Young's modulus times second moment of area (1 Viewer)

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Pietair

Good day,

Im am wondering what you get when you determine the following of a bar during a bending experiment:

(E x I) / y

E = the Young's Modulus [kgf/mm^2]
I = Second moment of area [mm^4]
y = half of the bar height [mm]

Is there a name for this term? And what does this term represent?

Mapes

Homework Helper
Gold Member
The reciprocal of this term is the magnitude of the normal strain at the surface per unit bending moment (because $|\sigma_{\rm{max}}|=My/EI$). EI alone is called the flexural rigidity.

Pietair

Allright, thanks a lot.

Then I have got one question left:

In the formula:
(M/I) = (E/R)

What does "R" represent?

Mapes

Homework Helper
Gold Member
The radius of curvature of the bending beam.

The Physics Forums Way

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving