scholarly journals Numerical Evaluation of a Light-Gas Gun Facility for Impact Test

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
C. Rahner ◽  
H. A. Al-Qureshi ◽  
D. Stainer ◽  
D. Hotza ◽  
M. C. Fredel
Keyword(s):  
High Velocity ◽  
Numerical Evaluation ◽  
Impact Test ◽  
Experimental Tests ◽  
Reservoir Pressure ◽  
One Stage ◽  
Gas Gun ◽  
Numerical Predictions ◽  
High Velocity Impacts ◽  
Different Types

Experimental tests which match the application conditions might be used to properly evaluate materials for specific applications. High velocity impacts can be simulated using light-gas gun facilities, which come in different types and complexities. In this work different setups for a one-stage light-gas gun facility have been numerically analyzed in order to evaluate their suitability for testing materials and composites used as armor protection. A maximal barrel length of 6 m and a maximal reservoir pressure of a standard industrial gas bottle (20 MPa) were chosen as limitations. The numerical predictions show that it is not possible to accelerate the projectile directly to the desired velocity with nitrogen, helium, or hydrogen as propellant gas. When using a sabot corresponding to a higher bore diameter, the necessary velocity is achievable with helium and hydrogen gases.

scholarly journals OS1709 The getting bigger of one stage gas gun and an impact test

2014 ◽  
Vol 2014 (0) ◽  
pp. _OS1709-1_-_OS1709-2_
Author(s):  
Hidehiro HATA ◽  
Yoshihiro OTANI ◽  
Sayaka ISHIBASHIRI ◽  
Daisuke INAO ◽  
Kazuhito FUJIWARA ◽  
...  
Keyword(s):  
Impact Test ◽  
One Stage ◽  
Gas Gun

WHERE DO GAMES OF INNOVATION COME FROM? EXPLAINING THE PERSISTENCE OF DYNAMIC INNOVATION PATTERNS

2007 ◽  
Vol 11 (01) ◽  
pp. 65-91 ◽  
Author(s):  
SERGHEI FLORICEL ◽  
DEBORAH DOUGHERTY
Keyword(s):  
Theoretical Model ◽  
Knowledge Production ◽  
High Velocity ◽  
Product Innovation ◽  
Innovation Systems ◽  
One Stage ◽  
Innovation Dynamics ◽  
Different Types ◽  
Level Of Knowledge ◽  
Innovation Patterns

This paper contributes to explaining how and why distinct games of innovation emerge by suggesting that games are nested in innovation systems with persistent innovation dynamics. Dominant lifecycle models focus on how innovation systems transit from an effervescent stage, to product innovation, to process innovation, and so on. They propose specific mechanisms and limiting conditions that affect knowledge production and investment to explain these systematic transitions. Building on these models, we rethink the conditions and mechanisms of innovation to suggest that endogenous renewal cycles can re-create the knowledge and funding necessary to maintain innovation systems for long periods in one stage. We take steps towards developing a theoretical model of innovation dynamics that extends the applicability of lifecycle theories and unifies them with emerging views such as high-velocity innovation and hyper-competition. We also describe three possible types of endogenous renewal cycles, each sustaining a different level of knowledge dynamism and enabling different types of games of innovation.

Simulations of High Velocity Impacts of Ice on Carbon/Epoxy Composite Laminates

2014 ◽  
Vol 566 ◽  
pp. 505-510 ◽  
Author(s):  
Jesús Pernas-Sánchez ◽  
José Alfonso Artero-Guerrero ◽  
David Varas ◽  
Jorge López-Puente
Keyword(s):  
Mechanical Behavior ◽  
High Velocity ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Experimental Tests ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Wide Range ◽  
High Velocity Impacts ◽  
The Impact

In this work simulations of high velocity impacts of ice spheres on carbon/epoxy laminates are accomplished. The Drucker-Prager model has been chosen to describe the mechanical behavior of the ice under high velocity impact conditions. Results have been validated by means of experimental tests performed in a wide range of impact velocities. The delaminated area was chosen as comparison variable, and reflects that the model predicts adequately the impact process.

