1 Yield strength is the lowest stress that produces a permanent deformation in a material. 2  In some materials, like aluminium alloys, the point of yielding is difficult to identify, thus it is usually defined as the stress required to cause 0.2% plastic strain. 3  This is called a 0.2% proof stress.
This year's deadline to file your personal income tax return is midnight on May 5 â five days later than the usual Apr. 30 cutoff. You can thank that nasty Heartbleed computer bug for the extension, after it forced the Canada Revenue Agency to shut down its E-File system earlier in April.his year's deadline to file your personal income tax return is midnight on May 5 â five days later than the usual Apr. 30 cutoff. You can thank that nasty Heartbleed computer bug for the extension, after it forced the Canada Revenue Agency to shut down its E-File system earlier in April.
In a typical year, April 15 would be the red-letter day for taxes. This year, however, April 15 has been pushed aside by April 18. April 18 is this year's deadline to file taxes or apply for an extension. Usually, when April 15 falls on a weekend the tax deadline is moved to the following Monday. April 15 falls on a Friday this year but another event, Emancipation Day, is pushing back the deadline three more days.