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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Product Number as a Function of <br />Coefficient of Friction <br /> <br />10 <br /> <br /> - B~se PN <br /> .... mu:0.3 <br />........................................... .,......................................... .......................................... - mu:0.7 <br />/' <br />.. :L..... ............. <br />.-.... ._- ..._-_...__.~~ <br />...................!.............-....... ............................................ ~............._.......... <br />...~~.~ .. ."... .- .. ._--~- <br /> <br />P <br />r <br />o <br />d <br />u 5 <br />c <br />t <br /> <br />., <br /> <br />o <br />o <br /> <br />2 <br />Depth <br /> <br />Figure 13 <br />The coefficient of static friction (m) was varied to test the sensitivity of various surfaces (Figure <br />13). This resulted in variations to the curve in the area where slippage controls, as expected. It also <br />varied the range in which slippage controls, which is still in the vicinity of one foot of depth and <br />lower. A median of 0.5, used in the base configuration in the preceding analysis, was adopted for <br />purposes of comparing the effects of body geometry. <br /> <br />3 <br /> <br />4 <br /> <br />10 <br /> <br />Product Number as a Function of <br />Factor of Safety <br /> <br />- B~se PN <br /> <br />P <br />r <br />o <br />d <br />u 5 <br />c <br />t <br /> <br />... 5f: 1.0 <br /> <br />"... .........., <br />.._.~~.__.;;.ll~w.. .--~8.Il.lttlo-~""""""'" ._ <br />,. '... <br />.' ....... <br /> <br />.. - 5f:2.0 <br /> <br />. ./ --- <br />:...............~................ <br /> <br />......... <br />... <br />..........mm.......................... ~ ........~ .~~~~......................m.m".. <br />" <br />'" <br />.. '.. <br />~'..-- <br />'" <br /> <br />., <br /> <br />o <br />o <br /> <br />2 <br />Depth <br /> <br />3 <br /> <br />4 <br /> <br />Figure 14 <br /> <br />While uncertainty is a significant factor in a study of this nature, a reasonable factor of safety <br />(Sf)was assumed to be 1.5 for the purposes of this analysis. This value was varied from 1.0 <br />representing no factor of safety, to 2.0 which represents a doubling of the force of the flow due to <br />velocity (Figure 14). <br /> <br />-12- <br />