On the Multiscale Mechanics of Plasticity and Damage in Magnesium

Add to your list(s) Download to your calendar using vCal

• Padmeya Indurkar,CUED
• Friday 30 October 2020, 14:00-14:30
• zoom 853 4440 7455 - for password email hh463@cam.ac.uk .

If you have a question about this talk, please contact Hilde Hambro.

Microstructure and stress state closely interact in determining the strength and fracture resistance of ductile metals. While a fair understanding of the microstructure-stress interaction on strength, deformation stability and damage has been achieved for common engineering alloys, the same is not true for low symmetry hexagonal close packed (HCP) metals, e.g. magnesium (Mg). Mg, its alloys and composites are promising candidates as lightweight structural metals owing to their high power-to-weight ratio. However, the HCP structure of Mg exhibits complex deformation processes resulting in an intrinsic plastic anisotropy and tension-compression asymmetry at the single crystal scale, which is pervasive even in polycrystals. To that end, we probe the effect of textural variability and intrinsic plastic anisotropy on the macroscopic load-deformation characteristics of polycrystalline Mg aggregates using crystal plasticity finite element modeling (CPFEM). Our analysis underscores the need for a concerted multiscale computational effort for improved representation of the micromechanics in Mg at the structural length-scales. In this pursuit, we develop a multi-surface plasticity model (MSM) which embeds the key micromechanical features of plasticity and yet promises an enhanced computational efficacy. The MSM is assessed with the 3D datasets generated from a finer scale representation using CPFEM . The MSM is employed to study plastic flow in notched bars and micromechanics of void growth. In conjunction with the CPFEM , application of the MSM enables a multiscale perspective of deformation and damage evolution in Mg. Extended investigations along this path would guide development of lightweight and damage-tolerant Mg alloys.

This talk is part of the Engineering - Mechanics and Materials Seminar Series series.

This talk is included in these lists:

• All Talks (aka the CURE list)
• Cambridge University Engineering Department Talks
• Cambridge talks
• Centre for Smart Infrastructure & Construction
• Computational Continuum Mechanics Group Seminars
• Engineering - Mechanics and Materials Seminar Series
• Engineering - Mechanics, Materials and Design (Div C) - talks and events
• Featured lists
• Interested Talks
• Lennard-Jones Centre external
• School of Technology
• Trust & Technology Initiative - interesting events
• bld31
• zoom 853 4440 7455 - for password email hh463@cam.ac.uk

Note that ex-directory lists are not shown.