Pipe theha hlobolisa ke sa leka-lekaneng 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 ka ntle 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 ea tšepe, tšepe lakane rolang leloala lokiselitsoe ho hlahisa deformation longitudinal, dikai itseng tshebetso le mefuta e fapaneng ya diphapano boenjiniere ke e tsoelang pele tšepe deformation tshebetso ho kenngwa tshebetsong ka mekhahlelo, ho tloha leloala e 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 etsa 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 habeli, "w" mokhoa oa ho bōpa.Lipalesa tse holofetseng li ka khutlisetsoa morao, 'me li na le karolo e kholo ea elliptical cross-section e ka nqane.