Mach one impact test apparatus utilizing an 18.4‐mm‐bore gas gun with a novel decelerating device

1979 ◽  
Vol 50 (7) ◽  
pp. 824-828 ◽  
Author(s):  
A. P. Coppa ◽  
G. F. Selden ◽  
R. L. Mehan
Keyword(s):  
Impact Test ◽  
Test Apparatus ◽  
Gas Gun

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 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 High Velocity Impact Test on Glass Fibre Reinforced Polymer (GFRP) Using a Single Stage Gas Gun (SSGG) - An Experimental Based Approach

2014 ◽  
Vol 564 ◽  
pp. 376-381 ◽  
Author(s):  
N. Razali ◽  
Mohamed Thariq Hameed Sultan ◽  
S.N.A. Safri ◽  
Shahnor Basri ◽  
Noorfaizal Yidris ◽  
...  
Keyword(s):  
Composite Material ◽  
Impact Test ◽  
Impact Force ◽  
Specimen Thickness ◽  
Gas Gun ◽  
Reinforced Polymer ◽  
Glass Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced ◽  
The Impact

The aim of this work is to study the effect of thickness and type of bullet in impact test on structures made from a composite material. The composite material used in this study was Glass Fibre Reinforced Polymer (GFRP). This material was fabricated to produce laminated plate specimens with dimension of 100 mm × 100 mm and 6, 8, 10, and 12 mm thickness. The impact test was performed using a Single Stage Gas Gun (SSGG) with blunt, hemispherical, and conical types of bullets. The gas gun pressure was set to 5, 10, 15 and 20 bar. In the tests, gas gun pressure, bullet type and specimen thickness were varied to ascertain the influence of these parameters on the materials response. The relation between impact force with gas pressure, type of bullets and specimens thickness are presented and discussed. The best thickness for GFRP was identified according to the impact results. From the impact tests conducted, it was found that at the same amount of pressure, the higher the thickness, the bigger the impact force because as the specimen thickness increases, the amount of impact force absorbed by the specimen is higher.

Effects of Moisture Content and Impact Energy on the Cracking Characteristics of Walnuts

2014 ◽  
Vol 10 (1) ◽  
pp. 149-156 ◽  
Author(s):  
Feizollah Shahbazi
Keyword(s):  
Moisture Content ◽  
Impact Energy ◽  
Impact Test ◽  
Interaction Effects ◽  
Optimum Moisture Content ◽  
Test Apparatus ◽  
Cracking Characteristics ◽  
Impact Energies ◽  
Different Levels ◽  
Kernel Yield

Abstract A study was conducted to determine the effects of moisture content and energy of impact on the cracking characteristics of walnuts. A sample of fresh harvested walnuts was divided into four portions and conditioned under sunshine for different time durations to obtain different levels of moisture content [9.2–29.7%, wet basis (w.b.)]. An impact test apparatus was used to apply different impact energies in the range of 0.13–1.11 J to samples with different moisture content. Data obtained on the quantity of fully cracked and unbroken kernel, fully cracked but broken kernel and uncracked nuts were used in the computation of the nuts cracking characteristics. Results showed that moisture content, impact energy and interaction effects of these two variables have significant effect on the walnuts cracking characteristics. Full cracking of nuts increased with impact energy and decreasing moisture content. The optimum moisture content for cracking walnuts that gave the best result combination of high whole kernel yield and low kernel breakage was found to be about 16%. The optimum impact energy for cracking was found to be about 1.01 J (1.01 ± 0.1 J). The results of this study show that development of a centrifugal impact cracker, which uses impact to crack walnuts, is possible. In the designing of the walnut cracker, the radius and speed of the cracker should be such that create impact energy and velocity of about 1.01 J and 11 m/s, respectively, and walnuts should be conditioned to the moisture content of about 16% for optimum efficiency.

scholarly journals Response of an Impact Test Apparatus for Fall Protective Headgear Testing Using a Hybrid-III Head/Neck Assembly

2016 ◽  
Vol 40 (1) ◽  
pp. 413-427 ◽  
Author(s):  
V. Caccese ◽  
J. Ferguson ◽  
J. Lloyd ◽  
M. Edgecomb ◽  
M. Seidi ◽  
...  
Keyword(s):  
Impact Test ◽  
Test Apparatus ◽  
Hybrid Iii ◽  
Head Neck

An elastodynamic interpretation of impact test apparatus for soils

Géotechnique ◽  
1995 ◽  
Vol 45 (4) ◽  
pp. 691-700 ◽  
Author(s):  
T. G. Davies ◽  
U. F. Karim
Keyword(s):  
Impact Test ◽  
Test Apparatus

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
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