Understanding Axial Loading On a Member

[tomtomtom1]

Homework Statement

Understanding Axial Loading On A Member

Relevant Equations

Understanding Axial Loading On A Member

Hello all

I was hoping someone could explain Axial Forces with respect to the diagram below.

I know that Axial forces relate to compression or tension and if the forces go through the centriod then it is said to be concentric or if it is not going through the centriod then its said to be eccentric.

I know that Force 1 and 2 are forces that are causing the axial loading but doesn't Force 3 and 4 also cause the member to be in tension so why isn't Force 3 and 4 considered to be the axial loading?

I just want to get it correct in my head and I'm struggling.

Can someone explain?

Thanks

 

[haruspex]

Homework Statement:: Understanding Axial Loading On A Member
Homework Equations:: Understanding Axial Loading On A Member

Hello all

I was hoping someone could explain Axial Forces with respect to the diagram below.

I know that Axial forces relate to compression or tension and if the forces go through the centriod then it is said to be concentric or if it is not going through the centriod then its said to be eccentric.

I know that Force 1 and 2 are forces that are causing the axial loading but doesn't Force 3 and 4 also cause the member to be in tension so why isn't Force 3 and 4 considered to be the axial loading?View attachment 254622I just want to get it correct in my head and I'm struggling.

Can someone explain?

Thanks

In the context of rods, beams etc. the axis is considered to be in the long direction. The other pair of forces you show may be termed transverse.
But it is not clear how those other two forces are applied. Are they localised to the places shown, uniformly distributed along strips at top and bottom, uniformly distributed over half cylinders, a result of rotation about the axis ("centrifugal"), ...?

 

[tomtomtom1]

In the context of rods, beams etc. the axis is considered to be in the long direction. The other pair of forces you show may be termed transverse.
But it is not clear how those other two forces are applied. Are they localised to the places shown, uniformly distributed along strips at top and bottom, uniformly distributed over half cylinders, a result of rotation about the axis ("centrifugal"), ...?

Hi haruspex

I think i get, axial loads act through the centriod of a member or parallel to a member - the bit that cleared things up was the Through / Parallel part.

It makes sense to me thank you.