Advanced Materials and Processes Research Institute
Advanced Materials and Processes Research Institute, BhopalNot a member yet
809 research outputs found
Sort by
Dry Sliding Wear Response of Zinc-Based Alloy over a Range of Test Speeds and Loads: a Comparative Study with Cast Iron.
No full text
Development of mathmatical model for prediction of abrasive wear behaviour in agriculture grade medium carbon steel
No full textCompressive deformation behavior of coarse SiC particle reinforced composite: effect of age hardening and SiC content.
No full textCompressive deformation of 2014 Al-alloy–SiCp composite has been compared with that of 2014 Al-alloy in as-cast and peak aged condition. In as-cast condition, the strength, elastic modulus and strain-hardening exponent of the alloy were improved significantly at the expense of its ductility due to reinforcement of SiC particles. After peak aging, the strength of individual material increased, but the elastic modulus and work hardening rate remained almost unchanged. It was interestingly noted that in peak aged condition composites exhibited less strength as compared to that of the alloy. However, the strength, the elastic modulus and the strain-hardening exponent of the composite increased with increase in SiC content irrespective of the processing condition. These have been explained in the perspective of matrix flow and crack propagation depending on interface characteristics, matrix strength and particle shearing. In cast condition, the matrix strength is low enough and the particles are quite stronger than the as-cast matrix. As a result, the particles are capable to resist the flow of the matrix, and the crack propagates primarily through the interdendritic region of the matrix. But in heat-treated condition, the matrix strength increased significantly. It results in intensifying the stress intensity above a critical value at the sharp tip of the flaws within the particles causing particle failure prior to the matrix failure
A comparison of micro, meso and macroscale FEM analysis of ductile fracture in a CT specimen (mode I)
No full textSeveral methods are available to understand the process of crack initiation and propagation in ductile materials. In an attempt to achieve an overall understanding, some of these techniques were studied using a large deformation based finite element method (FEM). In the current investigation, typical crack tip blunting prior to ductile fracture behavior of a standard (CT) specimen under mode I loading condition was simulated using FEM. An attempt was made to understand the ductile fracture by numerically determining the ductile fracture toughness at three length scales: macroscopic scale (load–displacement method), mesoscopic scale (path-integral method) and microscopic scale (stretch zone width method). In addition, the characteristic distance (lc), commonly defined as the distance between the crack tip and the void responsible for eventual coalescence with the crack tip, was also studied. Although approximate, lc assumes a special significance since it links the fracture toughness to the microscopic mechanism considered responsible for ductile fracture
Compressive Deformation Behaviour of Coarse SiC Particle Reinforced Composite: Effect of Age-Hardening and SiC Content
No full textCompressive deformation of 2014 Al-alloy–SiCp composite has been compared with that of 2014 Al-alloy in as-cast and peak aged condition. In as-cast condition, the strength, elastic modulus and strain-hardening exponent of the alloy were improved significantly at the expense of its ductility due to reinforcement of SiC particles. After peak aging, the strength of individual material increased, but the elastic modulus and work hardening rate remained almost unchanged. It was interestingly noted that in peak aged condition composites exhibited less strength as compared to that of the alloy. However, the strength, the elastic modulus and the strain-hardening exponent of the composite increased with increase in SiC content irrespective of the processing condition. These have been explained in the perspective of matrix flow and crack propagation depending on interface characteristics, matrix strength and particle shearing. In cast condition, the matrix strength is low enough and the particles are quite stronger than the as-cast matrix. As a result, the particles are capable to resist the flow of the matrix, and the crack propagates primarily through the interdendritic region of the matrix. But in heat-treated condition, the matrix strength increased significantly. It results in intensifying the stress intensity above a critical value at the sharp tip of the flaws within the particles causing particle failure prior to the matrix failure
An analysis of spring back in sheet metal bending using finite method (FEM).
No full textA large deformation algorithm based on Total-Elastic-Incremental-Plastic Strain (TEIP) was used for modeling a typical sheet metal bending process. The bending process involves large strain, rotation as well as springback due to elastic recovery of the material. A finite element method (FEM) software based on TEIP strain that is capable of handling large rotation and elastic recovery was employed. In this investigation, the prediction of springback was essentially carried out as numerical experiment and the results are presented in terms of springback ratio. In particular, this study examines the effect of load on springback varying the thickness as well as the radius of the die. The numerical results agree with the experimental ones with a reasonable accuracy
Role of Poly Vinyl Alcohol on the Conductivity Behaviour of Polyethylene Glycol Composite Gel Electrolytes
No full textAn attempt has been made in the present work to combine gel and composite polymer electrolyte routes together to form a composite polymeric gel electrolyte that is expected to possess high ionic conductivity with good mechanical integrity. Polyethylene glycol (PEG) based composite gel electrolytes using polyvinyl alcohol (PVA) as guest polymer have been synthesized with 1 molar solution of ammonium thiocyanate (NH4SCN) in dimethyl sulphoxide (DMSO) and electrically characterized. The ionic conductivity measurements indicate that PEG:PVA:NH4SCN-based composite gel electrolytes are superior (σ max = 5.7 × 10−2 S cm−1) to pristine electrolytes (PEG:NH4SCN system) and conductivity variation with filler concentration remains within an order of magnitude. The observed conductivity maxima have been correlated to PEG:PVA:NH4SCN-and PVA:NH4SCN-type complexes. Temperature dependence of conductivity profiles exhibits Arrhenius behaviour in low temperature regime followed by VTF character at higher temperature