TEST SPECIMENS BACKGROUND NASA IS CONTINUING ITS WORK TO DEVELOP LIFING MODELS FOR NICKEL BASED DISK ALLOYS. IN ORDER TO ASSESS THE FATIGUE DEBIT DUE TO THE BROACHING MACHINING PROCESS, NASA WILL CONDUCT A SERIES OF LOW CYCLE FATIGUE (LCF) TESTS USING A DOVETAIL FEATURE SPECIMEN. THIS SOW SUMMARIZES THE REQUIREMENTS FOR CONDUCTING THE FEATURED LCF TESTS. SPECIFICATIONS THE LSHR ALLOY TO BE TESTED IS A NICKEL BASED P/M SUPERALLOY SIMILAR TO ME3. THE FEATURE TESTING WILL DONE IN LOAD CONTROL USING SERVO HYDRAULIC CLOSED LOOP TEST MACHINES. THE CONCEPTUAL DRAWING OF THE SPECIMEN IS SHOWN IN FIG 1. IT IS ANTICIPATED THAT THE SPECIMENS WILL BE 4.5 TO 6.0 LONG, 1.5 WIDE AND 0.25 THICK WITH A 0.25 WIDE REDUCED SECTION. NASA ANTICIPATES THE NEED TO TEST 150 SPECIMENS OF THIS GEOMETRY. NASA WILL SUPPLY THE TESTING VENDOR ALL THE SPECIMENS FULLY MACHINED. THE REQUIRED MAXIMUM TEST LOADS WILL BE BELOW 10 KIP, THUS ALLOWING 20 KIP FRAMES TO BE USED FOR THE TEST PROGRAM. THE TEST TEMPERATURE WILL BE 1000 F TO 1100 F. SPECIMENS SHOULD BE GRIPPED USING HYDRAULIC WEDGE GRIP SETUP. THE TESTS WILL BE PERFORMED AT A 0.333 HZ FREQUENCY FOR THE FIRST 24 HRS FOLLOWED BY 10 HZ AFTER THE FIRST 24 HRS. THE TEST QUOTES SHOULD BE PROVIDED IN TEST DURATION-DEPENDENT FORMS, SO THAT THE COSTS OF 10, 24, 36, AND 72 HOUR TESTS CAN BE COMPUTED BY NASA IN EACH CASE. INITIAL SET UP FEE SHALL BE INCLUDED IN THE QUOTE. SHIPPING COSTS SHALL ALSO BE INCLUDED IN THE QUOTE. THE QUOTE SHOULD INCLUDE ADDITIONAL COSTS FOR CALIBRATIONS AND ENGINEERING DESIGN REQUIRED TO OBTAIN UNIFORM AND REPEATABLE TEMPERATURE CONTROL IN THE NOTCH REGION AS WELL AS ADEQUATE GRIPPING TO AVOID SPECIMEN SLIPPAGE. THE QUOTATION WILL DESCRIBE THE PROPOSED HEATING SYSTEM REQUIRED TO OBTAIN 10 F TEMPERATURE CONTROL WITHIN THE NOTCHED GAGE SECTION. AFTER FAILURE EACH SPECIMEN SHALL BE SEPARATELY PACKAGED ACCORDING TO SPECIMEN IDENTIFICATION NUMBER AND SHIPPED TO NASA GLENN RESEARCH CENTER, 21000 BROOKPARK RD., CLEVELAND, OH 44135 (ATTN. JACK TELESMAN M.S. 49-7) WITH ALL THE ACCOMPANYING TEST RECORDS. FIGURE 1. FEATURE LCF SPECIMEN. THE THICKNESS OF EACH SPECIMEN WILL BE APPROXIMATELY 0.25 SINCE THE BROACHED BLANK WILL BE EDM ED INTO THREE SECTIONS. CONTACT FOR FURTHER INFORMATION: JACK TELESMAN PHONE (216)433-3310 FAX (216)433-8300