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When is strong and when is weak by using extended finite element method?

Submitted by pfliu@zju.edu.cn on
research
extended finite element method
strong or weak discontinuity

As we know, the extended finite element method has been well used to simulate the localization band propagation and crack propagation without remeshing. It can deal with both strong discontinuity problems (displacement discontinuity) and weak discontinuity problems (strain or acceleration discontinuity). Now, I have always a question: when is strong and when is weak discontinuity using XFEM? In other words, what is the difference for the interpolation function and level set function or other function between strong and weak discontinuity? Thanks.

Liu pengfei

Modelling fracture of graphene using Griffith’s criterion and quantized fracture mechanics

Submitted by Nuwan Dewapriya on
research
fracture mechanics
molecular dynamics
nanomechanics
continuum mechanics
graphene
crack propagation
Griffith's equation
quantized fracture mechanics
fracture of graphene
armchair
zigzag

In armchair graphene sheets, crack propagates perpendicular to the applied strain, whereas crack propagation in zigzag sheets occurs at an angle to the straining direction. This occurs due to different bond structure along armchair and zigzag directions as shown in Fig. 1. Videos 1 and 2 show the fracture of armchair and zigzag sheets, respectively.

 

Fig. 1: Armchair and zigzag directions of graohene

The reality of English living rooms – A comparison of internal temperatures against common model assumptions

Submitted by Laure Ballu on
research
BREDEM;Building stock models;Heating demand temperature; Heating duration; Internal temperature; Variability

Highlights of this open access article published in Energy and Buildings:

'Innovative solutions please, as long as they have been proved elsewhere: the case of a polished lime-pozzolan concrete floor'

Submitted by Laure Ballu on
research
innovation; implementation; polished lime-pozzolan concrete; case-study; univerity of Bath; Ramboll

Highlights of this open access article published in Case Studies in Construction Materials:

Heating patterns in English homes: national survey vs common model assumptions

Submitted by Laure Ballu on
research
Heating patterns; Heating demand temperature; Heating duration; Occupancy schedules; Building stock models; BREDEM; UCL Energy Institute

Hightlights of this open access article published in Building and Environment:

• Building stock models need to revise some of their assumptions on space heating.

• Weekends and weekdays are similar in their heating pattern and duration.

• Estimated heating demand temperature is slightly lower than the assumed 21 °C.

• Homes differ widely in their hours of heating and their demand temperature.

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