Statistical analysis of chloride concentration distribution in concrete by a meso-scale model considering irregular shape aggregates

2022 ◽  
Vol 319 ◽  
pp. 126143
Author(s):  
Zhi-Lu Jiang ◽  
Zhi-Wei Qian ◽  
Xiang-Lin Gu ◽  
Ji-Hua Zhu ◽  
Wu-Jian Long ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Concentration Distribution ◽  
Chloride Concentration ◽  
Irregular Shape ◽  
Scale Model ◽  
Meso Scale

A novel synergistic multi-scale modeling framework to predict micro- and meso-scale damage behaviors of 2D triaxially braided composite

2021 ◽  
pp. 105678952110339
Author(s):  
Hongyong Jiang ◽  
Yiru Ren ◽  
Qiduo Jin
Keyword(s):  
Compressive Load ◽  
Scale Model ◽  
Modeling Framework ◽  
Braided Composite ◽  
Multi Scale ◽  
Scale Modeling ◽  
Bridge Model ◽  
Multi Scale Modeling ◽  
Transverse Damage ◽  
Meso Scale

A novel synergistic multi-scale modeling framework with a coupling of micro- and meso-scale is proposed to predict damage behaviors of 2D-triaxially braided composite (2DTBC). Based on the Bridge model, the internal stress and micro damage of constituent materials are respectively coupled with the stress and damage of tow. The initial effective elastic properties of tow (IEEP) used as the predefined data are estimated by micro-mechanics models. Due to in-situ effects, stress concentration factor (SCF) is considered in the micro matrix, exhibiting progressive damage accumulation. Comparisons of IEEP and strengths between the Bridge and Chamis’ theory are conducted to validate the values of IEEP and SCF. Based on the representative volume element (RVE), the macro properties and damage modes of 2DTBC are predicted to be consistent with available experiments and meso-scale simulation. Both axial and transverse damage mechanisms of 2DTBC under tensile or compressive load are revealed. Micro fiber and matrix damage accumulations have significant effects on the meso-scale axial and transverse damage of tows due to multi-scale coupling effects. Different from existing meso-/multi-scale models, the proposed multi-scale model can capture a crucial phenomenon that the transverse damage of tow is vulnerable to micro fiber fracture. The proposed multi-scale framework provides a robust tool for future systematic studies on constituent materials level to larger-scale aeronautical materials.

scholarly journals A Comparative Evaluation of a Mesoscale Model and Atmospheric Global Circulation Model for Air Quality Simulation: A Multiscale, Multisite Evaluation

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
P. Goswami ◽  
J. Baruah
Keyword(s):  
High Resolution ◽  
Mesoscale Model ◽  
Large City ◽  
Circulation Model ◽  
Urban Pollution ◽  
Atmospheric Pollutants ◽  
Scale Model ◽  
Global Circulation Model ◽  
Global Circulation ◽  
Meso Scale

Concentrations of atmospheric pollutants are strongly influenced by meteorological parameters like rainfall, relative humidity and wind advection. Thus accurate specifications of the meteorological fields, and their effects on pollutants, are critical requirements for successful modelling of air pollution. In terms of their applications, pollutant concentration models can be used in different ways; in one, short term high resolution forecasts are generated to predict and manage urban pollution. Another application of dynamical pollution models is to generate outlook for a given airbasin, such as over a large city. An important question is application-specific model configuration for the meteorological simulations. While a meso-scale model provides a high-resolution configuration, a global model allows better simulation of large-sale fields through its global environment. Our objective is to comparatively evaluate a meso-scale atmospheric model (MM5) and atmospheric global circulation model (AGCM) in simulating different species of pollutants over different airbasins. In this study we consider four locations: ITO (Central Delhi), Sirifort (South Delhi), Bandra (Mumbai) and Karve Road (Pune). The results show that both the model configurations provide comparable skills in simulation of monthly and annual loads, although the skill of the meso-scale model is somewhat higher, especially at shorter time scales.

scholarly journals Forensic Engineering Analysis Of Falling Merchandise In A Retail Warehouse

2006 ◽  
Vol 23 (1) ◽  
Author(s):  
Wilbur T. Yaxley ◽  
Armstrong Jeffrey D.
Keyword(s):  
Safety Analysis ◽  
Irregular Shape ◽  
Scale Model ◽  
Personal Injury ◽  
Restraint System ◽  
Engineering Analysis ◽  
Engineering Approach ◽  
Policies And Procedures ◽  
Forensic Engineering ◽  
The Chairs

This Paper Discusses A Forensic Engineering Approach To The Analysis Of Falling Merchandise Incidents In Retail Warehouses. A Discussion Of The Engineering And Safety Analysis Of Two Personal Injury Incidents Caused By Falling Merchandise Is Included. The First Incident Involves A Fork-Lift Pallet That Held A Stack Of Lounge Chairs, Which Fell From An Overhead Shelf, Striking A Customer. The Stack Of Lounge Chairs Was An Irregular Shape That Was Longer And Narrower Than The Pallet. The Chairs Were Held Together With Stretch Wrap And Attached To The Pallet With x-Bracing Using Cords Made Of Twisted Stretch Wrap. The Placement Of The Pallet In The Overhead Shelf, The Attachment Of The Chairs To The Pallet, And Various Safety Policies And Procedures Are Analyzed. Various Analyses To Determine The Properties Of Stretch Wrap Were Performed. A Scale Model Was Constructed To Assist With The Analysis. The Second Incident Involves A Rack Of Vertically Stacked Lumber That Fell Forward Striking A Customer After He Had Removed One Or Two Boards From The Rack And Placed Them On A Cart. The Boards, The Stacking System, And The Restraint System Are Analyzed. A Video Re-Enactment Was Prepared To Illustrate How The Boards Fell.

Spraying Experiments with a Model Stern Trawler

1998 ◽  
Vol 42 (04) ◽  
pp. 260-265 ◽  
Author(s):  
K. K. Chung ◽  
E. P. Lozowski ◽  
W. P. Zakrzewski ◽  
R. Gagnon ◽  
T. Thompson
Keyword(s):  
Statistical Analysis ◽  
Froude Number ◽  
Significant Wave Height ◽  
Flux Distribution ◽  
Full Scale ◽  
Scale Model ◽  
Spray Droplet ◽  
Towing Tank ◽  
Ship Speed ◽  
Longitudinal Distance

With a view to formulating vessel spraying and icing models, 22 spraying experiments were performed in the IMD/NRC towing tank using a 1:13 scale model of the stern trawler MT Zandberg. Neglecting the effect of wind drag on the spray droplet trajectories, an empirical spray flux equation for the scale Zandberg was derived, based on a statistical analysis of the spraying data. Using Froude number scaling, this model-scale equation was transformed into a full-scale spray flux equation. This spraying study shows that the total spray flux generated during ship/wave collisions depends on ship speed (Vs) and significant wave height (H1/3) according to V3⅓, H7⅓ while the spray flux distribution over the foredeck varies exponentially with longitudinal distance. Using this full-scale spray flux equation, a spray trajectory model, taking wind drag effects into account, was subsequently developed.

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