Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

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Questions

Quick questions

You should be able to answer these questions without too much difficulty after studying this TLP. If not, then you should go through it again!

  1. How does elastic deformation of a honeycomb with hexagonal cells with some faces aligned parallel to the loading axis take place?

    a By elastic compression of the vertical faces
    b By elastic buckling of the vertical faces
    c By elastic bending of the diagonal faces

Deeper questions

The following questions require some thought and reaching the answer may require you to think beyond the contents of this TLP.

  1. How might elongating the cells of a hexagonal honeycomb in the direction of loading change E/ES for a given relative density?

    a Decrease it
    b Have no effect
    c Increase it

Quick questions

You should be able to answer these questions without too much difficulty after studying this TLP. If not, then you should go through it again!

  1. What is the criterion for the onset of yielding in a honeycomb?

    a That somewhere the stress should exceed the flow stress through the thickness of the film
    b That the maximum stress in the face exceeds the material flow stress
    c That the stress at the centre of the face should exceed the material flow stress

Deeper questions

The following questions require some thought and reaching the answer may require you to think beyond the contents of this TLP.

  1. For a highly porous structure E/ES is proportional to (ρ/ρS)n. In which case will the structure show an increased bending stiffness? Hence explain why many porous materials are often used as the core in sandwich structures.

    a n > 2
    b n = 2
    c n < 2

  2. Consider a honeycomb loaded with some faces parallel to the compressive loading direction, in which the shape of the hexagonal cell is such that θ < 0, how would the material deform elastically in the transverse direction?

    a contract inwards
    b no tranverse movement
    c expands outwards