PPT Slide
Where is the flow stress of the material.
- The great weakness of this criterion is that it predicts plastic
flow of a material under a hydrostatic state of stress; however, this is impossible, as shown by the example below.
- It is well known that tiny shrimp can live at very
great depths. The hydrostatic pressure due to water is equivalent to 1 atm (10-5 N/m-2) for every 10 m; at 1000 m below the surface the shrimp would be subjected to a hydrostatic stress of 10-7 N/m-2.