Heterogeneous Material-Based Product Modelling

2010 ◽  
pp. 97-108
Author(s):  
W. D. Li ◽  
S. H. Ding ◽  
K. Popplewell
Keyword(s):  
Heterogeneous Material ◽  
Product Modelling

CROSS-OVER DESIGNS IN THE BIOASSAY OF CORTICOTROPHIN

1960 ◽  
Vol XXXIII (IV) ◽  
pp. 552-558 ◽  
Author(s):  
Jørn Lyng
Keyword(s):  
Heterogeneous Material ◽  
Adrenal Tissue

ABSTRACT The relevant data from 28 subcutaneous triplet cross-over assays of corticotrophin are given. The possible advantage of a twin cross-over design for the »in vitro« standardization of corticotrophin has been investigated, and it is concluded, that when the randomization of the adrenal tissue has been properly performed, there will be no advantage in this design. An attempt has been made to do an »in vitro« cross-over assay of corticotrophin without mixing the glands. The efficiency of the design is shown, but it is concluded that it is not effective enough to eliminate the effect of the highly heterogeneous material.

Heterogeneous material integration with photonic crystal platforms for nanophotonic devices on foreign substrates

2008 ◽  
Author(s):  
Weidong Zhou ◽  
Zhenqiang Ma ◽  
Hongjun Yang ◽  
Li Chen ◽  
Zexuan Qiang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Heterogeneous Material ◽  
Nanophotonic Devices

Multiple particle tracking

2018 ◽  
Author(s):  
Eric M. Furst ◽  
Todd M. Squires
Keyword(s):  
Brownian Motion ◽  
Best Practices ◽  
Particle Tracking ◽  
Heterogeneous Material ◽  
Quantitative Measurements ◽  
Particle Tracking Microrheology ◽  
Shell Models ◽  
Multiple Particle Tracking ◽  
Microscopy Data ◽  
Multiple Particle

The fundamentals and best practices of multiple particle tracking microrheology are discussed, including methods for producing video microscopy data, analyzing data to obtain mean-squared displacements and displacement correlations, and, critically, the accuracy and errors (static and dynamic) associated with particle tracking. Applications presented include two-point microrheology, methods for characterizing heterogeneous material rheology, and shell models of local (non-continuum) heterogeneity. Particle tracking has a long history. The earliest descriptions of Brownian motion relied on precise observations, and later quantitative measurements, using light microscopy.

scholarly journals Degradation Monitoring in Reinforced Concrete with 3D Localization of Rebar Corrosion and Related Concrete Cracking

2021 ◽  
Vol 11 (15) ◽  
pp. 6772
Author(s):  
Charlotte Van Steen ◽  
Els Verstrynge
Keyword(s):  
Reinforced Concrete ◽  
Degradation Mechanism ◽  
Heterogeneous Material ◽  
Corrosion Damage ◽  
Corrosion Process ◽  
Internal Damage ◽  
Rc Structures ◽  
Degradation Monitoring ◽  
Rebar Corrosion ◽  
Width Measurements

Corrosion of the reinforcement is a major degradation mechanism affecting durability and safety of reinforced concrete (RC) structures. As the corrosion process starts internally, it can take years before visual damage can be noticed on the surface, resulting in an overall degraded condition and leading to large financial costs for maintenance and repair. The acoustic emission (AE) technique enables the continuous monitoring of the progress of internal cracking in a non-invasive way. However, as RC is a heterogeneous material, reliable damage detection and localization remains challenging. This paper presents extensive experimental research aiming at localizing internal damage in RC during the corrosion process. Results of corrosion damage monitoring with AE are presented and validated on three sample scales: small mortar samples (scale 1), RC prisms (scale 2), and RC beams (scale 3). For each scale, the corrosion process was accelerated by imposing a direct current. It is found that the AE technique can detect damage earlier than visual inspection. However, dedicated filtering is necessary to reliably localize AE events. Therefore, AE signals were filtered by a newly developed post-processing protocol which significantly improves the localization results. On the smallest scale, results were confirmed with 3D micro-CT imaging, whereas on scales 2 and 3, results were compared with surface crack width measurements and resulting rebar corrosion levels.

