不同加筋结构在水中接触爆炸下的破损规律

采用LS-DYNA对不同加筋强度和不同加筋位置的筋板结构的水中接触爆炸进行了数值模拟,定 义描述不同加筋强度、位置的强度因子和距离因子,建立不同强度因子的6种加筋模型和不同距离因子的3 种加筋模型。通过对水中接触爆炸下典型加筋结构破损过程分析和不同模型纵、横破口长度和破口面积的对 比,得到了加筋板在水中接触爆炸下强度因子、距离因子对破口形状和大小的影响规律。结果表明:增大纵横 方向强度因子能有效抑制破口面积,增大横向强度因子对破口无明显影响;药量一定情况下,距离因子与破口 面积成正比,破口形状与距离、强度因子相关。

Damage of different reinforced structures subjected to underwater contact explosion

LS-DYNAwasusedtosimulatetheresponsesofdifferentreinforcedstructuressubjectedto underwatercontactexplosionbyconsideringdifferentreinforcementstrengthsandlocations.Strength anddistancefactorsweredefinedtodescribethestrengthandlocationsofstiffeners,respectively.Six modelswereproposedwithdifferentstrengthsofstiffenersandthreemodelsweredevelopedwithdifferentlocationsofstiffeners. Typicaldamageprocessesofthereinforcedstructureswereanalyzed. Thehorizontalandverticalcracklengthsofcrevassewerecomparedaswellascrevassearea.The effectsofthestrengthanddistancefactorswerefoundonthereinforcedstructuressubjectedtounderwatercontactexplosion. Theresultsshowthatitcanbeeffectivetorestraincrevasseareawhenthe strengthfactorrisesintheverticaldirectionanditisnotsignificantwhenthestrengthfactorrisesin thehorizontaldirection.Thedistancefactorisindirectproportiontocrevasseareaandthecrevasse shapesarerelatedtobothofthetwofactorsdefined.