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Bolt-bearing strength of wood and modified wood : Bearing strength of commercial cross-banded compreg under aircraft bolts

Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory
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130I.T-13EARING STRINGTI Of WOOD AND MODIFIED WOO D BEARING STRENGTJ-I OF COMMERCIAL CROSS-[SANDED COMPREG UNDER AIRCRAFT DOLTS INFORMATION REVIEWE D AND REAFFIRMED 1962 No. 1523-13 1 1,1'd 111 1 I 1 11111 1.111'1111111IIHIII I I I I I, III ~!lu'u~, l FOREST PRODUCTS LABORATOR Y MADISON 5 . WISCONSIN UNITED STATES DEPARTMENT OF AGRICULTUR E FOREST SERVIC E Cooperation with the University of Wisconsi nn BOLT-BEARING STRENGTH OF WOOD AND MODIFIED WOOD Bearing Strength of Commercial Cross-Bande d Compreg Under Aircraft Bolts-, 2 By P . J . HUNT, Enginee r H . R . GOODELL, Engineer and R . S . PHILLIPS, Enginee r Forest Products Laboratory, -3 Forest Servic e U . S . Department of Agricultur e Summary This report presents the results of approximately 1,800 bearing tests o n single-bolt specimens of commercial cross-banded compreg under steel air - craft bolts . In this investigation, the bearing strength and the critical dimensions (mini - mum edge clearances and end margins required to develop the full bearin g strength) were determined for compregs from three manufacturers (desig - -This is one of a series of progress reports prepared by the Forest Product s Laboratory relating to the use of wood in aircraft . Results here reporte d are preliminary and may be revised as additional data become available . Report originally published February 1946 . Z This is one of a series of reports dealing with bolt-bearing strength of woo d and modified wood . Other reports are No . 1523, "Effects of Different Methods of Drilling Bolt Holes in Wood and Plywood ;" and No . 1523-A , "Bolt-Bearing Strength of Laboratory-Made Cross-Banded Yellow Birch Compreg Under Aircraft Bolts ." Other reports will be issued as dat a becomes available . -Maintained at Madison, Wis ., in cooperation with the University of Wiscon- sin . Report No . 1523-B -1- nated in this report as A, B, and C), three grain orientations (0°, 45°, an d 90°), three thick

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