# Tag Info

Accepted

### Creep of the materials

Yes, creep occurs at all temperatures, although the dropoff is exponential. The reason is that at any nonzero temperature (which is all temperatures), there’s a nonzero chance for a thermal defect ...
• 1,610

### Why is stress the same even if I change the material?

Oh for goodness sake, this is statics 101. The stress in a beam in bending in the linear range is M/I=sigma/y There are no material properties in that equation.
• 727

### Impact of generator start-up on its health

Startup wear in internal combustion engines happens mostly because the engine is turning before the oil pump has had a chance to develop full pressure and move oil to all the moving parts of the ...
• 14.8k
Accepted

### Calculating stress tensor from the principle stresses

Given a set of principal stresses, it is not possible to get a unique state of stress. This is because the stress tensor has 6 independent components, whereas there are only 3 principal stresses. ...
• 146
1 vote
Accepted

### Why is stress the same even if I change the material?

In linear elasticity with small deformations (which is default for many FEA software), the stress might not depend on material, if you use only one material in the analysis and stresses come from ...
• 1,170
1 vote
Accepted

### Thin wall pressure vessels: local stresses in bends

Junction between cylindrical and conical shell Simple conservative solution You can use longitudinal membrane forces and put them into equilibrium in vertical direction. Cylindrical shell has the ...
• 1,170
1 vote
Accepted

### In a thin-walled cylinder, what exactly is Hoop Stress vs Radial Stress?

In a thin walled vessel it is simple. A cylinder uses coordinates $(r, \theta, z)$. Hoop forces mean azimuthal forces (in the $\theta$ direction) that attempt to increase the circumference of the ...
• 781
1 vote
Accepted

### Residual Stress Induced By Shot Peening

Stress component in $Z$ direction $\sigma_z$ must be in equilibrium with normal pressure at the surface. If there is no pressure, $\sigma_z$ is zero (it can still be nonzero below the surface). ...
• 1,170

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