196,075 research outputs found
Data for figure MCR concrete-FRP bond paper Achintha et al 2017
No full textData for figure in:
Achintha, M., Alami, F., Harry, S., & Bloodworth, A. (2017). Towards innovative FRP fabric reinforcement in concrete beams: concrete–CFRP bond. Magazine of Concrete Research, https://doi.org/10.1680/jmacr.17.00016</span
Dataset for: A Validated Modelling Technique for Incorporating Residual Stresses in Glass Structural Design. Structures Volume 29, February 2021, Pages 446-457
No full textData set for a journal manuscript: Mithila Achintha (2021) A validated modelling technique for incorporating residual stresses in glass structural design, Structures, Volume 29, Pages 446-457.
https://doi.org/10.1016/j.istruc.2020.11.052</span
Fracture mechanics of plate debonding: experimental validation
No full textPremature plate debonding hampers the efficient use of externally bonded FRP plates for flexural strengthening of concrete beams. Existing research mostly concentrates on finite element (FE) modelling of the concrete–FRP interface but such analyses are of dubious validity because they require far more details than will ever be available for the interface. A fracture-mechanics-based plate debonding model has been developed by the authors; since detailed stress analysis of concrete is unattainable the model is based on the global energy balance of the system. Flaws will inevitability be present in the vicinity of the interface; the model investigates the energy balance when such a flaw propagates. The energy released when the crack extends (GR) is compared with the interface fracture energy required to create the new surfaces GF: If GR > GF the crack will extend causing debonding.Determination of both GR and GF associated with crack extension is not trivial because of the unknowable microstructure of concrete. The early work of the present study developed methods to find both parameters to accuracies sufficient for practical purposes. A modified version of Branson’s model, which takes account of the effects caused by the axial force in the FRP, has been developed for the moment–curvature and subsequent GR analyses, while GF has been determined according to the actual fracture mechanism that takes place in the interface.This paper presents comparisons with a variety of plate debonding test data (including steel plate bonded beams) reported in the literature and shows that the present model can correctly determine both the failure load and the debonding mode. Only simply-supported beams, without additional plate end anchors, under short-term monotonic loads are considered here, but the model could be extendedto analyse more complex practical problems
Residual stress in geometric features subjected to laser shock peening
No full textThis paper reports selected findings from a collaborative research study into the fundamental understanding of laser shock peening (LSP), when applied to key airframe and aero-engine alloys. The analyses developed include explicit simulations of the peening process together with a simpler eigenstrain approach, which may be used to provide an approximation to the residual stress field in a number of geometries. These are chosen to represent parts of structural components under conditions relevant to service applications. The paper shows that the eigenstrain approach can provide good approximations to the stress field in most circumstances and may provide a computationally efficient tool for exploring different peening strategies. Both explicit and eigenstrain results demonstrate that the interaction between the LSP process and geometric features is important for understanding the subsequent performance of components. Particularly relevant for engineering applications is that not all instances of LSP application may provide an improvement in structural integrity
Dataset: GFRP Reinforced Glass–Bolted Joints
No full textAssigned DOI: https://doi.org/10.5258/SOTON/D1044
Dataset supports: Achintha, Mithila & Zirbo, T. (2021). GFRP reinforced high performance glass–bolted joints: concept and 2 experimental characterisation. Construction and Building Materials, 274, [122058].</span
Fracture mechanics of plate debonding
No full textThe study has shown that the phenomena of plate debonding can be studied by means of a fracture-mechanics approach, which obviates the need for a finite element analysis which would have dubious validity in the presence of infinite stress concentrations.It has been necessary to produce a modified form of Branson’s method to allow the calculation of the beam stiffness when the section is partially cracked and when subjected to an axial load imposed by the FRP plate.Hutchinson’s interface breakdown model has proved to be a very useful tool for the study of the debonding of FRP plates from concrete structures. More work remains to be done to study the importance of the various parameters that influence the result. Comparisons with experimental data in the literature are being undertaken
Data for figures in "Low cycle fatigue life prediction in shot-peened components of different geometries – Part II Life prediction"
No full textThis dataset reports data for the figures published in:
C. You, M. Achintha, K.A. Soady, P.A.S. Reed "Low cycle fatigue life prediction in shot-peened components of different geometries – Part II Life prediction"
The excel files included in this dataset were named in terms of the number of figures. Each excel file refers to a figure in the paper.</span
Data for figures in "Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material"
No full textThis dataset reports data for the figures published in:
C. You, B.Y. He, M. Achintha, P.A.S Reed "Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material" in the International Journal of Fatigue</span
Eigenstrain modelling of residual stress generated by arrays of Laser Shock Peeing shots and determination of the complete stress field using limited strain measurements
Full text linkThis paper presents a hybrid explicit finite element (FE) /eigenstrain model for predicting the residual stress generated by arrays of adjacent/overlapping laser shock peening (LSP) shots where the use of a completely explicit FE analysis may be impractical. It shows that for a given material, the underlying eigenstrain distribution (in contrast to the resulting stress field) representing a laser shock peen is primarily dependent on the parameters of the laser pulse and the number of overlays rather than the precise component geometry. Consequently the residual stress introduced by complex laser peening treatments can be built up by using static FE models and superposition of individual eigenstrain distributions without recourse to further computationally demanding explicit FE analyses. It is found that beneath a small patch of LSP array the magnitude of the compressive residual stress is higher than for a wider array of LSP shots and that with increasing numbers of layers the compressive stress increases as does the depth of the compressive zone. The model predictions for the eigenstrain distributions are compared well with experimental measurements of plastic strain (full-width-at-half-maximum) obtained by neutron diffraction. The eigenstrain method is also extended to construct the full residual stress field using measured residual elastic strains at a finite number of measurement locations in a component.<br/
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