| OCR Text |
Show 29 To qualitative results form the Figure 17 sequenco quite general:;l for Pp that the role of brass P2 respectively brass plate and the remains P2 plate change, same as shown 17 Note the and PI (d) and 17 (a) (PlV)t2 Figure 17. in the designations of but between Figures reverses and (PlV)i (PlV\l shock impedances be the let the discussion keep • -- Figure. 17 shows that the first shock reflected from interface (1) a intensity. - Similarly:. first reflected the would be all and pulse pressure release are if the p Lexf.g l.as would be wave and positive . following wave dimintshing intensit.y. f and follows that for the interfaces edges of all the of the (1) An obvious l.Lary cor a shock. pressure the duced until to form a sandwiched-material the e.qual are wave As sure profile at are let or at leadini equal the to shack while the is layer waves the. be the re merge. moving un,itye incident in of the pres Figure 18 diagrams the results The bracketed numbers represent leading edges the. Lg Lna l or they will r+Lap, let the height of and (1) interface ove of all the ... heights of it and cancel. 2 = n waves initial the to 17 numerically. of Figure (2) transmitted train of example, an leadi.ng edges of the the thi.ckness .of the. sandwiched Now if similar sum interface at oppos f.t.e direction merge the quant.Lt.y, the of is of that n(P1V) shock within the sum (P1V) negative of that reflected shock. the t.o The is transmit.ted waves of attenuation no waves the pressure profiles following the first shock reflected from interface shock of case enusing any pos Lt.Lve finite to equal n all general if the impedance of the initial and final materials and the sandwiched layer with of diminishing sandwf.ched between brass, were. tension a waves is profile pressure and the relative\ arrows designate the. direc tion of travel. S2 .= The transmi t tied pressures 3/4 + 3/16 t 3/64 + 0 ••••• form 0 0 a geometric progression of which is a rapidly converging Now S2 _ - 6-rm)_ (1- 00) - a\l-r 3./4 sum (1/4) 1-(1/4) -= 1 s er d.e s . |
