Journal
COMPOSITE STRUCTURES
Volume 255, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2020.112886
Keywords
Bimetallic porous composite; Mechanical property; Electrical performance; Weight ratio; Double-helix entangled structure
Categories
Funding
- National Natural Science Foundation of China [51705080]
- Natural Science Foundation of Fujian Province [2018J01764]
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The weight ratio of copper/steel in the bimetallic porous composite significantly affects the mechanical and electrical performance of the material, showing a non-proportional relationship over a range of displacement. During compression, the contact between internal bimetallic wires leads to nonlinearity in resistance-force curves.
Cu-steel bimetallic porous composite structures can be used as lightweight, damping, and electro-conductive elements in critical environments where traditional single materials become ineffective. In the present work, a novel Cu-steel bimetallic porous composite with a double-helix entangled structure was developed. The mechanical properties (static stiffness, loss factor, and tangent modulus) of the as-synthesized composite were characterized by compressive tests, and its electrical sensitivity to compressive force was examined by mechanical-electrical coupling tests. The effect of the copper/steel weight ratio on mechanical and electrical performances was analyzed in detail. It is found that the Cu-steel bimetallic porous composite with a relatively high weight ratio has a larger average loss factor and lower stiffness than that with a low weight ratio. The structural characteristics and complex microstructural changes of the deformed specimen allow the tangent modulus and stiffness to exhibit a non-proportional relationship with the weight ratio over a range of displacement. The resistance-force curves exhibit an obvious nonlinearity and degradation due to the contact between internal bimetallic wires. The resistance-stiffness history reveals that the mitigation of electrical conductivity continued with the enlargement of stiffness and weight ratio.
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