Mechanical properties of nanocrystalline copper under thermal load

2012 ◽  
Vol 376 (5) ◽  
pp. 758-762 ◽  
Author(s):  
Yongsoo Choi ◽  
Youngho Park ◽  
Sangil Hyun
Keyword(s):  
Mechanical Properties ◽  
Thermal Load ◽  
Nanocrystalline Copper

scholarly journals Experimental studies on changes in mechanical properties of polymer composites under impact of thermal load determined based on compression testing

2018 ◽  
Vol 247 ◽  
pp. 00027
Author(s):  
Agata Walczak ◽  
Ireneusz Naworol ◽  
Daniel Pieniak ◽  
Kamil Pasierbiewicz ◽  
Grzegorz Dzień
Keyword(s):  
Mechanical Properties ◽  
Polymer Composites ◽  
Thermal Load ◽  
Experimental Studies ◽  
Thermal Exposure ◽  
Protective Properties ◽  
Trade Name ◽  
Young Module ◽  
In Fire ◽  
Compressive Tests

The objective of the study was to carry out an analysis of changes in mechanical properties of polymer composites in conditions of thermal load. Such an analysis may allow an initial verification of possibilities of deploying new composites in production of fire helmet shells. The reference material chosen for testing was the Ultramid composite, which is currently used for the production of fire helmet shells. In addition three different materials were selected that contained reinforcement by glass fibres bearing the trade name of Tarnamid, which are not used in manufacturing of shells. Testing was conducted in conditions of quasi-static load, during which compressive tests were performed. Mechanical loads were applied at different levels of thermal exposure, which was to simulate presence in fire conditions. Results of tests indicated that the Tarnamid composites are characterised by better compressive strength and rigidity determined on the basis of the Young module value than Ultramid PA66 GF25 used in the production of head protective shells. It has also been proven that thermal loads contribute to significant degradation in strength and rigidity of tested materials, which affects adversely protective properties of the helmet.

Study of the structure and mechanical properties of submicrocrystalline and nanocrystalline copper produced by high-rate pressing

2011 ◽  
Vol 111 (6) ◽  
pp. 612-622 ◽  
Author(s):  
I. V. Khomshaya ◽  
E. V. Shorokhov ◽  
V. I. Zel’dovich ◽  
A. E. Kheifets ◽  
N. Yu. Frolova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Rate ◽  
Nanocrystalline Copper

Experimental Investigation on Mechanical Properties of Carbon-Flax-Glass Hybrid Composites

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
M. Dinesh ◽  
R. Asokan ◽  
S. Vignesh ◽  
Chitikena Phani Kumar ◽  
Rajulapati Ravichand
Keyword(s):  
Mechanical Properties ◽  
Thermal Load ◽  
Natural Fiber ◽  
Hybrid Composites ◽  
Natural Fibers ◽  
Thermal Exposure ◽  
Stacking Sequence ◽  
Specific Strength ◽  
Hybrid Laminates ◽  
Fiber Materials

Over the years, application of composite materials has got wider. So there is a necessity for development of new materials to satisfy the environmental requirements. It is viable through the process of hybridization of natural fibers to synthetic fibers. This investigation is carried out to determine the tensile and flexural strength of hybrid composites with various fiber combinations and stacking sequence. Thus it is easy to identify the natural fiber hybrid combination with high mechanical properties under static and varying thermal load conditions. The various fiber materials are meticulously chosen and three conventional and six different hybrid laminates were fabricated with various stacking sequences of selected fibers using hand layup technique. The tensile and flexural properties are determined through mechanical testing and compared with conventional materials. The failure morphologies are captured and investigated with zoom optical cameras. On analyzing the results, it is observed that carbon-flax hybrid composites exhibit nearly equivalent specific strength at a reduced cost compared to the carbon/glass fiber hybrid composites and also the effect of the stacking sequence in mechanical properties is elucidated through this study. Varying thermal load analysis reveals that there is a considerable loss in mechanical properties due to thermal exposure.

Hydric and mechanical properties of carbon fiber reinforced cement composites subjected to thermal load

2004 ◽  
Vol 18 (8) ◽  
pp. 567-578 ◽  
Author(s):  
Jaroslava Drchalová ◽  
Eva Mňahončáková ◽  
Roman Vejmelka ◽  
Jiřı́ Kolı́sko ◽  
Patrik Bayer ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Thermal Load ◽  
Cement Composites ◽  
Fiber Reinforced ◽  
Reinforced Cement ◽  
Carbon Fiber Reinforced

Mechanical properties of nanocrystalline copper and nickel

2004 ◽  
Vol 20 (3) ◽  
pp. 285-294 ◽  
Author(s):  
K. S. Siow ◽  
A. A. O. Tay ◽  
P. Oruganti
Keyword(s):  
Mechanical Properties ◽  
Nanocrystalline Copper

Mechanical Properties of ECAE Nanocrystalline Copper and Nickel

2005 ◽  
Vol 23 ◽  
pp. 183-186 ◽  
Author(s):  
S. Bansal ◽  
A.M. Saxena ◽  
T. Hartwig ◽  
Rao R. Tummala
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Grain Size ◽  
Tensile Strength ◽  
High Purity ◽  
Bulk Sample ◽  
Nanocrystalline Copper ◽  
Average Grain Size ◽  
Angular Extrusion ◽  
Bulk Nanocrystalline

Bulk nanocrystalline copper and nickel (average grain size ~ 50 nm) with high purity and density were synthesized by equichannel angular extrusion (ECAE). Both nanohardness and microhardness measurements revealed a significant increase in hardness of the bulk sample. The tensile strength of these materials has been found to be 5-6 times higher than conventional forms and our experiments show that Cu is extremely stable up to temperatures of 100 oC and Ni to temperatures of 250 oC. The fracture toughness, measured by the value of JIC for nc-copper and nickel have been found to be 21.66 KJ/m2 and 12.13 KJ/m2, respectively which are high for these strength levels.

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