Experimental and Numerical Characterization of Lower Huron Shale as a Heterogeneous Material

2021 ◽  
Author(s):  
Ming Fan ◽  
Yanhui Han ◽  
Xinyu Tan ◽  
Liang Fan ◽  
Ellen S. Gilliland ◽  
...  
Keyword(s):  
Heterogeneous Material ◽  
Numerical Characterization

Study on the mechanism of inhomogeneous microdamage in short-pulse laser processing of carbon fiber reinforced plastic

2021 ◽  
pp. 073168442098359
Author(s):  
Luyao Xu ◽  
Jiuru Lu ◽  
Kangmei Li ◽  
Jun Hu
Keyword(s):  
Carbon Fiber ◽  
Pulse Energy ◽  
Short Pulse ◽  
Heterogeneous Material ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Processing Efficiency ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Carbon Fiber Reinforced

In this article, a micro-heterogeneous material simulation model with carbon fiber and resin phase about laser ablation on carbon fiber reinforced plastic (CFRP) is established by Ansys. The ablation process of CFRP by nanosecond ultraviolet laser is simulated, and the mechanism of pulse energy and spot spacing on the heat-affected zone (HAZ) is studied, then the process parameters are optimized with the goal of HAZ size and processing efficiency, and finally the validity of the model is verified by experiments. It is found that the residual gradient and the width of the radial HAZ increase with the increase of the spot spacing, and the width of the axial HAZ decreases slightly with the increase of the spot spacing, which indicates the existence of the optimal spot spacing. Second, the ablation depth increases with the increase of the pulse energy, and the carbon fiber retains a relatively complete degree of exposure when the pulse energy is low, which has a certain guiding significance for the cleaning and bonding of CFRP.

Stress concentration and size effect in fracture of notched heterogeneous material

2011 ◽  
Vol 83 (1) ◽  
Author(s):  
Alexander S. Balankin ◽  
Orlando Susarrey ◽  
Carlos A. Mora Santos ◽  
Julián Patiño ◽  
Amalia Yoguez ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Size Effect ◽  
Heterogeneous Material

Photoacoustic Microscopic Analysis of a Heterogeneous Material - Coal

1983 ◽  
Author(s):  
A. Biswas ◽  
K.L. Telschow ◽  
T. Ahmed ◽  
K.W. Johnson
Keyword(s):  
Microscopic Analysis ◽  
Heterogeneous Material

scholarly journals Abstract Nonconforming Error Estimates and Application to Boundary Penalty Methods for Diffusion Equations and Time-Harmonic Maxwell’s Equations

2018 ◽  
Vol 18 (3) ◽  
pp. 451-475 ◽  
Author(s):  
Alexandre Ern ◽  
Jean-Luc Guermond
Keyword(s):  
Error Analysis ◽  
Error Estimates ◽  
Material Properties ◽  
Maxwell’S Equations ◽  
Vector Fields ◽  
Maxwell's Equations ◽  
Heterogeneous Material ◽  
Test Functions ◽  
Time Harmonic ◽  
New Formulation

AbstractWe devise a novel framework for the error analysis of finite element approximations to low-regularity solutions in nonconforming settings where the discrete trial and test spaces are not subspaces of their exact counterparts. The key is to use face-to-cell extension operators so as to give a weak meaning to the normal or tangential trace on each mesh face individually for vector fields with minimal regularity and then to prove the consistency of this new formulation by means of some recently-derived mollification operators that commute with the usual derivative operators. We illustrate the technique on Nitsche’s boundary penalty method applied to a scalar diffusion equation and to the time-harmonic Maxwell’s equations. In both cases, the error estimates are robust in the case of heterogeneous material properties. We also revisit the error analysis framework proposed by Gudi where a trimming operator is introduced to map discrete test functions into conforming test functions. This technique also gives error estimates for minimal regularity solutions, but the constants depend on the material properties through contrast factors.

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