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.
Residents must file state taxes using Form 1 each year by April 15. When that date falls on a weekend or holiday, filers get until the next business day to submit their state returns. This year, the IRS deadline for paying 2014 taxes falls on Wednesday, April 15, 2015.esidents must file state taxes using Form 1 each year by April 15. When that date falls on a weekend or holiday, filers get until the next business day to submit their state returns. This year, the IRS deadline for paying 2014 taxes falls on Wednesday, April 15, 2015.