brittle fracture under compression/impact
brittle fracture under compression/impact
(OP)
Simple question.
If I tap a spherical marble with a hammer, it may split in two.
Would that be brittle fracture?
If so, is there tensile stress involved?
If I tap a spherical marble with a hammer, it may split in two.
Would that be brittle fracture?
If so, is there tensile stress involved?
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RE: brittle fracture under compression/impact
Same question. Is it a brittle failure? Is there an tensile stress in this problem?
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RE: brittle fracture under compression/impact
cheers,
gr2vessels
RE: brittle fracture under compression/impact
Yes it is a brittle fracture and no I don't think there is any tensile stress involved if the marble is put purely under compression.
regards
desertfox
RE: brittle fracture under compression/impact
Yes, there are tensile stresses. Imagine a small void/pore/crack in the marble (they are there, just maybe not resolvable by unaided eyesight). Even if there is a compressive stress on one axis of the flaw, the perpendicular axis has a tensile stress.
This is an easy thought experiment - there must be tensile stresses, otherwise the marble will not fracture. If you hydrostatically compress the marble (bottom of the ocean, inside a pressure vessel), there is no fracture.
RE: brittle fracture under compression/impact
Yes your right about tensile stresses at the voids.
I looked at it from a point of view of a Mohr stress circle
with only a compressive force acting.
I never considered a void or flaw, out of interest would these tensile stresses be calculatable.
desertfox
RE: brittle fracture under compression/impact
RE: brittle fracture under compression/impact
RE: brittle fracture under compression/impact
I found a couple of sites that might be of interest:-
http://
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regards
desertfox