The effect of cyclic-loading generated intergranular strains on the creep deformation of a polycrystalline material

Mamun, Abdullah Al; Moat, Richard; Kelleher, Joe; Bouchard, P. J.

doi:10.1016/j.mtla.2019.100385

Cited by 8 publications

(2 citation statements)

References 30 publications

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“…6(d). Similar observations have been made for the {200} reflection in austenitic and ferritic steels as reported in (Ref 20,21). Figure 6(d) also shows that the lattice response of the {110} and {211} planes remain fairly linear even in the plastic regime for the lateral direction, thereby indicating that the planes undergo late yielding.…”

Section: In Situ Tensile Testsupporting

confidence: 86%

Experimental Investigation of Lattice Deformation Behavior in S355 Steel Weldments Using Neutron Diffraction Technique

Biswal

Mehmanparast

Ganguly

et al. 2021

J. of Materi Eng and Perform

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This study aims to investigate the influence of welding process on the elastic lattice deformation and its effects on fatigue and fracture behavior of S355 G10+M steel, which is widely used in fabrication of offshore wind turbine monopile structures. In situ neutron diffraction measurements were taken on cross-weld test samples at room temperature to monitor the evolution of intergranular strains under static and cyclic loading conditions. Both static and cyclic test results have shown that the {200} orientation exhibits the least load carrying capacity while {211} had the maximum stiffness. The hkl-specific response predicted using Reuss and Kröner model were found to agree well with experimental values obtained for the heat-affected zone for all the orientations; however, discrepancies between the experimental and model predictions have been observed for the base metal and weld metal. Moreover, the microstructural differences between the weld metal and heat-affected zone resulted in the maximum elastic–plastic strain mismatch at the interface of the two regions. The results from this experiment would be useful to understand the role of crystal-specific microstrains and lattice deformation on fatigue and fracture behavior of thick-walled monopile weldments.

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Section: In Situ Tensile Testsupporting

confidence: 86%

Experimental Investigation of Lattice Deformation Behavior in S355 Steel Weldments Using Neutron Diffraction Technique

Biswal

Mehmanparast

Ganguly

et al. 2021

J. of Materi Eng and Perform

View full text Add to dashboard Cite

show abstract

“…The influence of the generated cyclic deformation on creep in austenitic stainless steels from a macro-scale deformation has been investigated experimentally, with the findings indicating that the evolution of creep strain and stress relaxation can be affected by prior cyclic loading [6][7][8]. Additionally, experimental investigation on the local level using neutron diffraction has also been conducted by [9][10][11][12] to provide greater insight into the contribution of intergranular stresses generated during cyclic loading on the creep deformation. These studies have highlighted the differences in grain-to-grain interactions occurring during plasticity and creep resulting in different levels of anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Microstructure-informed, predictive crystal plasticity finite element model of fatigue-dwells

Agius

Mamun

Simpson

et al. 2020

Computational Materials Science

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Crystal plasticity finite element (CPFE) modelling is an effective tool from which detailed information on the meso-scale behaviour of crystalline metallic systems can be extracted and used, not only to enhance the understanding of material behaviour under different loading conditions, but also to improve the structural integrity assessment of engineering components. To be of full benefit however it must be demonstrated to not only predict the average global response of the material, but also the local behaviour, to provide insight into localised regions of stress and plastic strain. In this study, a slip system based constitutive model is developed to improve the simulation capability of time independent and time dependent plasticity. Comparison has been made between the macro-mechanical behaviour predicted by the model and previous experiments carried out at engineering length scale. Critically, the macromechanical behaviour predicted by the model has been examined against the behaviour of the materials at the meso-scale crystalline level measured by previous diffraction experiments. The robustness of the model is demonstrated on both the macro-and meso-scale through the successful prediction of macro-scale behaviour and lattice strain evolution under a variety of loading conditions. The model not only effectively recognised the influence of prior deformation on subsequent loading, but also complemented neutron diffraction data to enrich the understanding of the influence of an important loading condition on the deformation of grains within the material.

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Investigating grain-resolved evolution of lattice strains during plasticity and creep using 3DXRD and crystal plasticity modelling

Ashraf,

Ramadhan,

Mamun

et al. 2024

Acta Materialia

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The effect of cyclic-loading generated intergranular strains on the creep deformation of a polycrystalline material

Abstract: The Open University's repository of research publications and other research outputs The effect of cyclic-loading generated intergranular strains on the creep deformation of a polycrystalline material

Cited by 8 publications

References 30 publications

Experimental Investigation of Lattice Deformation Behavior in S355 Steel Weldments Using Neutron Diffraction Technique

Experimental Investigation of Lattice Deformation Behavior in S355 Steel Weldments Using Neutron Diffraction Technique

Microstructure-informed, predictive crystal plasticity finite element model of fatigue-dwells

Investigating grain-resolved evolution of lattice strains during plasticity and creep using 3DXRD and crystal plasticity modelling

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