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INTRODUCTION
 Cryogenic treatment is methodology of ultra-low temperature processing of materials to enhance their properties to the desired levels. The precise cryogenic treatment cycle consists of three phases of descent, soak & ascend.
 Cryogenic tempering is the extreme cold to re-define the molecular structure in metals. Material subjected to deep cryogenic temperature develop a more uniform, redefined microstructure with greater density.
• Austenite, the softer molecules in the microstructure is trans ....etc

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PREPARED BY
ABHISHEK KUMAR SHARMA


Fracture Mechanism In Design And Failure Analysis
Introduction
 Separation of solid into two or more pieces under applied load or stress
 Applied load or stress may be tensile or compressive in nature
 Fracture due to
1. Crack initiation
2. Crack propagation
Principles of Fracture Mechanics
 Quantitative study of failure is called fracture mechanics
 Fracture mechanics is the relationship between
 Material properties
 Stress level
 ....etc

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One of the central objectives of multiscale materials modeling is to develop and apply simulation techniques to uncover atomic-level mechanisms without the significant limitations on system size and simulation time inherent to purely atomistic methods. In this context, I have made two contributions. I developed an interatomic potential finite element method (IPFEM) to study homogeneous dislocation nucleation by nano-indentation. The implementation of IPFEM facilitates simulations at length scales that are large compared to atomic dimensions, wh ....etc

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Atomistic Characterization of Dislocation Nucleation and Fracture



One of the central objectives of multiscale materials modeling is to develop and apply simulation techniques to uncover atomic-level mechanisms without the significant limitations on system size and simulation time inherent to purely atomistic methods. In this context, I have made two contributions. I developed an interatomic potential finite element method (IPFEM) to study homogeneous dislocation nucleation by nano-indentation. The implementation of IPFEM facilitates sim ....etc

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Stable tearing crack growth (slow ductile growth of a macroscopic crack in a load-bearing structure) is an important fracture failure process in ductile materials (e.g. metals) and usually precedes the final catastrophic failure of a structure. In recent years, there has been a growing demand for a simulation-based structural design and evaluation methodology that takes into account the stable tearing crack growth process. Within such a methodology, two tools must be available: (1) an efficient computer simulation code that can handle the kinem ....etc

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Ductile Mixed-mode Fracture Criterion Development and Crack Growth Simulations




Stable tearing crack growth (slow ductile growth of a macroscopic crack in a load-bearing structure) is an important fracture failure process in ductile materials (e.g. metals) and usually precedes the final catastrophic failure of a structure. In recent years, there has been a growing demand for a simulation-based structural design and evaluation methodology that takes into account the stable tearing crack growth process. Within such a methodology, two too ....etc

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