论文标题
非弹性断裂的非局部内凝结连续性力学和内聚体动力建模(CPDM)
On Nonlocal Cohesive Continuum Mechanics and Cohesive Peridynamic Modeling (CPDM) of Inelastic Fracture
论文作者
论文摘要
在这项工作中,我们开发了一种基于键的凝聚性脑动力学模型(CPDM),并将其应用于模拟非弹性裂缝,并使用中尺度的Xu-needleman凝聚力。通过这样做,我们成功地开发了一种具有内在应力/应变度量以及一致和内置的宏观构型关系的基于键的内聚力连续性力学模型。这项工作的主要新颖性是:(1)我们已经表明,所提出的非局部粘性连续力力学模型的内聚应力与非局部植物性动力压力完全相同; (2)我们首次在基于键的凝聚力纤维动力学中采用了不可逆的内置内聚力应变关系来对非弹性材料行为进行建模,而无需开具现象学可塑性应激关系; (3)粘性键具有轴向和切向成分,它们具有可变泊松比的非线性本构关系; (4)基于键的内聚力组成模型与粘性断裂标准一致,(5)我们已经表明,该方法能够对非局部凝聚性连续性中的小尺度屈服的延性裂缝进行模拟模拟。 已经提出了几个数值示例与有限元基于有限元的连续性内聚区模型进行了比较,该模型表明,该方法是一种简单,有效的方法,可以在非局部凝聚介质中对非弹性断裂进行建模。
In this work, we developed a bond-based cohesive peridynamics model (CPDM) and apply it to simulate inelastic fracture by using the meso-scale Xu-Needleman cohesive potential . By doing so, we have successfully developed a bond-based cohesive continuum mechanics model with intrinsic stress/strain measures as well as consistent and built-in macro-scale constitutive relations. The main novelties of this work are: (1) We have shown that the cohesive stress of the proposed nonlocal cohesive continuum mechanics model is exactly the same as the nonlocal peridynamic stress; (2) For the first time, we have applied an irreversible built-in cohesive stress-strain relation in a bond-based cohesive peridynamics to model inelastic material behaviors without prescribing phenomenological plasticity stress-strain relations; (3) The cohesive bond force possesses both axial and tangential components, and they contribute a nonlinear constitutive relation with variable Poisson's ratios; (4) The bond-based cohesive constitutive model is consistent with the cohesive fracture criterion, and (5) We have shown that the proposed method is able to model inelastic fracture and simulate ductile fracture of small scale yielding in the nonlocal cohesive continua. Several numerical examples have been presented to be compared with the finite element based continuum cohesive zone model, which shows that the proposed approach is a simple, efficient and effective method to model inelastic fracture in the nonlocal cohesive media.