Publications
183 results found
Kim N-H, Oh C-S, Kim Y-J, et al., 2013, Creep failure simulations of 316H at 550°C: Part II - Effects of specimen geometry and loading mode, ENGINEERING FRACTURE MECHANICS, Vol: 105, Pages: 169-181, ISSN: 0013-7944
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- Citations: 63
Li D-F, Davies CM, Zhang S-Y, et al., 2013, The effect of prior deformation on subsequent microplasticity and damage evolution in an austenitic stainless steel at elevated temperature, ACTA MATERIALIA, Vol: 61, Pages: 3575-3584, ISSN: 1359-6454
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- Citations: 37
Davies CM, Mehmanparast A, 2013, Creep Crack Growth Modelling in 316H Stainless Steel, Advanced Materials Modelling for Structures, Editors: Altenbach, Kruch, Publisher: Springer, Pages: 109-120, ISBN: 978-3-642-35166-2
Davies CM, Dean DW, Mehmanparast A, 2013, TDFAD Analysis of Creep Crack Initiation in Pre-Strained and As-Received Type 316H Stainless Steel, ASME Pressure Vessels and Piping Division Conference, AMER SOC MECHANICAL ENGINEERS
Mehmanparast A, Davies CM, Dean DW, et al., 2013, Specimen Orientation and Constraint Effects on the Creep Crack Growth Behaviour of 316H Stainless Steel, ASME Pressure Vessels and Piping Division Conference, AMER SOC MECHANICAL ENGINEERS
Yazdani Nezhad H, O'Dowd NP, Davies CM, et al., 2013, Influence of Prior Deformation on Creep Crack Growth Behaviour of 316H Austenitic Steels, ASME Pressure Vessels and Piping Division Conference, AMER SOC MECHANICAL ENGINEERS
Nezhad HY, O'Dowd NP, Davies CM, et al., 2012, Influence of prior deformation on creep crack growth behaviour of 316H austenitic steels, American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, Vol: 6, Pages: 375-385, ISSN: 0277-027X
The influence of pre-strain and pre-stress on creep crack growth behaviour of 316H austenitic steels is studied experimentally and numerically in this paper. Compact tension, C(T), specimens (25mm thickness) have been extracted from two steam headers, one as-received and one uniformly compressed to the strain value of 8%. The C(T) specimen extracted from the as-received header was compressed, introducing a non-uniform strain field. Creep crack growth (CCG) tests were performed at 550°C. Comparisons have been provided with the results from as-received C(T) specimens. Finite element (FE) analysis has been carried out to simulate the CCG behaviour of the C(T) specimens. By choosing the problem parameters appropriately, good agreement may be achieved between the FE predictions and the creep data. Copyright © 2012 by ASME.
Kim NH, Kim YJ, Davies CM, et al., 2012, Creep failure simulations for 316H at 550°C, American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, Vol: 3, Pages: 325-330, ISSN: 0277-027X
In this work a method to simulate failure due to creep is proposed using finite element damage analysis. The creep damage model is based on the creep ductility exhaustion concept. Incremental damage is defined by the ratio of incremental inelastic (plastic & creep) strain and multi-axial ductility. A simple linear damage summation rule is applied. When accumulated damage becomes unity, element stresses are reduced to almost zero to simulate progressive crack growth. The model is validated through comparison with experimental data on various sized compact tension, C(T), specimens of 316H stainless steel at 550 °C. The influence of the inelastic strain rate on the uniaxial ductility is considered. Good agreement is found between the simulated results and the experimental data. Copyright © 2012 by ASME.
