Izithasiselo zikakhonkolo ezingasindi | Ama-ejenti Akhipha Amagwebu Asebenza Kakhulu Wokhonkolo Weselula
Abstract
i-anticrack iwuhlobo lokwehluleka komthambeka obonakala ngokusulwa nokusakazwa kwe-shear-loaded, ukuphuka kwemodi exubile ehlukanisa isendlalelo esibuthakathaka endaweni ebanzi. Igagasi lokugoqa elingaqondile eliwumphumela lingaqhuba ubungozi be-avalanche kanye nokucupha. Kulesi sihloko sibala isimo sokucindezeleka kokuphazamiseka okukhiqizwa into elula, imodeli i-anticrack. Sibonisa ukuthi ikhiqiza i-shear wave nge-amplitude encike emandleni engqimba ebuthakathaka futhi ingahunyushwa ngokuya nge-Griffith stress concentrator.. Lokhu kugxila kokucindezeleka kukhiqiza ama-en-echelon fractures, okufana nalokhu okubonwa ensimini. Sibonisa ukuthi lezi fractures ze-en-echelon zifaka isandla ekuguqulweni okukhulu kwegagasi lokuwa kanye nokwanda okubangelwa amandla e-avalanche kinetic..
Kumamodeli lapho i-brittle fracture icatshangwa, i-crack ibonakala ngepharamitha yosayizi owodwa, irediyasi noma ubude obuyingxenye yoqhekeko, kanye nesici esiyingqayizivele samandla emishini, ebizwa ngokuthi i-crack energy V(r). Ngaphezu kokucindezeleka okusetshenziselwa ukuqhuma, la mandla nawo ancike ekubumbaneni, ijiyomethri, i-strain esetshenzisiwe kanye nanoma yikuphi ukukhubazeka kwempahla (isib. izimbotshana).
Encazelweni eqhubekayo yenkambu yokucindezeleka kungqimba olubuthakathaka amandla omshini we- i-anticrack ingahlukaniswa ibe umnikelo ngokulingana no-t2 kanye nengxenye ehambisana no-s2. Sisebenzisa ikhodi ye-BEM enezinhlangothi ezimbili ukuze sibale isimo sokucindezeleka esibangelwa imodeli i-anticrack CB, futhi uyiqhathanise nezingcindezi ezijwayelekile ezitholakala ngendlela ye-Eshelby. Eduze kwe i-anticrack ithiphu i i-anticrack Isixazululo siseduze kakhulu nesixazululo se-Eshelby, kodwa kunoma yiliphi ibanga elingaphezu kwaleli phuzu ukungafani kwehle kube ngaphansi 1%.