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。
According to this thought , two jobs are finished primarily . on the one hand , using the elastic results which got from experiment of photoelasticity , considering the model theory of elastic - plasticity and the deformation theory of plasticity , the paper propose hybrid methods for elastic - plastic problems . on the other hand , it can find out a new approach through combining present method with image processing 基于这种设想,主要做了两方面的工作:一是实现了利用光弹性实验的弹性解,结合弹塑性力学模型理论和塑性力学形变理论,求解弹塑性问题的混合解法;二是将上述方法与计算机的图像处理系统相结合,实现方法上的进一步突破。
Most existing constitutive models do not take into account the interactions between different phases of pearlitic steel and cannot illustrate why such kind of materials has excerllent mechanical properties . it is , therefore , necessary to develop a new method , which can describe the macroscopic behavior , damage and failure of the materials and their micro structural dependence . in this paper , based on a non - classical theory of plasticity and the continuum damage mechanics , a damage evolution based on an ellipsoidal void model for mixed hardening materials is obtained 已有的关于珠光体钢的本构模型多难以考虑珠光体材料的微结构及其相互作用,难以解释珠光体材料何以具有较好的综合力学性能,因此有必要发展一种多层次的细观力学分析方法以研究此材料在复杂加载条件下计及微结构特征的宏观响应特性,使材料的强度、疲劳寿命的预测与其微结构及各组成相的损伤及微观应力应变演化规律联系起来,进而为材料微结构的设计提供依据。
Third , a theoretic approach based on total theory of plasticity is for the first time applied to analyze elastoplastic torsion rigidity of the tubular , and the results are well proved by the test data . also for the first time , the plastic stability of the spiral skew stiffening shell is studied . it is shown in the experiments that there is the comparability between the stability of the members at plastic limit and that of the thin - shelled steel tubular with the spiral skew stiffening concrete rib 本文首次分析了扭转作用下的螺旋斜向加劲壳的塑性稳定性问题,还根据试验观象的观察,对构件在塑性极限时的状态,简化为内壁衬朽螺协刹向加劲混凝土肋的薄壁钢管的塑性稳定问题,利用塑性壳体稳定理论进行了探讨。