Advanced Materials and Processes Research Institute
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Characterizing the crack initiation load in circumferentially\ud through-wall cracked elbows under bending load
No full textDuctile fracture assessments of circumferentially through-wall cracked elbows, based on the elastic–plastic J-integral concept, are discussed with particular interest in its ability and accuracy to predict experimental results corresponding to the initiation of stable crack growth. 3D non-linear finite element analysis is backed up with experimental results to determine the crack initiation load. Non-linear finite element analyses were performed considering both material and geometrical non-linearity using the advanced fracture analysis code WARP3D. Numerical analyses have been carried out to understand the role of crack tip constraint in standard specimens and the elbow\ud
component. An attempt has been made to obtain a unique multiaxiality quotient (q) for evaluation of the level of constraint. The work provides benchmark data to assist in the engineering treatment of cracked piping elbows
Rational approximants to 5, 8 and 7-fold two-dimensional tilings
No full textThe strip projection method is used to generate rational approximants to Penrose, octagonal and 7-fold tilings. Two types of approximants to the Penrose tiling are considered, wherein the basis vectors of the approximants are either orthogonal or are 72° apart. Various types of approximants including those with partially retained quasiperiodicity are generated and the pseudosymmetries arising therein analyzed. A simplified approach based on uniform distortions of perpendicular space is put forth for the analyses
Vacancy ordered phases in Al-Cu-Ni as quasi periodic superlattice approximants
No full textVacancy ordered phases in the Al-Cu-Ni system have an arrangement of vacant and filled sites in the truncated Fibonacci sequence along the [111] direction. The length scales involved are commensurate and in the limit a quasiperiodic superlattice is obtained. The implication of having commensurate length scales and quasiperiodicity in conjunction is studied using the concept of average lattices and projection formalism
Correlating Microstructural Features and Mechanical Properties with Abrasion Resistance of a High Strength Low Alloy Steel
No full textA study towards the examination of the abrasive wear behaviour and other characteristics, viz. microstructure, tensile properties and hardness of a high strength low alloy steel has been carried out in order to establish a correlation amongst the parameters and to optimize the microstructural features and mechanical properties for superior wear performance. The steel was subjected to various heat treatment cycles for generating different combinations of microstructural features and mechanical and wear properties. The study suggests that, apart from hardness, ductility also plays a vital role in deciding the wear characteristics of steels. It has also been observed that an improvement in the abrasion resistance of the order of ∼50% can be achieved by subjecting the steel to suitable heat treatment cycles. Mechanical properties of the steel also change simultaneously. These features are ultimately controlled by the microstructural characteristics of the specimens. The results obtained have been supplemented through the characteristics of the worn surfaces, subsurface regions, debris and fractured surfaces. These analyses also helped to understand the operative mechanisms of material removal and failure
Dry Sliding Wear Response of a Zn-Based Alloy Containing 37.5% Al as Affected by Sliding Conditions.
No full textA plant comparison of the vorsyl separator and dense medium cyclone in the treatment of Indian Coals.
No full textIn India, a major portion of metallurgical coal of desirable ash is produced from the dense medium cyclone (DMC) process. Based on detailed laboratory studies, vorsyl separator (VS), a centrifugal dense medium separator, was established to be a possible alternative to the dense medium cyclone. To establish further at commercial scale, trials were undertaken with 400 and 600-mm vorsyl separators made of mild steel, at the captive washeries of the Tata Iron and Steel. The studies clearly showed that the VS gave about 4% higher combustible recovery compared to a DMC at the same ash rejection level. Generalised Ep value of 0.033–0.045 for VS was also found lower compared to 0.043–0.068 for DMC. This clearly established the better sharpness of separation in VS compared to DMC. Vorsyl separator made of suitable wear-resistant material is recommended for regular plant use
Role of PET in improving wear property of PP in dry sliding condition
No full textThe mechanical properties and dry sliding wear behaviour of glass fabric reinforced epoxy (G-E) composite with varying weight percentage of silicon dioxide (SiO2) filler have been studied in the present work. The influence of sliding distance, velocity, and applied normal load on dry sliding wear behaviour has been considered using Taguchi's L9 orthogonal array. Addition of SiO2 increased the density, hardness, flexural, and impact strengths of G-E composite. Results of dry sliding wear tests showed increasing wear volume with increase in sliding distance, load, and sliding velocity for G-E and SiO2 filled G-E composites. Taguchi's results indicate that the sliding distance played a significant role followed by applied load, sliding velocity, and SiO2 loading. Scanning electron micrographs of the worn surfaces of composite samples at different test parameters show smooth surface, microploughing, and fine grooves under low load and velocity. However, severe damage of matrix with debonding and fiber breakage was seen at high load and velocity especially in unfilled G-E composite.\u
A plant comparision of the vorsyl separator and dense medium cyclone in the treatment of Indian coals.
No full textIn India, a major portion of metallurgical coal of desirable ash is produced from the dense medium cyclone (DMC) process. Based on detailed laboratory studies, vorsyl separator (VS), a centrifugal dense medium separator, was established to be a possible alternative to the dense medium cyclone. To establish further at commercial scale, trials were undertaken with 400 and 600-mm vorsyl separators made of mild steel, at the captive washeries of the Tata Iron and Steel. The studies clearly showed that the VS gave about 4% higher combustible recovery compared to a DMC at the same ash rejection level. Generalised Ep value of 0.033–0.045 for VS was also found lower compared to 0.043–0.068 for DMC. This clearly established the better sharpness of separation in VS compared to DMC. Vorsyl separator made of suitable wear-resistant material is recommended for regular plant use
Steady state rheology of PP/PET blends
No full textThe objective of this study is to report the results of steady state viscoelastic properties in molten state investigated experimentally for PP/PET blends. They were prepared by the elastic extrusion method. The present paper discusses the influence of different types of PP, blending composition and effect of compatibilizer on steady state viscoelastic properties of PP/PET in molten state
Mahua -oil-based Resins for the High- Temperature Curing of Fly Ash coating
No full textWe attempted to prepare medium-oil-length\ud
glycerol alkyds based on Mahua oil. Fatty acids were iso-\ud
lated from the oil and used in the preparation of alkyds by\ud
the fusion method. The resins were characterized by IR\ud
spectroscopic analysis. The physicochemical and lm prop-\ud
erties of these resins were also studied. IR analysis of the\ud
resins revealed the formation of phthalate esters showing\ud
characteristic peaks at 1720 cm1. The resin was modied\ud
with melamine formaldehyde, which cured at high temper-\ud
atures. Alternatively, the resin was made to air dry with\ud
ester gum, and the curing behavior was studied. The suit-\ud
ability of these resins for high-temperature curing y ash\ud
coating applications was established. Coatings were formu- lated with these resins and with 40% y ash as an extender.\ud
The coatings were characterized by standard techniques,\ud
particularly for their anticorrosive and antiabrasive proper-\ud
ties. Resistance to corrosion was evaluated in humidity and\ud
in salt-spray conditions. We conducted a high-stress (two-\ud
body) abrasion test to test the abrasive wear resistance of the\ud
coatings. The Mahua-oil-resin-based y ash coatings were\ud
suitable for application in moderately corrosive and abrasive\ud
environments. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87:\ud
110–120, 200