' i ' '':. * ' ' f *, WATERTOWN ARSENAL H LABORATORY n MEMORANDUM REPORT. NO. WAL 710/59b
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1 7/ffr? :utaj!b**b»^usaa6 g5aaaaje FVTPA r^nrsv n < Q < ' ' '':. * ' ' f *, AS*;-. WATERTOWN ARSENAL H LABORATORY n MEMORANDUM REPORT NO. WAL 70/59b CA / *5* r-essutf tu r'er'-l.tu by 4-Uv..u Fradaent-cdjulatxr^ rr.ecu.fc u-l-s l V'-x'^Uü j»>...beffa u Lasers ux' 7-/«. Qz«*Njn Duck >- O BY Jr. Ln fa nt;er Jr«*..«**' OMUSSrlD V. v J'.^b.hn <«.jn!j:ctr>d DATE A 7 wf. - VATERT0WK ARSENAL VATSKT0WN.MAlfe jq 2 9
2 >%\ 5 5 '-V V "V Vatertwr. Arsenal labratry Memrandum Reprt M. WAL 7X0/596 Frst Partal Reprt n Prblem &-8.U r."- -\ 7 March 9M Heelstance t Perfratn by h-.qran Fragment-Smulatng Prjectle tt-l-f f Varus Kumbers f Layer» f 7-/? Or. Nyln Duck: l".,.-.'.v. n respnse t a request frm the Offe, Chef f Ordnance, **' 'varus numbers f layers f 7-/? *. nyln duck have been teeted wth the ^-graln fragment-smulatng prjectle develped at ths arsenal ;^^~ - 2. n accrdance wth nstructns the ball?te unts f several ples f ths materel, es affxed t a dummy, were determned. n addtn smlar ples f ths materal munted rgdly n a weeden ballstc frame ' >" were tested wth the same prjectle. The results f each aere«f test«appear n Table X n cmpany wth the estmated ballstc lmts f gd g- Radfeld manganese steel f euvalent weght per sucre ft. jjtbese values P- hare als been pltted n Fgure. ^* > **^«^. Examnatn f ths fgure dsclses that at lwer lmt velctes! a rven ply f ths materal, munted lsely, s that t may react freely t mpact, ffers resstance superr t that f the same ply, munted rgdly, gp s that ts reactn t mpact s mpeded. A«lmt velcty ncrease*, t hwever, ths superrty decreases untl a 2-ply cmbnatn, lsely munted, >'.'; enjys n superrty ver a rgdly mum-ted cmbnatn f the same thckness. '- '. Ths dmnutn f superrty as velcty ncr»r.see s dubtlesa attrbutable t the fact that at lwer velcty the tme cnsumed n perfratn s such ma allws a lsely munted materal a measure f reactn befre cmplete perfr- *-' atn. whereas es v«l*ety ncreases and the tme expended n perfratn cm» &~ seuently decreases a leaser degree f reactn e*n take place prr t falure :'"-'. untl, at a crtcal velcty, the permtted reactn f the lsely munted '/,''. cmbnatn and that f the rgdly munted cmbnatn apparently «caltes and the resultant resstance f bth s vrtually dentcal. U. Prm Fgure t als appears that n thckness less than «but Ä r lj-ply a gven weght f the subject materal affrds resstance t perfratn ' '- VS by a Wreln fragaent-enulatln«? prjectle <M-S superr t that f an euv-; alent wefet f steel. n thcknesses greater than -ply, hwever, t s tue- -.. >;; pected that an eual wecht f steel wll prvde the greater resstance t ',-;.* '. attack wth ths type f prjectle. A current lade f prjectle«preclude«^' -"- a mre cmplete nvestgatn f ths prblem at ths tme. S () 0.0. */0* («.), wta# 42/^ (c). U> WAX?S2/2h 7 ( c ). % l> 'r r' -»-»-'- ' ' '.- *-:.' _-. -.^ '.... _. -.-V,...>. '."..,
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WATERTOWN ARSENAL LABORATORY MEMORANDUM REPORT NO. WAL 710/281. Resistance of "K Panels" Submitted "by. the U. S. Hufrber Oomoany to Perforation \j
'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;
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