The Shear Response of a Thin Aluminum Layer

2010 ◽  
Vol 78 (1) ◽  
Author(s):  
V. L. Tagarielli ◽  
N. A. Fleck
Keyword(s):  
Layer Thickness ◽  
Thickness Effect ◽  
Isotropic Hardening ◽  
Gradient Plasticity ◽  
Microvoid Coalescence ◽  
Thin Aluminum ◽  
Final Failure ◽  
Loading Tests ◽  
Reversed Loading ◽  
Versus Strain

Aluminum layers, 10–50 μm thick, have been diffusion bonded to alumina blocks and subjected to simple shear in order to determine the sensitivity of shear stress versus strain response to layer thickness. No significant thickness effect on strength is observed and reversed loading tests indicate isotropic hardening. Final failure in shear is by microvoid coalescence within the sandwich layer with a void spacing comparable to the layer thickness. The significance of the results for strain gradient plasticity theory is discussed.

Predictions of microtorsional experiments by micropolar plasticity

2005 ◽  
Vol 461 (2053) ◽  
pp. 189-205 ◽  
Author(s):  
Paschalis Grammenoudis ◽  
Charalampos Tsakmakis
Keyword(s):  
Size Effects ◽  
Bauschinger Effect ◽  
Kinematic Hardening ◽  
Circular Cylinders ◽  
Isotropic Hardening ◽  
Gradient Plasticity ◽  
Material Response ◽  
Micropolar Plasticity ◽  
Classical Plasticity ◽  
Hardening Rules

Kinematic hardening rules are employed in classical plasticity to capture the so–called Bauschinger effect. They are important when describing the material response during reloading. In the framework of thermodynamically consistent gradient plasticity theories, kinematic hardening effects were first incorporated into a micropolar plasticity model by Grammenoudis and Tsakmakis. The aim of the present paper is to investigate this model by predicting size effects in torsional loading of circular cylinders. It is shown that kinematic hardening rules compared with isotropic hardening rules, as adopted in the paper, provide more possibilities for modelling size effects in the material response, even if only monotonous loading conditions are considered.

Active layer thickness effect on the recombination process of PCDTBT:PC71BM organic solar cells

2013 ◽  
Vol 14 (1) ◽  
pp. 74-79 ◽  
Author(s):  
Gon Namkoong ◽  
Jaemin Kong ◽  
Matthew Samson ◽  
In-Wook Hwang ◽  
Kwanghee Lee
Keyword(s):  
Solar Cells ◽  
Layer Thickness ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Recombination Process ◽  
Thickness Effect ◽  
Active Layer Thickness

Active Layer Thickness Effect on the Behavior of Electrodes Based on Lithium Iron Phosphate

2019 ◽  
Vol 55 (3) ◽  
pp. 200-205
Author(s):  
E. K. Tusseeva ◽  
T. L. Kulova ◽  
A. M. Skundin ◽  
A. K. Galeeva ◽  
A. P. Kurbatov
Keyword(s):  
Layer Thickness ◽  
Active Layer ◽  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
Thickness Effect ◽  
Active Layer Thickness

Seismic Behavior of Top-weld Bottom-bolt Joints between CFST Columns and H-beams

2021 ◽  
Author(s):  
Jianxin Zhang ◽  
Xian Rong ◽  
Xiaowei Zhang ◽  
Yanyan Li ◽  
Yansheng Du ◽  
...  
Keyword(s):  
Failure Mode ◽  
Design Criterion ◽  
Steel Beams ◽  
Tubular Columns ◽  
Weak Beam ◽  
Beam Design ◽  
Loading Tests ◽  
Reversed Loading ◽  
Cfst Columns ◽  
Beam Height

Abstract In recent decades, connections between concrete-filled steel tubular columns (CFST) and H-steel beams have been well designed and implemented. However, owing to poor construction quality, brittle failure often occurs at weld seams. In this study, an innovative joint was developed to connect CFST columns and H-steel beams using a top-weld bottom-bolt (TWBB) connection to minimize the effect of welding quality on the seismic resistance of joints. Six specimens were designed for cycle-reversed loading tests to discuss the seismic performance of this joint. Four configurations, including different connection methods, beam heights, column forms, and stiffener thicknesses, were considered in the test. The impacts of different configuration forms on the failure mode, strength, stiffness, ductility, and energy dissipation of the specimens were evaluated. The test results demonstrated that the columns with or without concrete had a significant effect on the deformation capacity. However, a smaller effect was observed on other indicators. The replacement of the through-diaphragm and an increase in the beam height adversely influenced the ductility of the joint. Moreover, changing the stiffener thickness and using a full-bolted connection affected the failure mode. The joint type analyzed in this study satisfies the strong column–weak beam design criterion and the related seismic provisions.

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