From my notes:
Voilement Local buckling [ECCS]; shear buckling [Arcelor]

SHEAR BUCKLING of hat-stiffened panel analyzed using a simple model. where is the shear buckling load factor, which is a function of panel aspect ratio . ...
www.nasa.gov/centers/dryden/pdf/88342main_H-2019.pdf

The global SHEAR BUCKLING load was found to be several times higher than the local shear buckling load. The classical shear buckling theory for a flat plate ...
citeseer.ist.psu.edu/98880.html

The two important failure modes of these materials are compressive buckling and SHEAR BUCKLING, and design allowables must be developed and ...
iar-ira.nrc-cnrc.gc.ca/smpl/smpl_4b1_e.html –

Due to an applied shear stress, the trapezoidally corrugated web can fail by three different SHEAR BUCKLING modes: local, global, and interactive shear ...
linkinghub.elsevier.com/retrieve/pii/S0141029607004130

lateral-torsional buckling and SHEAR BUCKLING of webs), ... GLOSSARY. A limit state is a condition beyond which the structure no longer satisfies the ...
www.fgg.uni-lj.si/kmk/ESDEP/master/wg01b/l0220.htm

To analyse the panel’s buckling, software G gives all the possible buckling failures: X direction compression buckling, local X direction compression buckling, POSITIVE SHEAR BUCKLING, LOCAL POSITIVE SHEAR BUCKLING, NEGATIVE SHEAR BUCKLING and LOCAL NEGATIVE SHEAR BUCKLING.
http://upcommons.upc.edu/pfc/bitstream/2099.1/3835/1/53946-1...


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Note added at 16 hrs (2009-03-18 07:17:06 GMT)
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AFAIK, both flambement and voilage, and in addition déversement, are different forms of buckling:

For the European Convention for Constructional Steelwork:
buckling - flambement
flambement par flexion - flexural buckling
f. par torsion - torsional buckling
f. par flexion-torsion - torsional flexural buckling
f. en milieu élastique - buckling in an elastic medium

déversement (d'une poutre fléchie) - lateral-torsional buckling

voilement - local buckling

gauchissement - warping (in my exp. this applies to rails, for example)

There are obviously many kinds of buckling, and it is possible that the most appropriate term may depend on the shape of the object, i.e. beam as a whole, web of a beam, sheetmetal panel, etc., not just because the shape is different but because the forces involved are different. Note that at least a couple of the refs above apply to webs (your âme).

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Note added at 17 hrs (2009-03-18 07:33:56 GMT)
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In this context it may be necessary to check several aspects of an element's resistance. These aspects might include the resistance of the cross-section (as a check on local buckling and yielding), and resistance to various forms of buckling (such as overall buckling in compression, lateral-torsional buckling and SHEAR BUCKLING OF WEBS), as well as a check that the structure does not transform into a mechanism
http://www.fgg.uni-lj.si/kmk/ESDEP/master/wg01b/l0220.htm

3.2 Lateral-Torsional Buckling of the Girder ... SHEAR BUCKLING is likely to prevent the full WEB shear resistance from being attained in slender webs. ...
www.esdep.org/members/master/wg08/l0410.htm

"Shear buckling" is used in the Eurocodes, which I'm positive your customer would wish to comply with, even if there is an alternative term.
SHEAR BUCKLING resistance is treated by cross-reference to EUROCODE 3, ... (7) Resistances to lateral-torsional buckling in principle use 7Rd, ...
books.google.com/books?isbn=0727716905...

See also books.google.com/books?isbn=0849315697..., p. 6-32, para. 6.6.4.2. Shear Strength, which explains that SHEAR BUCKLING IS ONE MODE OF FAILURE OF BEAM WEBS, and additionally depends on the depth to thickness ratio ...

Also books.google.com/books?isbn=0849372356... p. 126

For a diagram of what shear buckling involves (def. p. 146):
books.google.com/books?isbn=0415268443..., p. 147

This document DOES NOT COVER the following aspects, WHICH ARE COVERED ADEQUATELY IN THE EXISTING CODES:

• Transverse reinforcement in the concrete slab

• Exact arrangement of the stud layout (grouping etc.)

• Detailed design of the concrete slab in the non-composite part of the partially composite beam

• SHEAR BUCKLING OF THE WEB and design of stiffeners
http://www.rlsd.co.uk/pdf/2_composite_beam_guide.pdf


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Note added at 17 hrs (2009-03-18 07:35:59 GMT)
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As for warping shear, that surely must be something like "cisaillement par gauchissement" (ou par voilement, à la rigueur), not "voilement par cisaillement", i.e. cause and effect are inverted.

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Note added at 17 hrs (2009-03-18 07:41:10 GMT)
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I haven't looked into shear warping, but :
a) there are ghits with both "shear warping" and "shear buckling", which suggests that thay may be different animals;
b) I would imagine "shear warping" involves twisting of the element as a whole, i.e. in the case of a beam, deformation and disalignment of the flanges relative to each other, whereas "shear buckling" involves deformation of the web alone.

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Note added at 17 hrs (2009-03-18 08:07:13 GMT)
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Your "voilement/flambement" is like "apes/monkeys" (singes) or "baleines/cachalots" (whales) and can be simplified to "buckling".

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Note added at 19 hrs (2009-03-18 10:03:27 GMT) Post-grading
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For that diagram, try http://books.google.com/books?id=E8lvGSQib4wC&pg=PA147&lpg=P...

At the bottom of the page there's also an illustration of lateral-torsional buckling of a cantilever, which is much what I imagine warping to be.

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Note added at 19 hrs (2009-03-18 10:12:39 GMT) Post-grading
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Also http://books.google.com/books?id=MbjxA_Y2e54C&pg=PA101&lpg=P...

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Note added at 19 hrs (2009-03-18 10:20:30 GMT) Post-grading
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Have been trying unsuccessfully to track those other failed links. But there's plenty out there if you want to know more: enter "shear buckling" + web + failure for instance:

http://books.google.com/books?id=IpFwi995cZkC&pg=PA812&lpg=P...