Tensile Strength and Yield Strength Sad
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Posted by: ashok_k

12/22/2005, 00:25:55

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Hi all....

I am trying to avaluate the Tensile Strength and Yield Strength of aluminum forgings and get different results for rectangular and round test sections.

Could someone explain why?

Regards,
Ashok.







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Re: Tensile Strength and Yield Strength
Re: Tensile Strength and Yield Strength -- ashok_k Post Reply Top of thread Forum
Posted by: swearingen

12/22/2005, 08:49:13

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As everyone knows, geometry has a great effect on how materials behave under load. That is why materials are tested by standards such as ASTM. The standards give a specific size and shape of each specimen so that the test data can be compared apples to apples.

To answer your question directly - you will get stress concentrations in one shape that you don't get in the other, resulting in what appears to be an "early" failure for the same cross sectional area. In this case, it's probable caused by shear lag.







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Re: Tensile Strength and Yield Strength
Re: Re: Tensile Strength and Yield Strength -- swearingen Post Reply Top of thread Forum
Posted by: ashok_k

12/23/2005, 00:03:26

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Thankx..
But if I take std stresses given in design data for the perticular material,for design calculations.
Is that gives correct analysis for loads even if shapes are differant?
Regards,
Ashok.






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Re: Tensile Strength and Yield Strength
Re: Re: Tensile Strength and Yield Strength -- ashok_k Post Reply Top of thread Forum
Posted by: ashok_k

12/28/2005, 09:56:21

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THANK YOU FOR RESPONCE,
I AM DOING HAND CALCULATION.
SO, WE COME TO KNOW THAT STD. SRESSES MAY CHANGE ACCORDING TO SHAPE.
AM I CORRECT?






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Re: Tensile Strength and Yield Strength
Re: Re: Tensile Strength and Yield Strength -- ashok_k Post Reply Top of thread Forum
Posted by: fluidspin

12/28/2005, 00:52:57

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Hi, your correct analysis will have to take into account the shape. Which means to say you will need to have different calculations for each type, say the rectangular and another for the cylindrical shaped.

Std stresses applies for the material in question but as mentioned by another forumer, geometry affects stresses no doubt. Loads are determined by you and factor this same value into your calculation for each shape you should get a respective result. Don't mind me asking, are you using a FE software to do this or by hand calculation?







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