Mechanical Heterogeneity Characterization of Coal Materials Based on the Nano-Indentation Experiment

2021 ◽  
Author(s):  
Qi Zhang ◽  
Xiangchun Li ◽  
Zhongbei Li ◽  
Yaoyu Shi ◽  
Junqing Meng ◽  
...  
Keyword(s):  
Mechanical Heterogeneity ◽  
Nano Indentation ◽  
Indentation Experiment

scholarly journals Characterization of Mechanical Heterogeneity in Dissimilar Metal Welded Joints

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4145
Author(s):  
He Xue ◽  
Zheng Wang ◽  
Shuai Wang ◽  
Jinxuan He ◽  
Hongliang Yang
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Welded Joints ◽  
Structural Integrity ◽  
Material Interfaces ◽  
Mechanical Heterogeneity ◽  
Finite Element Software ◽  
Dissimilar Metal ◽  
Stress Changes

Dissimilar metal welded joints (DMWJs) possess significant localized mechanical heterogeneity. Using finite element software ABAQUS with the User-defined Material (UMAT) subroutine, this study proposed a constitutive equation that may be used to express the heterogeneous mechanical properties of the heat-affected and fusion zones at the interfaces in DMWJs. By eliminating sudden stress changes at the material interfaces, the proposed approach provides a more realistic and accurate characterization of the mechanical heterogeneity in the local regions of DMWJs than existing methods. As such, the proposed approach enables the structural integrity of DMWJs to be analyzed in greater detail.

Nano-mechanical characterization of plasma surface tungstenized layer by depth-sensing nano-indentation measurement

2015 ◽  
Vol 324 ◽  
pp. 160-167 ◽  
Author(s):  
Hongyan Wu ◽  
Yin Li ◽  
Xiao Tang ◽  
G. Hussain ◽  
Haofeng Zhao ◽  
...  
Keyword(s):  
Mechanical Characterization ◽  
Depth Sensing ◽  
Plasma Surface ◽  
Nano Indentation ◽  
Indentation Measurement

Mechanical Characterization of Transient Liquid Phase Sintered (TLPS) Cu-Sn

2018 ◽  
Author(s):  
Erick Gutierrez ◽  
Subramani Manoharan ◽  
Maxim Serebreni ◽  
Patrick McCluskey
Keyword(s):  
Liquid Phase ◽  
Mechanical Load ◽  
Transient Liquid Phase ◽  
Electronic Systems ◽  
Power Electronic ◽  
Nano Indentation ◽  
Lap Shear ◽  
Die Attach ◽  
Power Modules

The increasing thermal demands in power electronic systems require the application of high temperature die attach materials. Transient Liquid Phase Sintered (TLPS) paste-based solder alloys have been demonstrated to effectively manage the thermal and mechanical load requirements of power modules. The microstructural features of these alloys provide interconnects with the necessary strength required to sustain high loads at high temperatures. To properly understand the influence of microstructure on mechanical behavior of these alloys, single lap shear experiments were performed on a TLPS system consisting of Copper and Tin particles (Cu-Sn). Nano-indentation measurements were performed on intermetallic phases of the TLPS, and the results obtained from lap shear testing and nano-indentation measurements are presented.

scholarly journals Nano-mechanical Properties and Pore-Scale Characterization of Different Rank Coals

2019 ◽  
Vol 29 (3) ◽  
pp. 1787-1800 ◽  
Author(s):  
Yihuai Zhang ◽  
Maxim Lebedev ◽  
Gregory Smith ◽  
Yu Jing ◽  
Andreas Busch ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Vitrinite Reflectance ◽  
Chemical Properties ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Indentation Modulus ◽  
Micro Computed Tomography ◽  
Micro Structure ◽  
Nano Indentation

ABSTRACT Characterization of coal micro-structure and the associated rock mechanical properties are of key importance for coal seam exploration, coal bed methane development, enhanced coal bed methane production and CO2 storage in deep coal seams. Considerable knowledge exists about coal chemical properties, but less is known about the nanoscale to the micro-scale structure of coals and how they change with coal strength across coal ranks. Thus, in this study, 3D X-ray micro-computed tomography (with a voxel size of 3.43 µm) and nano-indentation tests were conducted on coal samples of different ranks from peat to anthracite. The micro-structure of peats showed a well-developed pore system with meso- and micro-pores. The meso-pores essentially disappear with increasing rank, whereas the micro-pores persist and then increase past the bituminous rank. The micro-fracture system develops past the peat stage and by sub-bituminous ranks and changes into larger and mature fracture systems at higher ranks. The nano-indentation modulus showed the increasing trend from low- to high-rank coal with a perfect linear relationship with vitrinite reflectance and is highly correlated with carbon content as expected.

scholarly journals Characterization of Nanoscale Mechanical Heterogeneity in a Metallic Glass by Dynamic Force Microscopy

2011 ◽  
Vol 106 (12) ◽  
Author(s):  
Y. H. Liu ◽  
D. Wang ◽  
K. Nakajima ◽  
W. Zhang ◽  
A. Hirata ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Dynamic Force ◽  
Mechanical Heterogeneity ◽  
Force Microscopy

Characterization of Ferroelastic Ceramics by Using Nano-Indentation

2018 ◽  
Vol 2018 (0) ◽  
pp. J0310204
Author(s):  
Wakako Araki ◽  
Xing Wang ◽  
Alan Atkinson
Keyword(s):  
Nano Indentation
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