Construction Gun barrel

-


the barrel of 240 mm howitzer in use in 1944.


a gun barrel must able hold in expanding gas produced propellants ensure optimum muzzle velocity attained projectile being pushed out. if barrel material cannot cope pressure within bore, barrel might suffer catastrophic failure , explode, not destroy gun present life-threatening danger people nearby. modern small arms barrels made of carbon steel or stainless steel materials known , tested withstand pressures involved. artillery pieces made various techniques providing reliably sufficient strength.




fluting


a german army g22 fluted barrel.


in firearms terminology, fluting refers removal of material cylindrical surface, creating rounded grooves, purpose of reducing weight. done exterior surface of rifle barrel, though may applied cylinder of revolver or bolt of bolt-action rifle. flutings on rifle barrels , revolver cylinders straight, though helical flutings can seen on rifle bolts , rifle barrels.


while main purpose of fluting reduce weight , improve portability, when adequately done can retain structural strength , rigidity , increase overall specific strength. fluting increase surface-to-volume ratio , make barrel more efficient cool after firing, though reduced material mass means barrel heat during firing.








Comments

Post a Comment

Popular posts from this blog

File format Wavefront .obj file

-
1 file format 1.1 geometric vertex 1.2 parameter space vertices 1.3 face elements 1.3.1 vertex indices 1.3.2 vertex texture coordinate indices 1.3.3 vertex normal indices 1.3.4 vertex normal indices without texture coordinate indices 1.4 other geometry formats 1.5 referencing materials 1.6 relative , absolute indices file format lines beginning hash character (#) comments. # comment an obj file may contain vertex data, free-form curve/surface attributes, elements, free-form curve/surface body statements, connectivity between free-form surfaces, grouping , display/render attribute information. common elements geometric vertices, texture coordinates, vertex normals , polygonal faces: # list of geometric vertices, (x,y,z[,w]) coordinates, w optional , defaults 1.0. v 0.123 0.234 0.345 1.0 v ... ... # list of texture coordinates, in (u, v [,w]) coordinates, these vary between 0 , 1, w optional , defaults 0. vt 0.500 1 [0] vt ... ... # list of vertex normals in (x,y,z) for...
Read more

CEFR alignment Euroexam International

-
table 1 - euroexam cefr equivalence euroexam provides tests of communicative english language proficiency @ 5 of 6 levels of cefr, practical tool language professionals evaluate different linguistic competencies of ‘can do’ descriptors. euroexams written, marked, , results calibrated based on cefr levels. means euroexam c1 level pass equivalent other exam board’s c1 level pass, example ielts 6.5 no element less 5.5., or cambridge english language assessment s 180 or cae grade c. (see table 1) euroexams has been directly involved in number of cefr development projects, last of in 2016. euroexam employs combination of internal , independent research support claim of equivalence cefr , other major exams.
Read more

Books Soma Valliappan

-
1 books 1.1 hr, investment , management 1.2 columns 1.3 creative writing books hr, investment , management valliyappan’s first book, thittamiduvom vetriperuvom, dealt self-development, published in year 2002. first book did in market , continued authoring books such thottathellam ponnaagum, kaalam ungal kaladiyil etc. introduced many specialized subjects in management tamil readers. valliyappan’s alla alla panam, published in august 2004 kizhakku publishers (new horizon media), created new record of sorts in tamil publishing world. book sold ten thousand copies in first few months of launch, unheard of investment book in tamil. in 2010, book’s sale crossed 1 lakh mark. following phenomenal success of alla alla panam, (aap) introduced basics of stock market, went ahead , wrote 4 more books on different aspects of stock market , investment technical & fundamental analysis (aap-2), futures , options( aap-3), portfolio management (aap-4) , trading (aap-5). soon, valliyappan became name...
Read more