Pipe theha hlobolisa ke e sa lekane curvature composite longitudinal deformation thulaganyou e le tshebetso e tsoelang pele karolong ea sefapano, 'me hlobolisa e kobehile ka matla a multi-directional deformation tshebetso.

Molao-motheo oa motheo oa ho otloloha ha tšepe ea seam pipe ho theha khopolo ke ka ketso ea matla a kantle ho hlahisa deformation ea polasetiki ea lesela la tšepe hore e be sebopeho se lakatsehang le li-tubes tsa boholo. Ho tloha ka tšepe phala ka tshebetso ya deformation ea bokaholimo holim'a e tsoelang pele rapameng le paatsepama, e tlamang sebelisoa ho eona ho hlophisoa ka likarolo tse peli ho kenya tshebetsong le ho feta ka leloala moqolo theha, moqolo feta ke ho etsa pharalla deformation tšepe, tšepe lakane rolang leloala lokiselitsoe ho hlahisa deformation longitudinal, dikai itseng tshebetso le diphapano tse fapa-fapaneng boenjiniere ke e tsoelang pele tšepe deformation tshebetso ho kenngwa tshebetsong ka methati, ho tloha leloala tšoanang (ho akarelletsa le moqolo groove le leloala tokisetso) ho finyella . Longitudinal deformation ka tsela e bilikang ea poleiti ho bolela ka cylindrical sebopeho deformation, tube cross-section transverse deformation bolela koba deformation.

Pipe theha tshebetso e ka bophara arotsoe ka mekhahlelo e meraro: a sa jese litheohelang profild karolo, e mahareng mohato oa phetoho le ho qeta ho theha sethaleng, ba na le ntho e tšoanang ke molao-motheo oa "ellipse selikalikoe", ho fella ka deformation ea mabaka a ho qeta tsamaiso ea ho feta e fapane haholo, haholo-holo maemong a mekhoa ea khale, ho na le mokhoa oa ho kobeha ka mathōko, mokhoa oa ho kobeha oa circumferential, bohareng le hamorao mokhoa oa ho kobeha o nkiloeng ho radius e le 'ngoe, radius e habeli, mokhoa oa ho bopa "w". Lipalesa tse holofetseng li ka khutlisetsoa morao, 'me li na le elliptical cross-section axis e kholo ka lehlakoreng le ka holimo.