scholarly journals Study on the Dynamic Mechanical Properties of Viscoelastic Materials Based on Asymmetrical Sandwich Beams

2018 ◽  
Vol 8 (8) ◽  
pp. 1359 ◽  
Author(s):  
Qingqing Wu ◽  
Minqing Wang
Keyword(s):  
Mechanical Properties ◽  
Dynamic Properties ◽  
Estimation Method ◽  
Dynamic Mechanical Properties ◽  
Test Method ◽  
Core Material ◽  
Beam Specimen ◽  
Viscoelastic Materials ◽  
Dynamic Mechanical ◽  
The Core

A modified estimation method for the dynamic mechanical properties of viscoelastic materials via asymmetrical sandwich specimens is presented. In contrast to the traditional vibrating cantilever beam test method (VCBTM), the proposed method allows asymmetrical base beams in sandwich specimens. Based on the complex stiffness method, complex parameters are introduced for general sandwich configurations. Calculation formulas for loss factor and shear modulus of the core material are presented. The effectiveness of this approach is validated numerically and experimentally by analysis of one symmetrical sandwich beam specimen and two specimens with asymmetrical thicknesses and materials. It is shown that dynamic mechanical parameters of the core material can be obtained regardless of sandwiches’ symmetry. The proposed method breaks the symmetrical criteria for sandwich specimens and may provide a wider application to measure viscoelastic materials’ dynamic properties.

Dynamic Mechanical Properties of Steel Fiber-Reinforced Concrete Subjected to Shock Loading

2011 ◽  
Vol 52-54 ◽  
pp. 703-708
Author(s):  
Fang Jiang ◽  
Yue Sheng Tan ◽  
Dong Zhao
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Shock Loading ◽  
Dynamic Properties ◽  
Constitutive Relations ◽  
Dynamic Mechanical Properties ◽  
Fiber Reinforced Concrete ◽  
Steel Fiber Reinforced Concrete ◽  
Specific Internal Energy ◽  
Dynamic Mechanical

One-stage light gas gun is used to study the dynamic mechanical properties of reinforced concrete (SFRC) subjected to shock loading. The material of projectile is the same as of the target. The stress-time curves are recorded by three manganin pressure transducers embedded in the targets beforehand. The data of experiment are analyzed by self-designed program using the path line principle of Lagrangian analysis method. With the stress records, complete histories of particle velocity, density (and thus strain) and specific internal energy can be obtained at any point within the gaged region of the material. Moreover, the numerical constitutive relations of RC are obtained and the strain rate ranges from 104 to 105 per second. The result of experiment indicates that the stress-strain curves of SFRC present stagnant-return properties. And some other dynamic properties can be gained, such as rate dependent, waveform dissipation etc.

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