G - Physics – 01 – M
Patent
G - Physics
01
M
G01M 15/00 (2006.01) G01M 99/00 (2011.01) G01N 3/60 (2006.01)
Patent
CA 2254534
A method of providing accelerated thermal fatigue testing of an engine component, comprising: (i) impinging one or more torch flames directly on a selected area of the test specimen (i.e. metallic engine cylinder head) to heat such area to a critical test temperature that exceeds the normal maximum loading temperature of the specimen in normal use by about 10-25%, and holding such temperature for a period of .01-2.0 minutes; (ii) at the end of the holding period (i.e. Water jet water in head jacket, or air in ports) quenching the heated area of the test specimen to a temperature that is about 75% below that of the normal maximum loading temperature and holding such quenching temperature for about 1-3 minutes; and (iii) repeating steps (i) and (ii) until a crack is induced in the test specimen while recording the history of temperature and time involved in such repeated steps. An apparatus for accelerated thermal fatigue testing, comprising a system having: (a) a heating enclosure supporting a metallic cylinder head; (b) a plurality of torches extending into such enclosure for impinging flames on selected areas of the head, the torches carrying a combustible mixture of air and fuel in a ratio of about 10 to 1, that can provide a flame that heats the areas from room temperature to a temperature of at least 250°C in a period of less than 1 minute; (c) a plurality of quenching nozzles with at least one nozzle associated with each area for directing quenching fluid thereonto for a selected time interval; (d) controlled means for cycling the operation of the torches and nozzles, wherein a cycle can be repeated which cycle consists of quickly heating the selected areas of the head to said temperature and holding for a period of .01-2.0 minutes at the end of which time a nozzle administers quenching fluid that rapidly reduces the head temperature by at least 200°C for a period of 1-3 minutes. -12-
Akpan Edward
Branson Jeff Lee
Dinh Long T.
Loncke John
Piekos Richard
Ford Global Technologies Inc.
Sim & Mcburney
LandOfFree
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