中国舰船研究
中國艦船研究
중국함선연구
CHINESE JOURNAL OF SHIP RESEARCH
2015年
4期
79-85
,共7页
船舶碰撞%失效准则%耐撞性试验%数值模拟
船舶踫撞%失效準則%耐撞性試驗%數值模擬
선박팽당%실효준칙%내당성시험%수치모의
ship collision%failure criteria%indentation test%numerical simulation
失效准则作为判定结构失效的依据，对船舶碰撞仿真分析的准确性有着重要影响。基于3种典型舷侧结构缩尺模型的准静态耐撞性试验，采用等效塑性应变准则、主应变—厚度应变准则以及RTCL（Rice-Tracey&Cockcroft-Latham）准则对模型试验进行数值模拟，比较各准则对裂纹产生的模拟效果，讨论3种准则计算的极限撞深和吸能值与试验的误差。研究结果表明，3种准则均能取得满足工程需要的仿真精度，但相对于等效塑性应变准则和主应变—厚度应变准则，引入应力三轴度的RTCL准则能更准确地模拟不同结构的裂纹产生过程。
失效準則作為判定結構失效的依據，對船舶踫撞倣真分析的準確性有著重要影響。基于3種典型舷側結構縮呎模型的準靜態耐撞性試驗，採用等效塑性應變準則、主應變—厚度應變準則以及RTCL（Rice-Tracey&Cockcroft-Latham）準則對模型試驗進行數值模擬，比較各準則對裂紋產生的模擬效果，討論3種準則計算的極限撞深和吸能值與試驗的誤差。研究結果錶明，3種準則均能取得滿足工程需要的倣真精度，但相對于等效塑性應變準則和主應變—厚度應變準則，引入應力三軸度的RTCL準則能更準確地模擬不同結構的裂紋產生過程。
실효준칙작위판정결구실효적의거，대선박팽당방진분석적준학성유착중요영향。기우3충전형현측결구축척모형적준정태내당성시험，채용등효소성응변준칙、주응변—후도응변준칙이급RTCL（Rice-Tracey&Cockcroft-Latham）준칙대모형시험진행수치모의，비교각준칙대렬문산생적모의효과，토론3충준칙계산적겁한당심화흡능치여시험적오차。연구결과표명，3충준칙균능취득만족공정수요적방진정도，단상대우등효소성응변준칙화주응변—후도응변준칙，인입응력삼축도적RTCL준칙능경준학지모의불동결구적렬문산생과정。
In this paper,the simulation of indentation tests on a set of scaled models is carried out with the finite element method. Three different criteria,the equivalent plastic strain criterion,principal strain-through thickness strain criterion,and RTCL (Rice-Tracey & Cockcroft-Latham) criterion,are employed to simulate the onset of fractures on ship side structures. Then,the penetration depth,absorbed energy,and the location of initial failure simulated under different criteria are compared with the experi?mental results. It is shown that the RTCL criterion,which takes the stress state into consideration by intro?ducing the stress triaxiality,demonstrates better performance in terms of predicting the location of fracture. In brief,this paper provides references for finite element analysis of the structural response during ship col?lision and grounding.
