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.
If you file for an extension, your tax return will be due six months after the April tax deadline. The tax deadline for extended returns this year is October 15, 2015.You can file Form 4868 to get an automatic extension. However, you still have to pay the tax due by the original tax deadline on April 15.hether or not you meet the tax deadline is based on the postmark on your taxes. You must have your taxes postmarked by the deadline, but the IRS doesnât need to receive your taxes by the 2015 tax deadline.