A new analytical-empirical model for the instantaneous diffuse radiation and experimental investigation of its validity

AbstractThe most important property of cements and concretes after strength is the workability, which is controlled by the rheological characteristics of the mix. Theoretical modeling having proved complicated and in some cases mathematically untractable, cement specialists have concentrated on empirical based models for the last two decades. The major theoretical contributions to date on the properties of colloidal and concentrated suspensions are summarized and a general framework for theoretical modeling of cement viscosity is established. The empirical modeling and the experimental investigation of the rheological properties of fresh cements are reviewed and discussed. A semi-empirical model is proposed and its validity tested in the interpretation of some published experimental results.

Download Full-text

Material Removal Rate of Zirconia in Electro Discharge Micromachining

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1115.20 ◽

2015 ◽

Vol 1115 ◽

pp. 20-23

Author(s):

Banu Asfana ◽

Mohammad Yeakub Ali ◽

Abdul Rahman Mohamed ◽

Wayne N.P. Hung

Keyword(s):

Experimental Investigation ◽

Material Removal Rate ◽

Empirical Model ◽

Rotational Speed ◽

Material Removal ◽

Removal Rate ◽

Micro Edm ◽

Tungsten Electrode ◽

Design Expert ◽

Optimum Parameters

This paper investigates the material removal rate (MRR) in electro discharge micromachining (micro-EDM) of zirconia. Experimental investigation is carried out with 800 μm diameter tungsten electrode with two varying parameters rotational speed and gap voltage. The MRR data are analyzed and an empirical model is developed using Design Expert software. The optimum parameters for maximum MRR are found to be 375 rpm rotational speed and 80 V gap voltage.

Download Full-text

Experimental investigation and empirical model to determine the damping and shear stiffness properties of soft rock under multistage cyclic loading

Soil Dynamics and Earthquake Engineering ◽

10.1016/j.soildyn.2021.106818 ◽

2021 ◽

Vol 147 ◽

pp. 106818

Author(s):

M.M. He ◽

Z.Q. Zhang ◽

N. Li

Keyword(s):

Experimental Investigation ◽

Cyclic Loading ◽

Empirical Model ◽

Soft Rock ◽

Shear Stiffness ◽

Stiffness Properties

Download Full-text

Effects of mixture ingredients on extrudability of concrete in Contour Crafting

Rapid Prototyping Journal ◽

10.1108/rpj-01-2017-0006 ◽

2018 ◽

Vol 24 (4) ◽

pp. 722-730 ◽

Cited By ~ 3

Author(s):

Babak Zareiyan ◽

Behrokh Khoshnevis

Keyword(s):

Experimental Investigation ◽

Empirical Model ◽

Design Methodology ◽

Construction Process ◽

Shape Stability ◽

Content Type ◽

Contour Crafting ◽

Concrete Mixtures ◽

Significant Factors

Purpose This paper aims to investigate the extrudability (flow-ability and shape-stability) of concrete mixtures by using contour crafting (CC) as an automated construction process. Design/methodology/approach Several experiments have been performed for flow-ability and shape-stability of concrete mixtures. Experimental results were compared to understand significant factors and their interactions. After developing the empirical model for flow-ability, the model was validated. Findings The experimental investigation of varied combination of concrete components developed a mixture within constrains of the CC nozzle and improved the quality of the extruded part. Originality/value Several experimental samples were fabricated using CC, and the derived empirical model was validated after more than 700 h of work.

Download Full-text