- published: 01 Jan 2016
- views: 885855
Stressing is a technique developed in the 1960s to avert rail track problems that can occur when installing Continuous welded rail (CWR). When installing new rail the rail must be returned to its former temperature or length.
Unconstrained large sections of steel will shrink as the temperature drops and expand as it increases. Since the ends of CWR are fixed the rail will experience tensile stress in extreme cold and can fracture if it grows too great. In extreme heat, it will experience compressive stress and if that force grows too strong, the rail will buckle.
Imagine a length of CWR 1 kilometer long on track that has some stress in it. Each end of that rail is fixed to the track. Also imagine a 1 kilometer long length of rail lying on the ground next to the track. In a hot summer, the unconstrained rail lying next to the track is going to expand, and the rail fixed to the track will experience compression. The unconstrained rail will actually be longer than 1 kilometer. Likewise, in extreme cold, the unfixed rail will shrink and actually be shorther than 1 kilometer, while the rail that is constrained to 1 kilometer will experience tension.
There she is, never letting go
In a monastery inside Soho
There's a paintbrush
In a painted hand
And she's caring for me
Cause she cares for her man
Whoa
She's a poor crusader
On a distant ship
She's a miner for time
On a broken tip
She's a fiery deity
She's a pauper in this society
It can't phase her
It can't put her down
It can't phase her
It can't put her down
She's looking out the window
Catching the full moonbeams
She's looking out the window
Checking out what she can see, yeah
Cause there she is, never letting go
In a monastery inside Soho
There's a paintbrush
In a painted hand
And she's caring for me
Cause she cares for her man