石油化工高等学校学报
石油化工高等學校學報
석유화공고등학교학보
JOURNAL OF PETROCHEMICAL UNIVERSITIES
2013年
5期
67-70
,共4页
李金和%黄崇君%席仲君%刘国昊%刘勋
李金和%黃崇君%席仲君%劉國昊%劉勛
리금화%황숭군%석중군%류국호%류훈
气体钻井%钻柱%本构关系%损伤度%损伤演化%疲劳寿命
氣體鑽井%鑽柱%本構關繫%損傷度%損傷縯化%疲勞壽命
기체찬정%찬주%본구관계%손상도%손상연화%피로수명
Gas drilling%String%Constitutive relation%Damage degree%Damage evolution%Fatigue life
针对气体钻井钻柱频繁断裂失效问题,以现代损伤力学研究为基础,分析钻柱损伤演化过程,建立气体钻井钻柱损伤疲劳寿命预测模型。由钻柱损伤疲劳寿命模型得出损伤度是影响钻柱疲劳寿命的主要因素,引入损伤梯度并进一步通过算例研究钻柱所受轴向载荷、损伤度及应变之间的关系。根据理论与算例分析可得,随着轴向载荷增大,损伤度与应变逐步由空间周期关系转变为类周期关系,出现损伤局部化,导致钻柱的疲劳失效。
針對氣體鑽井鑽柱頻繁斷裂失效問題,以現代損傷力學研究為基礎,分析鑽柱損傷縯化過程,建立氣體鑽井鑽柱損傷疲勞壽命預測模型。由鑽柱損傷疲勞壽命模型得齣損傷度是影響鑽柱疲勞壽命的主要因素,引入損傷梯度併進一步通過算例研究鑽柱所受軸嚮載荷、損傷度及應變之間的關繫。根據理論與算例分析可得,隨著軸嚮載荷增大,損傷度與應變逐步由空間週期關繫轉變為類週期關繫,齣現損傷跼部化,導緻鑽柱的疲勞失效。
침대기체찬정찬주빈번단렬실효문제,이현대손상역학연구위기출,분석찬주손상연화과정,건립기체찬정찬주손상피로수명예측모형。유찬주손상피로수명모형득출손상도시영향찬주피로수명적주요인소,인입손상제도병진일보통과산례연구찬주소수축향재하、손상도급응변지간적관계。근거이론여산례분석가득,수착축향재하증대,손상도여응변축보유공간주기관계전변위류주기관계,출현손상국부화,도치찬주적피로실효。
Based on the modern damage mechanics research ,aiming at the gas drilling string frequent fracture failure ,the drill string damage evolution process was analyzed .The gas drilling damage fatigue life prediction model of the drill string was established .The gas drill string damage fatigue life model was the main factors influencing the fatigue life of drill string .And damage gradient was introduced to explore the relationship among axial load ,injury tolerance and strain .According to the theory and case analysis ,the relationship between injury tolerance and strain is going through a change from space period to quasi periodic with the axial load increasing .Meanwhile ,damage localization occurs that lead to drill string fatigue failure .