WATERTOWN ARSENAL LABORATORY MEMORANDUM REPORT NO. WAL 710/281. Resistance of "K Panels" Submitted "by. the U. S. Hufrber Oomoany to Perforation \j

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1 'i//j / /' u i D(TRA COPY HCL c/ CO CM < O < WATERTOWN ARSENAL LABORATORY MEMORANDUM REPORT NO. WAL 70/28 UJ Resistance f "K Panels" Submitted "by the U. S. Hufrber Omany t Perfratin \j rrg^ment-slmulatlnfi; Pr.lectlles This dcument has been apprved i i public release and tale; its di.tiibutin is unlimited. BY J. 7. SmiVAJT Agst. Engineer ^DTC ^ELECTE ^^OCT VATERTOWN ARSENAL DATE 3 Jciraary 9^5 ifivuvi mm

2 ..,,, THS DOCUMENT S BEST QUALTY AVALABLE. THE COPY FURNSHED TO DTC CONTANED A SGNFCANT NUMBER OF PAGES WHCH ' DO NOT REPRODUCE LEGBLY.

3 ^«Ä'^'' 777 ''' WAJPBRTOWT ARSSHiO. LABORATORT jwmamm aipaf NO. WAL 70/ggi ^irst Partial Heprt n Prblem B-g.ll 3 January 9^5 RealBt^nce f "K Panels" Sabmltted by the ü. S. Rabber Cmpany t Perfratin by Vagment-SlMalatlng Prjectiles 3 *AO. n respnee t a request frm the Office, Chief f Ordnance^ tests were cnducted at this arsenal n several samples f "K Panels" (laminate«f H-30-W aluminum ally with fiberglas) tsubinitted by the ü. S. Rubber Cmpany cllabrating with the Reynlds Metals Cmpany. c.,^ - 2. The resistance f these samples t perfratin by cal..45 steel-jacketed ball prjectiles and by the cal..22 fragment-simulating prjectile, Ö-S'^T'wa greatly inferir t that f Hadf"eld manganese steel f equivalent weight-per-unit area that tests with ther fragmentsimulatrs were nt cnducted. t was nticed that when the verall weight was kept cnstant but the weight f the aluminum cmpnent was increased the resistance f a sample decreased., w.^». 3. Samples were welched and measured and the weight-per-squareft and the equivalent steel gauge determined. Samples vere then rigidly clamped t wden ballistic frames and mpacted fairly with cal..u5 steel-jacketed ball prjectiles and with cal..22 fragment simulating prjectiles, 0-2, The results f these tests are ncluded n Table. h. The resistance f nne f these samples t perfratin by the test prjectiles used cmpared with that f an equivalent weight f Hadfield manganese steel. As might have been anticipated frm earlier tests f the cmpnenteparately (in which the fiberglas laminate exhibited high resistance and the aluminum ally exhibited lw resistance) samples f equal verall weight increased in resistance t perfratin as the weight f aluminum emplyed decreased U70./U76 - vftn 470./Y25U - 3 July 9^ 2. VAX. 762/253 ////// mmjmhm^ - - i V/jr;/^ '»

4 r umtnj- «' > '* 5. llthtigh the resistance f these samples t perfratia \>7 the prjectiles used shuld nt "be cnsidered a criterin f their resistance t actal service impact f fra/^nents f high^explsive shell, their behavir tinder inipact f these prjectiles indicated that the divisin f the fiherlas cmpnent int tw sandwiching elements effectually wastes the r.nnrin^ effect f the face elenent. The cnslidatin f these tw elements int a single element "behind the alnminum cmpnent wuld nnduhtedly result in a mre efficient perfratin resistr. J- zaiu- APPROVED: J. T. Sullivan Asst. Engineer B. L. Reed Research Metallurgist Actinis; Chief, Armr Sectin A.essln Fr : rs *GRA& 'C TAB ',,: ;-iunced ;,-i if icatiru- D3 r buti n/ A v.-. lab i ity Cde«jAvail and/ar : j j-.t ' Special h M ÜNCE0 C0NFD5NTAL - 2 -

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