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.
April 15 is a date burned into our brains: the drop-dead deadline to file our taxes or at least pay what we figure we owe for last year even if we get an extension to finish the paperwork later. But in 2017, the official tax day is actually three days later, April 18. Hereâs why: April 15 is a Saturday. The tax deadline is always postponed when it falls on a weekend or legal holiday. April 16 is also on the weekend, so itâs clearly not taking on the mantle of Tax Day.