应变曲线

• The elastic solution for elastic - plastic problem is based on model theory of elastic - plasticity and deformation theory of plasticity . with the original data which embodies the stress state of complicated structure at elastic phase and is attained by experiment or calculation , according to the similarity theory between elasticity and plasticity and generalized stress - strain material curves , and using new means and new techniques , this method and change the elastic value into plastic value correspondingly
  结构弹塑性分析的弹性解法是以弹塑性力学的模型理论和塑性力学形变理论为基础的，具体做法是利用实际工程中由实验或者计算等方法获得表征复杂结构弹性阶段应力状态的原始数据，根据弹性力学和塑性力学方程的相似关系和被实验材料的广义应力应变曲线，采用新的分析方法和实验手段，将弹性解转换成对应的弹塑性解。
• The technique that used to measure the mechanical properties for mems is different from the traditional one considering the size scale . a uniaxial tension test system for test the mechanical property of mems materials is presented in this thesis . the strain is measured by interference strain / displacement gauge ( isdg )
  本文介绍了新近研制的用于测量微电子机械系统mems材料的机械性能的单轴拉伸试验系统，采用激光干涉技术测量试样应变，得到材料从开始变形直至破坏的全历程应力应变曲线。
• The approximate polynomial method was based on neuber ' s method , the cyclic stress - strain responses and neuber ' s rule were treated as probabilistic curves , and the statistic characteristic was obtained from the approximate polynomial . the method is fast and easy for engineering application
  近似的多项式拟合法在诺伯法的基础上，将循环应力应变曲线和诺伯双曲线视为概率曲线，通过建立近似多项式的方法，求得局部应力应变的统计特性，快速简便，适合工程应用。
• Thermal residual stresses in short fiber reinforced metal matrix composites ( sfrmmc ) can reach a high level and have a significant effect on the mechanical properties of composites . in this paper , three dimensional elastoplastic finite element analyses were used to study the thermal residual stresses in sfrmmc and its effect systematically . with the interfacial property , fiber ' s orientation and reciprocity of fibers considered , the thermal residual stresses in - al2o3 / al - 5 . 5mg , - al2o3 / al - 5 . 5zn and - al2o3 / al - 12si alloy composites were calculated and analysed
  本文在分析计算中综合考虑了界面性能、纤维位向以及纤维间相互作用的影响，分别采用单纤维模型、双纤维模型和斜向纤维模型，对- al _ 2o _ 3 al - 5 . 5mg 、 - al _ 2o _ 3 al - 5 . 5zn和- al _ 2o _ 3 al - 12si三种al合金基复合材料的热残余应力进行了计算和分析；对存在热残余应力时复合材料的应力?应变曲线进行了模拟；还基于能量等效原理的有限元方法，考虑了热残余应力及纤维位向的影响，推导了短纤维增强金属基复合材料弹性模量的预测公式。
• The tensile stress - strain curves of composites were also simulated . based on the energy equivalence principle , the formula that could predict the modulus of elasticity of sfrmmc was educed by considering the effects of thermal residual stresses and fiber ' s orientation . calculating and analysis indicate that the thermal residual stresses in sfrmmc are spatially non - uniform
  计算和分析表明，金属基复合材料中热残余应力的分布是空间不均匀的，对复合材料的力学行为产生明显的影响，与不考虑热残余应力相比，其模拟的复合材料应力?应变曲线与实验曲线吻合得较好。
• At the present time , the study of concrete column strengthened with cfrp is mainly focused on stress - strain curve of axial loaded circle column wrapped cfrp , as well as anti - shear 、 anti - bending and anti - seismic performances . however , majority columns subject to eccentric load and their sections are circle in the actual engineering
  目前,国内外关于cfrp加固混凝土柱的研究主要集中于碳纤维布包裹混凝土圆形截面柱的轴心受压下的应力-应变曲线和加固后的抗剪、抗弯、抗震性能研究;而在实际结构工程中,正常使用状况下的混凝土柱大多数都是偏心受力,而且以矩形截面居多。
• The paper studied controlling rotor vibration with the super - elasticity of sma and sfd , set up the new equation of sys tern vibration according to the stress - strain curve of sma in super - elasticity state , used the nonlinear theory and the dynamic stability theory to study the vibration of rotor controlled by sma , discussed the stability condition of the system , obtained the relationship of system parameters when bifurcation was appeared , supposed a method that improves the stability of rotor system and restrains vibration amplitude though changing parameters , and finally validated the effect of restraining vibration of the improved system through emulation
  摘要研究利用形状记忆合金的超弹性和挤压油膜阻尼器控制转子振动，利用形状记忆合金在超弹性状态下的应力应变曲线，建立了新的系统振动方程，运用非线性理论和运动稳定性理论研究转子在形状记忆合金控制下的振动状态，讨论了系统的稳定性条件，获得系统发生分岔时系统参数之间的关系；并提出了通过改变参数来提高系统稳定性和抑制振幅的方法，最后通过仿真验证了改进后的系统振动抑制效果。
• The simulative stress - strain were in good quantitative agreement with experiments as compared with the curves that did n ' t included the thermal residual stresses . comparison of the simulative curves with the experimental curves indicate that , when the volume fraction of fiber is lesser one fiber model is accurate , but when the volume fraction of fiber is biggish two fibers model or the more practical models should be used
  分别用单纤维模型和双纤维模型模拟三种复合材料的应力?应变曲线与实验曲线的比较表明：当纤维体积分数较小时，单纤维模型具有相当好的模拟结果，而当纤维体积分数较大时，则应采用双纤维模型或更符合实际情况的模型。
• 3 . bring forward a new idea : the ideology of synergetics used in atomic simulation and multi - scale simulation of materials design . on the basis of this , next tasks were put forward : ( 1 ) analyzing the changes of stress - strain curves of the interphase before and after pre - treatment ; ( 2 ) the efficient of the coupling effect of o2 , na2s04 and h2o stream on the oxidation and erosion resistance of interphase ; ( 3 ) the methods of improving environment performance of interphase above 1273k
  提出将协同学的思想用于原子级模拟及跨尺度模拟的思路，并在此基础上，提出下一步的工作设想： ( 1 )分析热处理前后界面相区域应力-应变曲线的变化； ( 2 )航空发动机模拟环境中，氧、硫酸钠蒸汽及水蒸汽耦合效应对界面相抗氧化性、抗腐蚀性的影响； ( 3 ) 1273k以上界面相环境性能提高的方法。