Biglari F, Lombardi P, Budano S, et al., 2012, Predicting damage and failure under low cycle fatigue in a 9Cr steel, FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, Vol: 35, Pages: 1079-1087, ISSN: 8756-758X
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- Citations: 17
Mehmanparast A, Biglari F, Davies CM, et al., 2012, An Investigation of Irregular Crack Path Effects on Fracture Mechanics Parameters Using a Grain Microstructure Meshing Technique, Journal of Multiscale Modelling, Vol: 4, Pages: 1250001-1250021, ISSN: 1756-9737
A sub-grain size finite element modelling approach is presented in this paper to investigate variations in fracture mechanics parameters for irregular crack paths. The results can be used when modelling intergranular and transgranular crack growth where creep and fatigue are the dominant failure mechanisms and their crack paths are irregular. A novel method for sub-grain scale finite element mesh consisting of multiple elements encased in ~50–150 μm-sized grains has been developed and implemented in a compact tension, C(T), mesh structure. The replicated shapes and dimensions were derived from an isotropic metallic grain structure using representative random sized grain shapes repeated in sequence ahead of the crack tip. In this way the effects of crack tip angle ahead of the main crack path can be considered in a more realistic manner. A comprehensive sensitivity analysis has been performed for elastic and elastic-plastic materials using ABAQUS and the stress distributions, the stress intensity factor and the J-integral have been evaluated for irregular crack paths and compared to those of obtained from analytical solutions. To examine the local and macroscopic graph path effects on fracture mechanics parameters, a few extreme cases with various crack-tip angles have been modelled by keeping the macroscopic crack path parallel to the axis of symmetry. The numerical solutions from these granular mesh structures have been found in relatively good agreement with analytical solutions.
Nezhad HY, O'Dowd NP, Davies CM, et al., 2012, STUDY OF CREEP RELAXATION BEHAVIOUR OF 316H AUSTENITIC STEELS UNDER MECHANICALLY INDUCED RESIDUAL STRESS, PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE, PVP 2011, VOL 6, A AND B, Pages: 197-204
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- Citations: 1
Davies CM, Wimpory RC, Dean DW, et al., 2012, SPECIMEN GEOMETRY EFFECTS ON CREEP CRACK INITIATION AND GROWTH IN PARENT MATERIALS AND WELDMENTS, ASME Pressure Vessels and Piping Conference, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 153-161
Yang H, Davies CM, Dear JP, 2012, QUANTIFICATION OF CREEP CAVITY EVOLUTION USING A NOVEL REPLICA IMAGE PROCESSING TECHNIQUE, ASME Pressure Vessels and Piping Conference, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 93-99
Narayanan A, Morris A, Davies CM, et al., 2012, OPTICAL STRAIN MONITORING TECHNIQUES, ASME Pressure Vessels and Piping Conference, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 81-+
Kapadia P, Davies CM, Dean DW, et al., 2012, NUMERICAL SIMULATION OF RESIDUAL STRESSES INDUCED IN COMPACT TENSION SPECIMENS USING ELECTRON BEAM WELDING, ASME Pressure Vessels and Piping Conference, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 1115-1124
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- Citations: 1
Davies CM, Nagy P, Narayanan A, et al., 2012, CONTINUOUS CREEP DAMAGE MONITORING USING A NOVEL POTENTIAL DROP TECHNIQUE, ASME Pressure Vessels and Piping Conference, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 35-+
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- Citations: 4
Narayanan A, Morris A, Davies CM, et al., 2012, RECENT DEVELOPMENTS IN ARCMAC AND RELATED CREEP STRAIN MONITORING TECHNIQUES, ASME Pressure Vessels and Piping Conference, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 331-+
Mehmanparast A, Davies CM, Ardakani M, et al., 2012, A Microstructural Study of Compressive Plastic Pre-Strain Effects on Creep Damage Behaviour of Type 316H Stainless Steel, ASME Pressure Vessels and Piping Division Conference, AMER SOC MECHANICAL ENGINEERS
Mehmanparast A, Davies CM, Wimpory RC, et al., 2012, Quantification of Residual Stresses Induced by Prior Loading at High Temperatures, ASME Pressure Vessels and Piping Division Conference, AMER SOC MECHANICAL ENGINEERS
Kamel S, Vanagosoom T, Shanthenu P, et al., 2012, A NOVEL FRACTURE MECHANICS SPECIMEN TO INVESTIGATE THE EFFECT OF RESIDUAL STRESS AND CRACK-TIP CONSTRAINT ON FRACTURE, ASME Pressure Vessels and Piping Conference, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 1339-1345
Oh C-S, Kim N-H, Kim Y-J, et al., 2011, Creep failure simulations of 316H at 550 °C: Part I - A method and validation, ENGINEERING FRACTURE MECHANICS, Vol: 78, Pages: 2966-2977, ISSN: 0013-7944
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- Citations: 79
