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MILITARY TEN CAP 230. , -f <br /> BLASTING MACHINE L 700_ C 220- ° <br /> p N <br /> . <br /> Arsnel 11111sr' Arsnel 1 ,a0 <br /> Rebuilt - <br /> Rebuilt 10°_ <br /> O.D. green, -•� Ex. cond. Inside, - <br /> excelient a' a°- o <br /> condition, 4 used cond. out- 9 °° 8 <br /> I - <br /> r side, 6 mos. ° • , ° <br /> Y 7 4 <br /> • ear 4.• warranty. <br /> 0 ° ,° <br /> warranty. �j 0' .00,nonmla4,KR •an <br /> $2900 $19900 Figure 8. Circumferential strain and surface <br /> vertical vibration <br /> f1 U 1 J pipeline separations. By contrast, the previous stud-Cal=1E0 ies involved close-in point sources. Interesting is <br /> 0 0 the apparent limiting effect of pipeline responses. <br /> Igniter Time 0 0 0 0 Circumferential strains, in particular, do not continue <br /> izt <br /> to increase in proportion to increasing surface part <br /> Blasting Fuse u.s. GI Blasting cle velocity: This could be from lack of total cou• <br /> weatherproof, M60, Cap Container piing with the ground. <br /> once fired 0ur°b1°plastic,O.D.groin, <br /> $795 hoJda 10 caps. Another possibility is that the spatially extended <br /> traabla gaol cond.- '4.95 charge with its relatively long detonation time <br /> `uubra•°:.°ala•'9.95 impacts the pipeline less than a point source type <br /> °. a�. blast. The hypothesis requires further analysis.• ROCK ISLAND ARMORY Stresses <br /> +✓ •e 2s144 Ridge Road,Dept EE, Stresses were calculated for each blast using max- <br /> : <br /> c pc. Colon,IL 61241 imum circumferential and longitudinal strains <br /> • • (309)441-6214 • Fax:(309)441.5758 g <br /> (tabic4). As with previous SwRI studies by Esparza, <br /> these were assumed to be principle plane strains, <br /> and represent a type of worst case(as in pseudo vec. <br /> T90 for stun compared to true vector sum). Esparza's val- <br /> 0 :00.- <br /> * , <br /> ues of Young's modulus (29.5 x 106) and Poisson's <br /> o ,Tn°"T - Ratio (0.3) were used (Ref 5). Stress values calculat- <br /> a x fo <br /> 4,04, r <br /> 4° ■ 10..46,0004T - ed from these tests are based on pseudo stuns of Ion- <br /> gitudinal and circumferential. An initial examination <br /> '° - of time-correlated strain components found that <br /> a°� peaks did not occur at the same time. Phase is also <br /> • °° • a e - important in calculating the stresses corresponding <br /> C• • <br /> °° • I . to given strain states. If the two component are <br /> ' 10 'a io opposite (one tensile and one comprehensive at any <br /> 0a,,no•c•ATp.4,• 0AL•• instant), the calculated stresses are actually less than <br /> Figure 6. Circumferential strain and surface would correspond to either uniaxial strain. <br /> radial vibration Circumferential of hoop stresses from internal <br /> , pressurization can be easily calculated from the <br /> thin-walled cylinder equation; <br /> .:0. <br /> T i l 700 <br /> + $ice"Ic <br /> r I , T <br /> 200- o ,-Ma, • • a•�S rvc <br /> a 17•NGI r 700- 0 LZ.b,�H NCW <br /> C 70•l+C1% • ¶24cn MD <br /> 130- o 70-t.cn <br /> I50 <br /> I 00. • <br /> 107■ - <br /> ° ° 1 a0. ° o - <br /> s S• q <br /> I <br /> r • , <br /> 0 a 10 is 70 °0 0 4 0 4 ¶0 <br /> Of101.240 VI°IJ/,T10.1.AADV4.0v4 cnoUND vtpqAMN,vtATlC L YH <br /> Figure 7. Longitudinal strain and radial Figure ). Lon gitudinal strain and su face <br /> vibration vertical vibration <br />