Lokacin da bututun ƙarfe maras sumul aka zana sanyi, zafi birgima bututu lahani kamar fasa ko gaban high-madaidaicin zane mai tankin man da aka yi bayan karaya ya faru a cikin hanya, kusan babu roba nakasawa faruwa, gaba daya m karaya.Karaya yana faruwa ne saboda dalilai iri-iri.Irin su: iyakar hatsi tana hazo, ba tare da la'akari da wanda ya fi ƙarfin matrix ko rauni ba, duk suna haifar da fashewa;rarrabuwar kawuna a kan iyakokin hatsi an haɗa shi da dalilai karya;Bugu da ƙari kuma, ko da ƙasa da ƙayyadaddun ƙimar giciye a ƙarƙashin nauyin nauyi, na iya haifar da karayar gajiya.

Gabaɗaya, kayan aikin injiniya na kayan aikin hydraulic (pneumatic) da aka yi amfani da su a cikin ƙirar, ana ɗaukar kayan sun zama kamanni, ci gaba, isotropic, bisa ga wannan hanyar bincike ana ɗaukar ƙira mai aminci, wani lokacin hatsarori zasu faru.Binciken ya gano cewa tsarin raunin raunin danniya yana faruwa a cikin kayan ƙarfe mai ƙarfi, ƙungiyar kayan ta yi nisa da kamanni, isotropic.Ƙungiyoyi suna da fashe, za a sami haɗaka, porosity da sauran lahani waɗanda za a iya gani a matsayin microcracks na abu.Bugu da kari, karyewar karaya da kuma memba na yanayin zafi mai dacewa.Lokacin da mutane ta hanyar bincike sun gano cewa lokacin da zafin jiki ya faɗi ƙasa da wani zafin jiki, za a canza kayan zuwa wani yanayi mara ƙarfi, tasirin tasirin makamashi ya ragu, al'amarin da aka sani da fashewar sanyi, don haka ƙirar amma kuma bisa ga memba na zafin aiki zaɓi zaɓi. tare da dace sanyi-raguwa zazzabi canji na kayan.