文档介绍：武汉理工大学硕士学位论文冲击载荷作用下结构的动力响应分析姓名:许卫群申请学位级别:硕士专业:固体力学指导教师:吴代华 20040501 武汉理工大学硕士学位论文摘要在爆炸、撞击等强渤载蘅豹作用下结掏将表现出与准静态情形缀不稽同的力学行为。由于外加的裁荷随时间变化褥很快,结构的变形也变化得很快, 惯性力的作用将不可忽略。本文对结构受冲击载荷作用下的动力响应做了一螺磷究,归纳起来主黉蠢以下三个方匿。 1。任意净蠢载瑟佟翔下,篱支粱瑟露蔽交形豹动力确敝褥往。采瘸爨黧性假定,忽略应变强化效应和应变率的散应并考虑由于有隧变形而导致的轴力的影响,研究任意时间历程冲击载葡作用下简支粱的塑性动力响应问题。采用矩形形状的屈服条件,并将粱的邀动依照塑性铰的不间分为四个不麓黥玲致,其中纂一耧雾瑟玲葭为蕈铰逡动搂式,第二器第三验毅为嚣铰运动模式。最后给出了饺意时刻梁的运动状态和变形状态的解析表达式。。研究了工程材料在动力载衙下损伤演化的计冀模型,提出了一般材料在各向异性损伤状态下的两种幼力损伤模型。繁一秘鼓有效应力瓣舔效馕静幂函数为鏊勰,第二季孛鞋损伤殿燹缝释放率为蕊獭。通过数值分褥磷究了损伤结摘元佟的动力确应静特性。。以邓洲桥为研究对象,建立脊限元模型进行汽车碰撞仿真分析。全筒分析桥梁的结构和磁撞特征之后, 掇如了对邓洲桥和汽攀有限元模型的简化方案。采用美国ANSYS公司的有袋元较箨ANSYS/,移裂了蓬壹点附近混凝土、普通钢筋以及预应力钢筋的威力及位移随时阍的变化规律,同时得到了全桥在碰撞腐孵间的应力分布规律和碰撞结束前全桥的变形规律。关键逮:冲击载萄;幼力响应;塑性铰;有限元法武汉理工大学硕士学位论文 Abstract When supporting strongly dynamic loads,such as explosive loads and impulsive loads,the structures willshow differentmechanics characters from standing quasi-static deformation ofthestructurechanges very fast as theloadschange effectoftheinertia forcecan’t dynamic response for thestructure,sustaining impulsive load,has been analyzed according tothefollowing threeaspects inthepaper. dynamic plastic response of thesimple-supported beam considering ofthefinitedeformation under arbitraryimpulsive dynamic plastic response for apinned rigidplastic beam subjected to allarbitrary impulsive distributed load was effectofstrainhardening and strain rate sensitivity yielding curve was assumed wholedynamic response process was classified asfourstages,in which thefirst stage and thefourth one aresingle plastichinge mode,and thesecond and the thirdstage are two plastichinges closed form for thevelocity and deformation of thebeam was obtained. dynamic response forthedamaged model for thedamage evolution ofengineering materials under dynamic loading was models fordynamic damage evolution