RE: But why? The question of ASTM A312-TP321

From: <Steve>
Date: Wed Mar 17 2004 - 01:03:00 EST

Normally the thinner the material, the higher the tensile strength. Thin sections material properties can be conditioned (e.g. heat treatment) more accurately than thick sections.
Also there is less likelihood of built-in secondary (e.g. bending) stresses.

A thin section is more flexible and can align itself more accurately to the applied load. This gives a higher apparent tensile strength as there is no induced bending.

Many good "strength of materials" textbooks will give a detailed explanation of this perplexing but measurable phenomenon.

Cheers

Steve

-----Original Message-----
From: M. Tageldin [mailto:magedtag@hotmail.com] Sent: Wednesday, March 17, 2004 6:39 PM
To: <a href="/group/PipingDesign/post?postID=LoBMc9o-rpssF5Tfub3_dvUAdEO_LzT_RtvxSTpoyfi5G4Hk8eNODB35n3vQbVGysOXmysag0gD9HLu0cXmfSMNc">PipingDesign@yahoogroups.com</a> Subject: Re: [PipingDesign] But why? The question of ASTM A312-TP321

Dear Friends;
I am not an expert in such subject, but I wanted to reform the question. How a material can have two different strengths depending on the thickness?. My knowledge tills me that strength is a constant whatever the dimensional changes of an element.

Regards
Maged A. Tageldin
Sr. Mechanical Engineer
SETE Technical Services S.A.

• Original Message -----
  From: chenysh
  To: <a href="/group/PipingDesign/post?postID=LoBMc9o-rpssF5Tfub3_dvUAdEO_LzT_RtvxSTpoyfi5G4Hk8eNODB35n3vQbVGysOXmysag0gD9HLu0cXmfSMNc">PipingDesign@yahoogroups.com</a>
  Sent: Wednesday, March 17, 2004 3:39 AM
  Subject: [PipingDesign] But why? The question of ASTM A312-TP321
  

Dear all experts,
In the Standard of ASTM A312, I have a doubt about the material TP321.
As the Standard described, The Tensile Requirement of this material, t<3/8
in, is 75ksi; t>3/8in, is 70ksi. But in the Old Edition, there is no these differences.

Who can give me a explain.
Thanks for your any coments.

regards,

ChenYueshuang

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Received on Wed Mar 17 01:03:00 2004