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, 2015, is the last day to file your 2011 tax return to claim a refund; if you had an extension, your deadline is October 15, 2015. If you miss the deadline, any excess in the amount of tax you paid every paycheck or sent as quarterly estimated payments in 2011 goes to the U.S. Treasury instead of to you.orgotten tax withholdings. The IRS sets minimum gross income levels below which taxpayers do not have to file a return. For example, in 2011, taxpayers under age 65 who were single and made less than $9,500, or heads of household who earned less than $12,2000, had no obligation to file.