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Tensile strength vs Tear Strength

04/15/2008 10:42 AM

What's the difference?

My understanding of tensile strength is the threshold of a material before it tears or rips. If this is the case, is tear strength synonymous?

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#1

Re: Tensile strength vs Tear Strength

04/15/2008 11:05 PM

Tensile strength is longitudinal. shear strength is perpendicular to longitudinal axis.

Tensile is ultimate strength material wiithstands; shear is more related to material yielding rather than failing.

Your choice of the word tearing implies a potential 'suddenness.'

A paper bag can carry a bowling ball; but held outstretched a baseball can be thrown through it. this illustration has an 'impact' aspect to it, but is intended to get you to understand directional aspect of shear.

Their is a frightening amount of math available to explain this , wikipedia is as easy a place to start as any.

milo

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#2
In reply to #1

Re: Tensile strength vs Tear Strength

04/15/2008 11:37 PM

So you say Tear Strength is a combination of Shear and Tensile strength?

Such as:http://www.ides.com/property_descriptions/ASTMD624.asp

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#3

Re: Tensile strength vs Tear Strength

04/16/2008 3:20 AM

Hi,

Have a look to any fracture mechanics text. You will find this type of picture that perhaps will help you to understand the different ways of fracture. Tensile strength is related with quasi static load in normal direction of fracture (similar to Mode I) and tearing more similar to Mode III.

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#5
In reply to #3

Re: Tensile strength vs Tear Strength

04/16/2008 10:02 AM

Kwetz, your pictures did a far better job than my attempt using words.

Good post.

milo

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#6
In reply to #5

Re: Tensile strength vs Tear Strength

04/16/2008 11:20 AM

Thank you Milo,

I was just preparing a Power Point presentation about fracture mechanics and had the figure in the tool bar...

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#4

Re: Tensile strength vs Tear Strength

04/16/2008 8:22 AM

Take a rectangle of material of known width. Grip firmly and evenly, and pull from both ends so the material tends to elongate. The force per width at break is tensile strength.

Take another piece of the same material and start a slit at one end. Now grip with both hands on the same end, on either side of the slit. One hand pull up; one hand pull down. The force to continue the slit telephone-book-ripping-style is tear strength.

There are a lot of variations on these themes. Every industry has its methods and standards. Hope this helps.

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#7
In reply to #4

Re: Tensile strength vs Tear Strength

04/19/2008 10:34 AM

Mag: This the perfect answer to the question. Tear strength is mostly associated with mechanical testing of textiles and the test you describe is often called a trouser tear test.

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#8

Re: Tensile strength vs Tear Strength

06/20/2008 9:31 AM

Great comments guys!


Thank you!

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#9

Re: Tensile strength vs Tear Strength

10/31/2014 4:06 AM

Dear Mr.carcru,

The Tensile Strength is developed when the force is applied PARALLEL to the AXIS of round or plate OR hxagon etc..

Tear Stress will ripping apart when the force applied to Perpendicular Axis. This explanation of Tear Stress is closer to SHEAR STRESS.

DHAYANANDHAN.S

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Users who posted comments:

Anonymous Poster (1); davidtphillips (1); dhayanandhan (1); gigaconcept.com (1); Kwetz (2); Mag (1); Milo (2)

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