文档介绍：哈尔滨工程大学硕士学位论文摘要形状记忆合金作为一种新型材料,正广泛地应用在土木、检测、医疗、能源和机械等各个领域,并且日益发挥着越来越重要的作用。形状记忆合金(SMA)作为一种功能材料,主要具有形状记忆效应(S腿) 和伪弹性(PE),二者发生在不同温度范围,由马氏体的相变和重取向引起。 S娅是当温度低于马氏体逆相交结束的温度时,S淞在外力作用下发生变形, 卸载后出现残余变形,这时只要将其加热,当温度超过材料的相交点温度时, slIA就会恢复到原来高温下的状况,好像能记住其最初形状;PE是当温度高于马氏体逆相交结束的温度时,卸载后S凇在外力作用下产生非弹性应交会自动消失。形状记忆合金问题研究的核心之一是给出描述形状记忆合金的本构方程。在对现有的描述形状记忆合金材科本构方程进行全面系统的归结的基础上,基于塑性力学理论,论文给出一种新的形状记忆合金的本构模型。由于材料的有限变形特征,采用有限元程序对单向拉伸和扭转问题进行计算,验证了所给出的本构模型是合理的,这为迸一步从有限变形和塑性变形角度描述形状记忆合金的特征提供了基础。关键词:复合材料;形状记忆合金;本构关系:有限元哈尔滨工程大学硕士学位论文 Abstract As anewintelligent觚喊shape memory alloy(sMA)is widely usedand plays more and more important rolein differentfieldssuch as construction ,medicaltreatment,energy and mechanicalengineering. As Olle oftheabsorbable materials,SMA ischaracterized inshapememory effect(SME)and pseudo-elasticity,which occur indifferenttemperature ranges, causedby martensitephase transformation is theeffect when thetemperature is lowerthanthat atthe end ofinversemartensite phase transformation,SMA transforms under external loads,residual transformation occ啪and SMA will return tothe initial situationunder high temperature when thetemperature exceeds thephase transformation temperature, asifitCan remember isthe effectthat,when the temperature ishigher thaninversemartensite ending temperature,the non-elastic straincaused bySMA under externalloadswilldisappear afterunloading. The keypoint intheinvestigation ofSMA liesinthedescription ofthe thepresentpaper,a newSMA constitutive model isgiven based 011plasticity theoryby thesystematicalSuulmariT础Oll ofSMA constitutive equations presentednowadays. Because ofthe finitetransformationcharacterization,with theapplication of finiteelement method onthecalculation ofunilateraltension andtorsion,which provethe constitutivemodel foundation 斯the furtherinvestigation 011thedescription ofSMA by finite and plastic transfor