scholarly journals Carbon stress gage study using the Materials Engineering Division gas gun. [Flying plate impact tests at 3 to 18 kilobars]

1973 ◽  
Author(s):  
A.B. Copeland
Keyword(s):  
Plate Impact ◽  
Materials Engineering ◽  
Impact Tests ◽  
Gas Gun ◽  
Carbon Stress

Research on Inertia Projecting Devices to Eject Water Column for Hydraulic Impact Tests

2013 ◽  
Vol 705 ◽  
pp. 504-508
Author(s):  
Xian Jun Liu ◽  
Xiao Long Wang ◽  
Si Zhong Li ◽  
Wei Zhou Zhong ◽  
Ben Quan Zhou
Keyword(s):  
Water Column ◽  
Impact Force ◽  
High Strength ◽  
Rubber Material ◽  
Impact Tests ◽  
Gas Gun ◽  
Hydraulic Impact ◽  
Regular Shape ◽  
Steel Material ◽  
Strength Material

In order to eject water column with regular shape for hydraulic impact tests, inertia projecting devices are developed. In these devices, a projecting cylinder filled with water is accelerated under huge push of gas gun. When arriving to set speed, the cylinder would impact buffer and suddenlly halt. Then water column in the cylinder will eject under inertial function. In the device for ejecting smaller water column, as impact force is small, projecting cylinder is made of high strength steel material, and can be used again after impacting buffer made of rubber material. In the device for ejecting larger water column, as impact force is huge, projecting cylinder is made of low strength steel material, and will damage after impacting buffer made of high strength material. Using these devices, tests are respectively conducted to eject water column with masses of 30kg and 800kg, and speed and shape of water column all satisfyed requirement of .hydraulic impact tests.

A Hypervelocity Impact Facilities Based on Double-Barreled Two-Stage Light Gas Gun

2013 ◽  
Vol 834-836 ◽  
pp. 825-828
Author(s):  
Jun Yin ◽  
Yu Wang Yang ◽  
Xia Yun Hu ◽  
Cheng Cheng Yong
Keyword(s):  
Optical Method ◽  
Hypervelocity Impact ◽  
Two Stage ◽  
Impact Speed ◽  
Impact Tests ◽  
Gas Gun ◽  
Almost All ◽  
The Impact

For almost all materials the hypervelocity regime has been reached when the impact speed above 2 km/s. A double-barreled two-stage light gas gun (TSLGG) system used for the hypervelocity impact tests is described. The proposed TSLGG can accelerate 50 g projectile masses up to velocities of 2.2 km/s. The craters produced with this equipment reach a diameter of up to 20 cm, a size unique in laboratory cratering research. The experiment results show our TSLGG system work effectively, velocity of the projectile mass is measured highly accurate by means of the proposed optical method.

scholarly journals TRIDENT flyer plate Impact technique: comparison to gas gun plate impact technique

2009 ◽  
Author(s):  
Darcie D Koller ◽  
George T Gray, III ◽  
Sheng-Nian Luo
Keyword(s):  
Flyer Plate ◽  
Plate Impact ◽  
Gas Gun ◽  
Technique Comparison

scholarly journals Comparative Study of Indentation Size Effects in As-Sintered Alumina and Alumina Shock Deformed at 6.5 and 12 GPa

ISRN Ceramics ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Riya Chakraborty ◽  
Anoop K. Mukhopadhyay ◽  
Keshaw D. Joshi ◽  
Amit Rav ◽  
Ashok K. Mandal ◽  
...  
Keyword(s):  
Structural Integrity ◽  
Indentation Size Effect ◽  
High Strain ◽  
Coarse Grain ◽  
Flyer Plate ◽  
Alumina Ceramics ◽  
Indentation Size ◽  
Plate Impact ◽  
Depth Data ◽  
Gas Gun

Nanohardness of alumina ceramics determines its performance in all contact-related applications because the issue of structural integrity gets determined at the nanoscale of contact. In spite of the wealth of the literature, however, it is not yet known in significant details how the high-strain rate flyer-plate impact at different pressure affects the nanohardness of dense, coarse grain alumina ceramics. Thus, the load controlled nanoindentation experiments were performed with a Berkovich indenter on an as-received coarse grain (~10 μm), high density (~3.98 gm·cc−1) alumina, and shock recovered tiny fragments of the same alumina obtained from gas gun experiments conducted at 6.5 GPa and 12 GPa shock pressures with stainless steel flyer plates. The nanohardness of the as-received alumina was much higher than that of the 6.5 GPa and 12 GPa shock-recovered alumina. The indentation size effect (ISE) was the strongest in alumina shocked at 12 GPa and strong in alumina shocked at 6.5 GPa, but it was mild in the as-received alumina sample. These results were rationalized by analysis of the experimental load depth data and evidences obtained from field emission scanning electron microscopy. In addition, a rational picture of the nanoindentation responses of the as-received and shocked alumina ceramics was provided by a qualitative model.

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