Tensile Stress: Understanding Its Effects on Materials and Structures

[chetzread]

Homework Statement

can someone explain about part b (tensile stress) here? in which way does the stress act?

Homework Equations

The Attempt at a Solution

FromW wikipedia, tensile stress refres to the stress to break a rope...How does it related to the case above?

 

[SteamKing]

Homework Statement

can someone explain about part b (tensile stress) here? in which way does the stress act?

You really can't look at figure E1.7 and puzzle this out?

The Attempt at a Solution

FromW wikipedia, tensile stress refres to the stress to break a rope...How does it related to the case above?

Well, can you break a rope by pushing the ends together?

Have you ever held the ends of a rope and pulled them apart?

This is stuff kids learn when they're about 8 years old.

 

[chetzread]

You really can't look at figure E1.7 and puzzle this out?
Well, can you break a rope by pushing the ends together?

Have you ever held the ends of a rope and pulled them apart?

This is stuff kids learn when they're about 8 years old.

ok,it's pulling stress...
i don't understand the area 7.85(110-20), can you explain about it?

 

[SteamKing]

ok,it's pulling stress...
i don't understand the area 7.85(110-20), can you explain about it?

You have to start at part a) of the problem. That's where the thickness of the plates is established (t = 7.85 mm)

The plate is 110 mm wide and has a 20-mm diameter rivet punched through the middle. What's the net width of material where the rivet is located?

These are fairly simple problems to figure out from the diagrams given. If you have this much difficulty now, it's not going to look good on any exams you'll have to take.

 

[chetzread]

You have to start at part a) of the problem. That's where the thickness of the plates is established (t = 7.85 mm)

The plate is 110 mm wide and has a 20-mm diameter rivet punched through the middle. What's the net width of material where the rivet is located?

These are fairly simple problems to figure out from the diagrams given. If you have this much difficulty now, it's not going to look good on any exams you'll have to take.

i'm confused between tensile stress and bearing stress now, arent they the same?

 

[Justus]

Homework Statement

can someone explain about part b (tensile stress) here? in which way does the stress act?

To answer your first question, simply the largest tensile stress can be found at the middle. Why? Because this is the part where most of the expansion takes place. You seem confused at this

ok,it's pulling stress...
i don't understand the area 7.85(110-20), can you explain about it?

It's because the formula for area here is (d)(t) where d is diameter and t is thickness thus (110-20) for the remaining area and t is (20)

 

[chetzread]

To answer your first question, simply the largest tensile stress can be found at the middle. Why? Because this is the part where most of the expansion takes place. You seem confused at thisIt's because the formula for area here is (d)(t) where d is diameter and t is thickness thus (110-20) for the remaining area and t is (20)

why
Because this is the part where most of the expansion takes place?

 

[SteamKing]

i'm confused between tensile stress and bearing stress now, arent they the same?

If these two stresses were the same, there would be no need to call them by different names.

The bearing stress is created where the body of the rivet shank "bears" on the plate material.

 

[Justus]

Say when you pull the two plates , where is the part the first to move ?

 

[chetzread]

Say when you pull the two plates , where is the part the first to move ?

the part closer to the force

 

[chetzread]

If these two stresses were the same, there would be no need to call them by different names.

The bearing stress is created where the body of the rivet shank "bears" on the plate material.

so, tensile stress is acted perpendicularly to the surface?

 

[SteamKing]

so, tensile stress is acted perpendicularly to the surface?

Depends on which surface you are taking about. Please be more specific and use dimensions if that helps.

 

[chetzread]

Depends on which surface you are taking about. Please be more specific and use dimensions if that helps.

i mean this. Force P is acting perpendicularly to cross section area = t(110-20), is it correct?

 

[SteamKing]

i mean this. Force P is acting perpendicularly to cross section area = t(110-20), is it correct?

Yes, that appears to be correct.