scholarly journals Mechanical responses of 3D cross-chiral auxetic materials under uniaxial compression

2020 ◽  
Vol 186 ◽  
pp. 108226 ◽  
Author(s):  
Qingsong Wang ◽  
Zhenyu Yang ◽  
Zixing Lu ◽  
Xiang Li
Keyword(s):  
Uniaxial Compression ◽  
Mechanical Responses ◽  
Auxetic Materials

scholarly journals Stochastic Constitutive Relationship of Self-Compacting Concrete under Uniaxial Compression

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Xiao Li ◽  
Zhi Shan ◽  
Zhiwu Yu ◽  
Jing Gao ◽  
Jianfeng Mao
Keyword(s):  
Uniaxial Compression ◽  
Practical Method ◽  
Constitutive Relationship ◽  
Experimental Investigations ◽  
Chain Model ◽  
Self Compacting Concrete ◽  
Mechanical Responses ◽  
Cyclic Compression ◽  
Proposed Model ◽  
Relationship Of

Experimental investigations on self-compacting concrete (SCC) under uniaxial monotonic and cyclic compression taking into account the stochastic constitutive relationship were reported and conducted. By introducing a practical method on plasticity characterization into the fiber bundle-plastic chain model, a new constitutive model based on the statistic damage approach for describing the stochastic mechanical responses of SCC under uniaxial compression was proposed. The comparison between the experimental results and the predictions demonstrated that the proposed model was able to characterize the salient features for SCC under both uniaxial monotonic and cyclic compression. Furthermore, the stochastic evolution (SE) of SCC under uniaxial compression and a comparison between the SCC and normally vibrated concrete (NVC) in certain aspects were analyzed and discussed; it was concluded that the stochastic constitutive relationship of SCC under compression can be understood by a media process of transition from microscale to macroscale.

Can Micro-Chiral Cellular Structures Be Auxetic?

2015 ◽  
Author(s):  
Kaveh Samadikhah ◽  
Giulia Lanzara
Keyword(s):  
Scientific Community ◽  
Cellular Structures ◽  
Mechanical Responses ◽  
New Class ◽  
Optimization Study ◽  
Auxetic Materials ◽  
Auxetic Structures ◽  
Negative Poisson's Ratio ◽  
Geometrical Dimensions ◽  
The Way

Auxetic materials with negative Poisson’s ratio have recently attracted the interest of the scientific community. This is because these materials have the potential to deliver specific functions thanks to a discretization of their constitutive matter that is intended as an aggregation of macro-scaled cellular structures characterized by specific geometries. Many auxetic structures with different geometries and auxetic response have been proposed. Downscaling the cellular structures (e.g. microscale) has the potential to improve the overall auxetic properties of the material, yet there is not enough research on the behavior of these structures at the microscale. This paper studies the auxetic behavior of a modified hexachiral structure formed by microscale elements. First an optimization study was performed to define the most appropriate geometrical dimensions. Then the auxeticity of the proposed cell was assessed carefully introducing a new Coefficient of Auxeticity which allowed to capture complex mechanical responses (e.g. including cellular rotations) as those faced with the proposed design. The proposed miniaturized design shows an outstanding stable auxetic response up to 20% strain of the micro-cell. It is believed that this study has the potential to pave the way to a new class of auxetic materials.

Direct quantification of mechanical responses of TiSiN/Ag multilayer coatings through uniaxial compression of micropillars

Vacuum ◽  
2018 ◽  
Vol 156 ◽  
pp. 310-316 ◽  
Author(s):  
Chaoqun Dang ◽  
Temitope Olugbade ◽  
Sufeng Fan ◽  
Hongti Zhang ◽  
Libo Gao ◽  
...  
Keyword(s):  
Uniaxial Compression ◽  
Multilayer Coatings ◽  
Mechanical Responses ◽  
Direct Quantification

Mechanical responses and dynamic failure of nanostructure Cu–Al alloys under uniaxial compression

2017 ◽  
Vol 114 ◽  
pp. 147-160 ◽  
Author(s):  
Jianguo Li ◽  
Yulong Li ◽  
Chongxiang Huang ◽  
Tao Suo
Keyword(s):  
Uniaxial Compression ◽  
Al Alloys ◽  
Dynamic Failure ◽  
Mechanical Responses

Atomistic simulation of the uniaxial compression of black phosphorene nanotubes

2018 ◽  
Author(s):  
Van-Trang Nguyen ◽  
Minh-Quy Le
Keyword(s):  
Finite Element Method ◽  
Molecular Dynamics ◽  
Finite Element ◽  
Uniaxial Compression ◽  
Critical Stress ◽  
Atomistic Simulation ◽  
Critical Strain ◽  
Bond Breaking ◽  
Black Phosphorene ◽  
Weber Potential

We study through molecular dynamics finite element method with Stillinger-Weber potential the uniaxial compression of (0, 24) armchair and (31, 0) zigzag black phosphorene nanotubes with approximately equal diameters. Young's modulus, critical stress and critical strain are estimated with various tube lengths. It is found that under uniaxial compression the (0, 24) armchair black phosphorene nanotube buckles, whereas the failure of the (31, 0) zigzag one is caused by local bond breaking near the boundary.

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