was chosen due to its 20% compression between 0.7 and 1.0 GPa. A model was constructed based on limited earlier dynamic data, and applied to the design of a suite of …

Ping An Insurance (Group) Co. of China Ltd. -3.27%. $105.25B. BHF | Complete Brighthouse Financial Inc. stock news by MarketWatch. View real-time stock prices and stock quotes for a full financial ...

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Equations – constitute a linear solution to the response of the system under consideration, i.e., given the initial velocity and acceleration time history of the impactor (v 0 and a), and the control point acceleration (u), the motion of the dummy (X), the control points (Y) and the impactor (Z) can be obtained with linear transformations.

We consider the penetration dynamics of a vertical cylinder into a dry granular medium subjected to successive impacts. The depth of the impactor below the free surface z N first evolves linearly with the impact number N and then follows a power-law evolution z N ∝ N 1 / 3.The depth reached by the cylinder after a given number of …

respectively the mass of the hy brid plate and the impactor, z 1. and z 2 are respectively the relative displacements of the hybrid . plate and the impactor masses. K 1 = K bs is the bending-shear .

The Zefon A6 Bioaerosol Impactor is a single stage bioaerosol impaction sampler for the viable sampling of mold and fungi. Item Number: Z-A6. Manufacturer: Zefon International. Availability: In Stock. Price:$479.50. Overview. Product Questions or Comments. The Zefon A6 is a single stage bioaerosol impaction sampler for the viable sampling of ...

The depth of the impactor below the free surface z N first evolves linearly with the impact number N and then follows a power-law evol ution z N ∝ N 1 / 3 . The depth reached

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Successive snapshots of the impactor in a quasi-two-dimensional projection, where the black dashed lines mark the maximum penetration, white solid line is the …

impacts. The depth of the impactor below the free surface z N first evolves linearly with the impact number N and then follows a power-law evolution z N ∝ N1/3. The depth reached by the cylinder after a given number of impacts is observed to increase with the impact energy, but to decrease with its diameter and the density of the granular ...

FIG. 1. Successive snapshots of the impactor in a quasi-two-dimensional projection, where the black dashed lines mark the maximum penetration, white solid line is the impactor …

Ejection Mitigation Problem Definition z52,900 Ejections per Year – 1% of all crash-involved occupants z10,300 Ejected Fatalities per Year – 32% of all fatalities – 6,000 through side windows z10,600 Rollover Fatalities per Year – 3,800 ejected through side windows

The depth of the impactor below the free surface z N first evolves linearly with the impact number N and then follows a power-law evol ution z N ∝ N 1 / 3 . The …

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DOI: 10.1016/j.ijimpeng.2019.103498 Corpus ID: 213793621; Effect of Lode angle incorporation into a fracture criterion in predicting the ballistic resistance of 2024-T351 aluminum alloy plates struck by cylindrical projectiles with different nose shapes

B. Equation of motion of impactor The equation of motion for a free-falling impactor along z−direction of the center of mass zI, and the deep-est point of the impactor z := zI −aI …

The equation of motion is as follows, as discussed before by the author [21]: m 2 z ¨ 2 + F = 0 m 1 z ¨ 1 + K bs z 2 + K m z 2 3 − F = 0 where F is the contact force, m 1 and m 2 represents, respectively, the mass of the hybrid plate and the impactor, z 1 and z 2 are, respectively, the relative displacements of the hybrid plate and the ...