ENGN UMR0054 I 1 Kn, __ 225O-1-P I ~.o o ITHE UNIVERSIlTy OF MICH'C__-____ —_ 50-1-P ENGINEERING IBRARY. 9 UNIVERSITY % MICHIGAN PROGRESS REPORT NO. 1 Research and Development on Methods for Structural Testing of High-Speed Aircraft and Missiles 1 April 1954 to 1 August 1954 H. F. ALLEN 4N O F4 fij July, 1954 Department of the Air Force Wright Air Development Center WPAFB, Ohio Contract No. AF33 (616) -2437 ENGINEERING RESEARCH INSTITUTE A N N ARBOR

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ENGINEERING RESEARCH INSTITUTE UNIVERSITY OF MICHIGAN ANN ARBOR PROGRESS REPORT NO, 1 RESEARCH AND DEVELOPMENT ON METHODS FOR STRUCTURAL TESTING OF HIGH-SPEED ATRCRAFT AND MISSILES 1 April 1994 to.l August 19554 H. F. ALLEN Project 2250 DEPARTMEINT OF TEE AIR FORCE WRIGHT AIR DEVELOPMENT CENTER WPAFB, OHIO CONTRACT NO. AF35(616)-2457 July, 1954

ENGINEERING RESEARCH INSTITUTE * UNIVERSITY OF MICHIGAN PROGRESS REPOET NO. 1 RESEARCH AND DEVELOPMENT ON NETHODS FOR STRUCTURAL TESTING OF HIGH-SPEED AIRCRAFT AND MISSILES PURPOSE This prject covers theoretical analyses and laboratory tests to establish relationhips which may exist between room-temperature tests and iariou typs of elevated-temperature tests of aircraft structures, and to develop means of producing rapid temperature changes in aircraft struetural components. STATUS In accordance with Reference 1, this report covers a period of four months instead of two months. A starting date of 1 April 1954 is specified in the contract, but due to contract'ural delays the project was not established until 24 May 1954 The necessary rescheduling of other duties eould not be done in ad.ance and delayed the actual start of work on the project until approximately 1 June 1954, Progress since that date has been slow due to vacation schedules and inability to -ttain student assistance during the summer months, A box beam as been desied and fabricated which may serve as the prototype for the test specimens to be utilized in Phase I, and a room temperature test jig is being designed. ______1_________________ 1 ________________________

ENGINEERING RESEARCH INSTITUTE * UNIVERSITY OF MICHIGAN WORK ACCOMPLISHED During the period covered by this report, studies were initiated which are expected. to lead to the selection of the type of structure and the size of the test spetimen to be used in the Phase I investigations The structure should not be large, in order to minimize costs,, and preferably should fail by'buckling of skin and stringers, The design must be sufficiently simple s t1at it will not be diffieult to construct a fairly large number of specimens which will be substantially identical, geometrically, and which will be fabricated from the Same batch of material.| A reetangular box beam will be tried first, as such a cross seetion is easily duplicated to close tolerances. A 4i-inch by 11-inch aluminum-alloy box bem has. been designed and constructed of material on hand. A roomtemperature test setup i's being designed to subject this specimen to bending tests at rom temperature. A similar beam will then be constructed and subsequently tested at elevated temperature. A conference with the project engineer at Wright Air Development Center will be scheduled before adopting a type of s peimen for the entire test program of Phase I. REFERENCE Wright Air Development Center letter WCLSS(WCLSS-6) dated 22 July 1954 to the Engineering Resea.rch Institute, University of Michigan,.,gn.e, 9,2eex h~a

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