Numerical evaluation of the thermal performance of different types of double glazing flat-plate solar air collectors

Energy ◽  
2021 ◽  
pp. 121087
Author(s):  
C.Q. Chen ◽  
Y.H. Diao ◽  
Y.H. Zhao ◽  
Z.Y. Wang ◽  
T.T. Zhu ◽  
...  
Keyword(s):  
Flat Plate ◽  
Thermal Performance ◽  
Numerical Evaluation ◽  
Different Types

Combined Craniofacial and Skull-Base Injuries—New Advances

1995 ◽  
Vol 112 (5) ◽  
pp. P144-P144
Author(s):  
Joram Raveh ◽  
Jon B. Turk
Keyword(s):  
Skull Base ◽  
High Velocity ◽  
Stage Management ◽  
Educational Objectives ◽  
New Methods ◽  
One Stage ◽  
High Velocity Trauma

Educational objectives: To become acquainted with the multiple aspects induced by high-velocity trauma leading to combined skull-base and facial frame disruption and with subcranial exposure and other new methods for early one-stage management and reconstruction.

Design and finite element study of Kevlar based combat helmet for protection against high-velocity impacts

2021 ◽  
Author(s):  
Clifton Stephen ◽  
B. Shivamurthy ◽  
Rajiv Selvam ◽  
Sai Rohit Behara ◽  
Abdel-Hamid I. Mourad ◽  
...  
Keyword(s):  
Finite Element ◽  
High Velocity ◽  
Finite Element Study ◽  
High Velocity Impacts ◽  
Element Study

Dynamics and structural transformations of carbon onion-like structures under high-velocity impacts

Carbon ◽  
2021 ◽  
Author(s):  
M.L. Pereira Júnior ◽  
W.F. da Cunha ◽  
R.T. de Sousa Junior ◽  
G.D. Amvame Nze ◽  
D.S. Galvão ◽  
...  
Keyword(s):  
High Velocity ◽  
Structural Transformations ◽  
Carbon Onion ◽  
High Velocity Impacts

scholarly journals The Effect of Layers and Bullet Type on Impact Properties of Glass Fibre Reinforced Polymer (GFRP) Using a Single Stage Gas Gun (SSGG)

2014 ◽  
Vol 564 ◽  
pp. 428-433 ◽  
Author(s):  
S.N.A. Safri ◽  
Mohamed Thariq Hameed Sultan ◽  
N. Razali ◽  
Shahnor Basri ◽  
Noorfaizal Yidris ◽  
...  
Keyword(s):  
Impact Energy ◽  
Glass Fibre ◽  
Impact Test ◽  
Single Stage ◽  
Gas Gun ◽  
Reinforced Polymer ◽  
Glass Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced ◽  
The Impact

The purpose of this work is to study the best number of layer with the higher impact energy using Glass Fibre Reinforced Polymer (GFRP). The number of layers used in this study was 25, 33, 41, and 49. The impact test was performed using Single Stage Gas Gun (SSGG) for each layers given above with different bullets such as blunt, hemispherical and conical bullets. The gas gun pressure was set to 5, 10, 15 and 20 bar. All of the signals captured from the impact test were recorded using a ballistic data acquisition system. The correlation between the impact energy in terms of number of layer and type of bullet from this test are presented and discussed. It can be summarise that as the number of layer increases, impact energy also increases. In addition, from the results, it was observed that by using different types of bullets (blunt, hemispherical, conical), there is only a slight difference in values of energy absorbed by the specimen.

scholarly journals Numerical analysis of high velocity impacts on unidirectional laminates

2014 ◽  
Vol 107 ◽  
pp. 629-634 ◽  
Author(s):  
J. Pernas-Sánchez ◽  
J.A. Artero-Guerrero ◽  
J. Zahr Viñuela ◽  
D. Varas ◽  
J. López-Puente
Keyword(s):  
Numerical Analysis ◽  
High Velocity ◽  
High Velocity Impacts

scholarly journals Effect of reinforcement material on impact properties of epoxy

2017 ◽  
Vol 2 (3) ◽  
pp. 226-231
Author(s):  
Basim M. Fadhil ◽  
Payman Sahbah Ahmed ◽  
Ava Ali Kamal
Keyword(s):  
Carbon Fiber ◽  
Impact Test ◽  
Steel Fiber ◽  
Matrix Composites ◽  
Impact Machine ◽  
Impact Properties ◽  
Different Types ◽  
Experimental Works ◽  
Impact Characteristics ◽  
The Impact

Impact characteristics of Epoxy matrix composites is investigated by impact machine. Four different types of reinforcement are used in the experimental works: type one: 1.9wt% steel fiber, 1.9wt% carbon fiber,1.9 wt% carbon nanotube, 1.9 wt% woven carbon fiber.This work shows that reinforcing epoxy with (1.9 wt% of woven carbon fiber) improves the impact properties where energy, force and deformation values of impact test for this composite were 18.4J, 3580.59 N and 18 mm respectively while for epoxy were 2.927 J, 921.849 N and 18.413 mm respectively.

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