D. Nowell
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View article: Application of machine learning for ‘what if?’ stress analysis
Application of machine learning for ‘what if?’ stress analysis Open
Analysis of stresses in components of even modestly complex geometries often require the use of finite element analysis (FEA). For testing a large number of design options quickly, FEA can be time consuming and provides more accuracy than …
View article: Review of "Non-local fatigue criterion based on standard deviation for notches and defects in Ti-6Al-4V"
Review of "Non-local fatigue criterion based on standard deviation for notches and defects in Ti-6Al-4V" Open
This is the open review of an article published in JTCAM, DOI:10.46298/jtcam.12473
View article: Fracture behaviour of reaction-bonded silicon carbide-boron carbide using digital image correlation
Fracture behaviour of reaction-bonded silicon carbide-boron carbide using digital image correlation Open
The current research uses the Digital Image Correlation (DIC) approach to study the fracture behaviour of Reaction-Bonded Silicon Carbide-Boron Carbide (SiC–B4C) ceramic (RBSBC). A Photron camera with 137,500 fps was used to capture the cr…
View article: Testing and Modeling of Friction and Slip in Mechanical Interfaces: State of the Art and Perspectives for the Next Decade.
Testing and Modeling of Friction and Slip in Mechanical Interfaces: State of the Art and Perspectives for the Next Decade. Open
Experiments and physics-based modeling efforts both show that the features within a jointed interface can have an outsized influence on the nonlinear dynamics of a large-scale structure. The interfacial features, including asperities and m…
View article: Informed machine learning methods for application in engineering: A review
Informed machine learning methods for application in engineering: A review Open
Machine Learning (ML) has proved to be successful at identifying and representing underlying relationships in large data sets which would be difficult to process manually. However, the large amounts of data required for unsupervised learni…
View article: Influence of mesoscale friction interface geometry on the nonlinear dynamic response of large assembled structures
Influence of mesoscale friction interface geometry on the nonlinear dynamic response of large assembled structures Open
Friction interfaces are unavoidable components of large engineering assemblies since they enable complex designs, ensure alignment, and enable the transfer of mechanical loads between the components. Unfortunately, they are also a major so…
View article: Linear relationship of normal and tangential contact stiffness with load
Linear relationship of normal and tangential contact stiffness with load Open
Measurements with digital image correlation of normal and tangential contact stiffness for ground Ti-6Al-4V interfaces suggest a linear relationship between normal contact stiffness and normal load and a linear relationship between tangent…
View article: Low-cycle fatigue behaviour of an aero-engine disk alloy under non-proportional loading
Low-cycle fatigue behaviour of an aero-engine disk alloy under non-proportional loading Open
The quest for higher efficiency and fuel economy has pushed aeroengines to challenging levels. In order to become more efficient, engines must run at higher bypass ratios and temperatures, resulting in extreme operating conditions for thei…
View article: Approaches to fatigue life prediction under multiaxial loading
Approaches to fatigue life prediction under multiaxial loading Open
The paper will consider a set of biaxial experiments, conducted using a cruciform specimen design, manufactured from Waspaloy, a nickel superalloy used in aircraft engine disks. These are analysed using a number of standard, as well as nov…
View article: Prediction of fatigue crack initiation under biaxial loading
Prediction of fatigue crack initiation under biaxial loading Open
This investigation revisits biaxial fatigue experiments carried out with the nickel-based superalloy termed Waspaloy. Recently, yield criteria extended to multiaxial fatigue and stress based approaches were analysed and their performance t…
View article: Measurement and analysis of fatigue crack deformation at the micro-scale
Measurement and analysis of fatigue crack deformation at the micro-scale Open
This paper introduces the use of digital image correlation for the measurement of surface displacements in the neighbourhood of a crack tip, both at the macro- and micro- scale. Various methods of interpreting the measured data and produci…
View article: Measurement and analysis of fatigue crack deformation on the macro- and micro-scale
Measurement and analysis of fatigue crack deformation on the macro- and micro-scale Open
The paper describes an experiment which performs in-situ loading of a small compact tension specimen in a scanning electron microscope. Images are collected throughout a number of successive loadincg cycles. These are then analysed using d…