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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Using Quick Load for Optimum Barrel Timing and OCW Node Matches
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<blockquote data-quote="Veteran" data-source="post: 3005450" data-attributes="member: 118038"><p>The only way I know to model both the change in bore size due to pressure and sound waves, and the bending moments due to harmonics</p><p>all at the same time would be via Haral's Finite Element Analysis, with a Lawrence Livermore Lab model which cell by cell, and time step by time step models every infinitely small segment of the barrel as all of these forces are exerted on it.</p><p></p><p>So, using solely Chris Long's work doesnt get you the whole answer but it can start you in the right direction and get you close. As I said, in threads above, its not definitive but saves you time and components in your load development.</p><p></p><p>Not many of us nor none of us has an FEA model to do the comprehensive job which will be more definitive. </p><p></p><p>I do believe the shorter and fatter the bbl., the more accurate and definitive answer you will get using just the Chris Long method, where bending moments and harmonics are not as severe, and the main issues may be just pressure and sound wave bbl. expansion and contraction.</p><p></p><p>On the other hand, thin skinny longer length bbls. have to have the complete FEA analysis due to much more pronounced bending moments or bbl. whip ie harmonics.</p><p></p><p>So, Chris Long method may not work very well the longer and skinnier the barrel.</p><p></p><p>But, the barrel expansion/contraction due to pressure and sonic waves is a frequency harmonics or cyclical modulation as well. Its just different than the bending moment </p><p>harmonics that also result.</p></blockquote><p></p>
[QUOTE="Veteran, post: 3005450, member: 118038"] The only way I know to model both the change in bore size due to pressure and sound waves, and the bending moments due to harmonics all at the same time would be via Haral's Finite Element Analysis, with a Lawrence Livermore Lab model which cell by cell, and time step by time step models every infinitely small segment of the barrel as all of these forces are exerted on it. So, using solely Chris Long's work doesnt get you the whole answer but it can start you in the right direction and get you close. As I said, in threads above, its not definitive but saves you time and components in your load development. Not many of us nor none of us has an FEA model to do the comprehensive job which will be more definitive. I do believe the shorter and fatter the bbl., the more accurate and definitive answer you will get using just the Chris Long method, where bending moments and harmonics are not as severe, and the main issues may be just pressure and sound wave bbl. expansion and contraction. On the other hand, thin skinny longer length bbls. have to have the complete FEA analysis due to much more pronounced bending moments or bbl. whip ie harmonics. So, Chris Long method may not work very well the longer and skinnier the barrel. But, the barrel expansion/contraction due to pressure and sonic waves is a frequency harmonics or cyclical modulation as well. Its just different than the bending moment harmonics that also result. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Using Quick Load for Optimum Barrel Timing and OCW Node Matches
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