Advances in Residual Stress Technology in Honor of Drew Nelson
The Effect of Bulk Residual Stress on Milling-Induced Residual Stress and Distortion
Background: Distortion arises during machining of metallic parts from two main mechanisms: 1) release of bulk residual stress (BRS) in the pre-form, and 2) permanent deformation induced by cut tools. Interaction between these mechanisms is unexplored. Objective: Assess this interaction using aluminum samples that have a flat surface with variations...
The transition to aeration in turbulent two-phase mixing in stirred vessels
We consider the mixing dynamics of an air–liquid system driven by the rotation of a pitched blade turbine (PBT) inside an open, cylindrical tank. To examine the flow and interfacial dynamics, we use a highly parallelised implementation of a hybrid front-tracking/level-set method that employs a domain-decomposition parallelisation strategy. Our nume...
Improved creep behaviour for a high strength Al-Li alloy in creep age forming: Experimental studies and constitutive mod...
The creep deformation of 3rd generation 2xxx Al-Li alloys in creep age forming (CAF) is unsatisfactorily low due to its high strength and required low ageing temperature, especially for the commonly used T8 temper. Promoting creep deformation in such process will significantly reduce springback in CAF, making easier the springback compensation in t...
The influence of residual stress on fatigue crack growth rates of additively manufactured Type 304L stainless steel
To examine the influence of residual stress on mechanical performance, specifically fatigue crack growth resistance, additively manufactured (AM) Type 304L stainless steel produced by directed energy deposition (DED) was evaluated and compared to conventional wrought Type 304/304L stainless steel. Increasing and decreasing alternating stress intens...
Numerical modelling of 2D woven composites by the projective element method
A novel method is presented in this paper to allow for realistic creation of 2D woven composite fabric models considering deformation modes incurred during manufacturing. The proposed computational framework is named as the Projective Element Method (PEM). The PEM provides a new strategy for the woven composite modelling, in which a representative ...
A general framework for decomposing the phase field fracture driving force, particularised to a Drucker–Prager failure s...
Due to its computational robustness and versatility, the phase field fracture model has become the preferred tool for predicting a wide range of cracking phenomena. However, in its conventional form, its intrinsic tension–compression symmetry in damage evolution prevents its application to the modelling of compressive failures in brittle and quasi-...
A Cartesian immersed boundary method based on 1D flow reconstructions for high-fidelity simulations of incompressible tu...
The aim of the present numerical study is to show that the recently developed Alternating Direction Reconstruction Immersed Boundary Method (ADR-IBM) [1] can be used for Fluid-Structure Interaction (FSI) problems and can be combined with an Actuator Line Model (ALM) and a Computer-Aided Design (CAD) interface for high-fidelity simulations of fluid ...
A stress-based poro-damage phase field model for hydrofracturing of creeping glaciers and ice shelves
There is a need for computational models capable of predicting meltwater-assisted crevasse growth in glacial ice. Mass loss from glaciers and ice sheets is the largest contributor to sea-level rise and iceberg calving due to hydrofracture is one of the most prominent yet less understood glacial mass loss processes. To overcome the limitations of em...
Large Eddy simulation of a reacting kerosene spray in hot vitiated cross-flow
The evaporation and combustion characteristics of a kerosene spray injected perpendicularly into a cross-flow of high-temperature vitiated air is investigated. This fundamental flow configuration has wider implications for the future development of ultra-low emission aeronautical combustors, particularly with respect to technologies involving MILD ...
