Microstructure and Properties of Al Alloys: A Personal View | Chapter 2 | Research Aspects in Chemical and Materials Sciences Vol. 1

 The axiom "Microstructure dictates characteristics" is commonly believed, yet it is tested and found inadequate in this study. While bifilms from the casting process are often inconspicuous in the microstructure, they are frequently just as essential, if not far more so, since they appear as a dense population of fissures throughout the metal. The bifilm population controls the morphology of several cast and wrought structural properties. For cast alloys, bifilm control of pore morphology and Si morphology, as well as dendritic arm spacing, is investigated (DAS). Grain refining appears to have largely bifilm controlled advantages in terms of tensile characteristics. The composition of bifilms appears to have a significant impact on ductility and fatigue. Pitting, intergranular corrosion, hydrogen blistering, and cracking are examples of intrusive corrosion processes. Bifilm control is proposed as a novel method for improving and controlling metallurgical qualities.

Author(s) Details:

John Campbell,
Emeritus Professor of Casting Technology School of Metallurgy and Materials, Engineering Faculty, University of Birmingham, UK.

Please see the link here: https://stm.bookpi.org/RACMS-V1/article/view/7077

Performance Evaluation of Reinforced Geopolymer Concrete as Earthquake Resistant Composite | Chapter 6 | New Approaches in Engineering Research Vol. 15

With the increasing challenges of ground vibrations due to seismic activity and the ever-increasing threat of blast loadings on structures, it has become more than a simple necessity to incorporate robust design strengths into structures without compromising serviceability life. When structural elements' ability to absorb and disperse energy through post elastic deformations subjected to multiple cycles of these loading is naturally incorporated at cheap cost, their performance is well acknowledged. The single controlling property for a structural element's healthy performance is its flexural element's ductility. Although several elements contribute to the ductility of Reinforced Geopolymer Concrete (RGPC), low calcium-based fly ash and GGBS have chemical proportions that allow RGPC to generate significant ductility when mixed in an intelligent way that meets structural and economic requirements. The impact of low calcium fly ash, GGBS, River sand, M-sand, Steel Grade, manufactured fibres, and natural fibres on RGPC ductility is investigated in this study using load testing 51 with reinforced flexural elements. Similar tests on the flexural ductilities of Ordinary Portland Cement based flexural elements conducted by other researchers show that Reinforced Geopolymer Concrete Structural Elements are extremely comparable and appreciated.

Author(S) Details

N. B. Mahantesh
Department of Civil Engineering, Alliance College of Engineering and Design, Bengaluru, India.

View Book:- https://stm.bookpi.org/NAER-V15/article/view/4025

Cracking for Low-reinforced RC Members under Uniaxial Tension | Chapter 5 | Emerging Trends in Engineering Research and Technology Vol. 3

Given the random nature of crack formation, research into reinforced concrete members in the context of cracking behavior proves difficult. Therefore, widely accepted methodologies for predicting crack characteristics, e.g. crack width and spacing and number of cracks, have not been developed yet. Furthermore, cracking for members strained until high degrees of elongation, as takes place during earthquakes, has not been investigated before. This experimental work aims to look into the impact, primarily of tensile deformation’s mechanical factor, in terms of cracking behaviour. Four test specimens were strained under uniaxial tensile loading. The degrees of elongation used were equal to 10‰, 20‰, 30‰ and 50‰. Useful conclusions concerning cracking behaviour are derived.

Author (s) Details
Theodoros Chrysanidis
Democritus University of Thrace, Xanthi, Greece.

Vassilis Panoskaltsis
Democritus University of Thrace, Xanthi, Greece.

View Book :- http://bp.bookpi.org/index.php/bpi/catalog/book/179