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Show Page HILL TOP TIMES 8 June s ifA i HB r IN WEAPONS SYSTEMS Stress Analysis Helps Assure Reliability in fil delicate tool called a strain gages used to determine strain levels of weapon system components under load, is of vital importance in finding causes for weapon failure and evaluating: design integrity of new items. A r 1 flintr Unlet LET US BE YOUR VALET ONE-HOU- R DRY CLEANING EXECUTIVE SHIRT SERVICE DRAPERY SPECIALISTS Exclusive "ADJUSTA DRAPE" Fold Finishing Process OGDEN 2898 WASHINGTON BLVD. pounds per square inch ; lets notorious for their nign physicist, J. N. MacDonald, in the Metallurgical and Nondestructive Test Section, Maintenance Quality Engineering Branch, find3 strain gage techniques both challenging and exacting. "It's one of the most reliable tools of the trade," said Mr. MacDonald. "We find that gages are adaptable to any problem and can be applied to almost any material." Upon retirement from the A many others. The total thickness of a gage is governed by its mission, 11,000 inch being a good average. Strain gages work on the principle that under a given voltage, a wire will carry more or less current, according to whether it is contracted or stretched. The gage is 'bonded to the test piece at a location chosen because of the stress characteristic, and wired into an electronic bridge to measure the deformations of the piece being tested. Army, Mr. MacDonald obtained a degree in physics and joined the Hill AFB workforce in 1962. His outside interests involve experiments with electromechanical gadgets, and he is currently interested in home Stretch or Shrink environmental conditioning, using the germicidal range of ultra-viol- et radiation. ROY SHOPPING CENTER Sensing Device The strain gage, which may be only l64th inch square, is used as the sensing device in many projects to find out the BOUNTIFUL are subjected to. Some previous called for gages inside cylinders pressurized to missions have to be applied to be later thousands of HI 1501 SO. MAIN ST. Loads applied to the piece cause its material to stretch or shrink, as the case may be. The strain gage follows this change and its resistance varies accordingly, showing up immediately as a deflection in the reading on the indicator. Strains as little as one millionth of an inch per inch are easi'y measurable. A test may use one strain gage or hundreds, and the pro- - to strain levels that components ROY and under stress; J. N. EXACTING WORK MacDonald, a stress analyst In thje Metallurgical and Nondestructive Test Section, Maintenance, is soldering the leads to the delicate strain gaee which is bonded to an aircraft bolt. The bolt will be screwed into a fixture, and the strain of the bolt will be measured by the gage. cess of strain gaging is a meticulous one. Therefore, patience is the prime ingredient in this art. Mr. MacDonald it is says very rewarding when investigation results in a successful "fix" of the part, or design integrity can be improved. Mr. MacDonald's are tools many and varied. Besides the strain gages, there is a testing machine capable 12-fo- ot of of exerting pounds either tension or compression used for destructive testing of large metal specimens. Fatigue Tester Another important machine is the fatigue tester, which can apply repeating loads up to 50.000 pounds at 1,800 times a minute in a cycling or sine-wav- e mode used to gain insight 30,000 SAVE NOW ON EXTRA LOW PRICE! LIMITED STOCK, SO COME IN EARLY! the life into materials. expectancy of A hydrogen embrittiement tester is used to find the extent of embritUement caused by hydrogen locked into a metal part during chromium or ca- dmium plating. Every piece of Air Force hardware has a mountain of engineering design behind it before it ever becomes a field item. Since no accurate prediction can be made of all the conditions that a component may experience, when failure occurs, it is often the responsibility of the stress analyst to find out "why." Through use of stress analysis, substantial savings are gained by increasing service life and reliability of components used by the Air Force, 1 TERnr SMILE Cotonvin OASIS Model 64 70--? 30 Coleman Oasis $(o)(cT)95 IRS NeWSCope 14 y No. 720 South Salt Lake News Law v0lc8 Hill Top Times The Hub BIG 9x12 SIZE South , Magazines Main Kaysville. Utah 84037 376-551- 8 Coleman Family Tent 8(10 59 Coiaman FAMHV Moo 95 TENT MMA-7W- J t rjT ?rr .t nr ! 70 mg COttMAM fttHOU MtNTU T? m& LANTERN Coleman Umbrella Rtg. ms p.m. all day Mamorlat Day HIT TMI s Friday, May 29th till Opn luggage in the front and your worries behind you. Put your WITH THIS COUPON Opt TheVWSquareback.trunk I t'OITMAAXl MMDIM. O 3995 ROY STRONG & TOWt WAT TO WRLMO MOTORS I AT, At TMI WtllAIQ AT TWtM Oft, 3333 Wall Av. fhor 3935811 muuuuuuuuuuuuuuuuul tJULOJUUJLIJUUUUULtJ k |