Strobl M, Hilger A, Boin M, et al., 2011, Time-of-flight neutron imaging at a continuous source: Proof of principle using a scintillator CCD imaging detector, 9th World Conference on Neutron Radiography (WCNR-9), Publisher: ELSEVIER, Pages: 149-155, ISSN: 0168-9002
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- Citations: 17
Webster GA, Davies CM, Nikbin KM, 2011, Prediction of creep crack growth in the presence of residual stress, MATERIALS AT HIGH TEMPERATURES, Vol: 28, Pages: 165-171, ISSN: 0960-3409
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- Citations: 2
Mehmanparast A, Davies CM, Nikbin KM, 2011, Evaluation of the Testing and Analysis Methods in ASTM E2760-10 Creep-Fatigue Crack Growth Testing Standard for a Range of Steels, ISSN: 1546-962X
The development of the ASTM E2760-10, “Creep/Fatigue Crack Growth Testing” standard has initiated a phase of testing, analysis, and round robin initiatives associated with high temperature cyclic loading crack growth tests. Creep and fatigue are two complex independent mechanisms which may assist each other to drive the crack. A simplification of the macro creep/fatigue crack growth response of structures is therefore required. Using a linear cumulative damage method, as proposed in ASTM E2760, and other codes of practice, data for a range of steels are analysed. Limited crack growth data, using test methods similar to ASTM E2760, from previous collaborative projects for a range of steels are presented and analysed to identify the difficulties in the process. Creep-fatigue crack growth tests at frequencies ranging from 10 to 0.001 Hz are examined to consider the testing methodologies and in order to assess the effect of data scatter, dwell times, and the interaction region between creep crack growth (CCG) and fatigue crack growth mechanisms. Given the limited data available and the level of scatter, it can still be shown that the linear cumulative summation of static and high frequency data may be sufficient to predict creep/fatigue interaction both in terms of C* and ΔK, and the level of creep ductility will dictate appropriateness of the correlating parameter employed. Finally, in order to show that the level of data scatter can be dealt with in a predictive manner, the crack initiation and growth rates are also analysed using the NSW CCG model.
Madhi E, Sposito G, Davies CM, et al., 2011, IN-SITU CREEP MONITORING USING THE POTENTIAL DROP METHOD, 37th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE), Publisher: AMER INST PHYSICS, Pages: 1631-1638, ISSN: 0094-243X
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- Citations: 6
Li D-F, O'Dowd NP, Davies CM, et al., 2011, Microscale prediction of deformation in an austenitic stainless steel under uniaxial loading, European Journal of Mechanics - A/Solids, Vol: 30, Pages: 748-760
Davies CM, Dean DW, Mehmanparast N, et al., 2010, Compressive pre-strain effects on the creep and crack growth behaviour of 316H stainless steel, American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, Vol: 6, Pages: 323-330, ISSN: 0277-027X
The effects of compressive plastic pre-strain on the creep deformation and crack growth behaviour of Type 316H stainless steel have been examined. Creep crack growth (CCG) tests have been performed on compact tension specimens of material which had been uniformly pre-strained by 4% and 8% in compression at room temperature. the CCG behaviour of the pre-compressed material has been interpreted in terms of the creep fracture mechanics parameter C* and compared with that of a significant data set of as-received (un-compressed) specimens and with CCG models. All creep testing has been performed at a temperature of 550 °C. High CCG rates, for a given value of C* have been observed for the pre-compressed material, compared with those of as-received material and these data follow the same trends as the long-term CCG data for as-received material. These observations are explained in terms of specimen constraint effects and variations in creep ductility.Copyright © 2010 by ASME.
Li DF, O'Dowd NP, Davies CM, et al., 2010, A review of the effect of prior inelastic deformation on high temperature mechanical response of engineering alloys, INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING, Vol: 87, Pages: 531-542, ISSN: 0308-0161
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- Citations: 27
Murakawa H, Beres M, Davies CM, et al., 2010, Effect of low transformation temperature weld filler metal on welding residual stress, SCIENCE AND TECHNOLOGY OF WELDING AND JOINING, Vol: 15, Pages: 393-399, ISSN: 1362-1718
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- Citations: 42
Webster GA, Davies CM, Nikbin KM, 2010, Assessment of creep crack growth due to stress relief, INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, Vol: 47, Pages: 881-886, ISSN: 0020-7683
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- Citations: 23
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