Further experimental study of the unloading phenomenon in constant velocity impact

This paper describes an experimental method of determining sliding friction forces in a pneumatic actuator. Several empirical and semi-empirical friction models are evaluated using measured friction force data. A repeatability study is also performed to qualitatively assess friction randomness and a change in friction regimes.

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An experimental study of high-velocity impact on elastic–plastic crushable polyurethane foams

Aerospace Science and Technology ◽

10.1016/j.ast.2015.11.013 ◽

2016 ◽

Vol 50 ◽

pp. 245-255 ◽

Cited By ~ 5

Author(s):

Ali Taherkhani ◽

Mojtaba Sadighi ◽

Ali Sadough Vanini ◽

Mohsen Zarei Mahmoudabadi

Keyword(s):

Experimental Study ◽

High Velocity ◽

Polyurethane Foams ◽

High Velocity Impact ◽

Velocity Impact ◽

Elastic Plastic

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Experimental Study on High-velocity Impact Damage Behavior of Carbon Fiber Reinforced Composite Laminates

American Society for Composites 2017 ◽

10.12783/asc2017/15281 ◽

2017 ◽

Author(s):

WENBO HUANG ◽

ZHIXIAN LU ◽

WENZHI WANG ◽

CHAO ZHANG

Keyword(s):

Experimental Study ◽

Carbon Fiber ◽

High Velocity ◽

Composite Laminates ◽

Impact Damage ◽

High Velocity Impact ◽

Fiber Reinforced Composite ◽

Damage Behavior ◽

Velocity Impact ◽

Reinforced Composite

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An Experimental Study of High-Velocity Impact on Aluminum Foam Composite Shield Structure

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.690-693.20 ◽

2013 ◽

Vol 690-693 ◽

pp. 20-24

Author(s):

Qing Zhen Li ◽

Zhong Hua Du ◽

Kang Kang Wang

Keyword(s):

Experimental Study ◽

High Speed ◽

Aluminum Foam ◽

Space Debris ◽

Hypervelocity Impact ◽

Protective Effects ◽

High Velocity Impact ◽

Protective Structure ◽

Velocity Impact ◽

Foam Composite

To study spacecraft shield structure against hypervelocity impact of space debris and its protective performances, 25mm ballistic gun launching 12.7mm cylindrical debris is selected against Aluminum foam composite structure at high speed. Based on the experimental results and analyze the effects of Aluminum foam protective structure with different combinations, the result is that protective effects with Aluminum foam in front of glass fiber is better.

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The decomposition of potassium hydrogen oxalate hemihydrate

Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character ◽

10.1098/rspa.1929.0192 ◽

1929 ◽

Vol 125 (799) ◽

pp. 635-646 ◽

Cited By ~ 14

Keyword(s):

Experimental Study ◽

Transition Temperature ◽

Calcium Carbonate ◽

Direct Observation ◽

Constant Velocity ◽

Spherical Surface ◽

Crystalline Particle ◽

Previous Communication ◽

Potassium Hydrogen ◽

Solid Phases

In a previous communication, Topley and Hume described the results obtained in an experimental study of the decomposition of calcium carbonate hexahydrate and showed that they could be most reasonably explained by assuming that reaction occurred only at the interface separating the two solid phases, CaCO 3 . 6H 2 O and CaCO 3 . In addition it was assumed that this interface advanced through the crystalline particle with constant velocity in all directions; that is to say, the interface advanced as an expanding spherical surface, described about the nucleus as centre. Since the latter assumption is inherently improbable, it was decided to investigate a reaction the interfacial nature of which would be beyond question and which would be susceptible to direct observation. After considerable search a suitable reaction was found in the decomposition of potassium hydrogen oxalate hemihydrate, i. e. , 2KHC 2 O 4 .H 2 O → 2KHC 2 O 4 + H 2 O. The transition temperature of the hemihydrate, according to Hartley and others, is in the neighbourhood of 6⋅4° C.

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