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# Mohrs Circle failure for all materials?

## Mohrs Circle failure for all materials?

(OP)
Reading Das Principles of Geotechnical Engineering, chapter introducing shear failure.

A statement was made, that Mohr himself claims “all” material fail by a combination of shear and normal stresses.

1) Where can one find the supporting arguments?
2) What about a general case of a thin steel plate in tension. From lab experiments, the rupture line is basically linear. Not to mention, no stresses on minor principal planes, this no Mohrs Circle.

Thanks:)

P.S. I apologize if this question seems out of place wrt this forum. Figured a good place to start.

### RE: Mohrs Circle failure for all materials?

steel in tension would return a circle whether the major and minor stresses are positive or negative does not control the Mohr's circle.

f-d

ípapß gordo ainÆt no madre flaca!

### RE: Mohrs Circle failure for all materials?

(OP)
Poissons effect is negative stress?

### RE: Mohrs Circle failure for all materials?

stress is not a unit of Poisson's ratio. And, yes, Poisson's ratio works in compression or tension. Not sure the intent of your statement ending in a question mark.

f-d

ípapß gordo ainÆt no madre flaca!

### RE: Mohrs Circle failure for all materials?

(OP)
With respect to a thin steel plate:

Initially, it did not occur to me a differential element would be under tension about the major axis, and negative tension about the minor axis. Negative tension would be compression, presumably explained by Poissons effect.

The question was general, not requiring a rigorous explanation. Unless my conceptual understanding was seriously flawed.

### RE: Mohrs Circle failure for all materials?

(OP)
Sorry if that’s confusing.

Yes, it was a question.

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