On the double transition in the failure mode of polycarbonate
On the double transition in the failure mode of polycarbonate
复制标题
DOI：
10.1016/j.mechmat.2019.103242
复制
发表时间：
2020-01-01
影响因子：
3.9
通讯作者：
Loya, J. A.
中科院分区：
文献类型：
--
作者：
Aranda-Ruiz, J.;Ravi-Chandar, K.;Loya, J. A.
在目前的工作中，通过实验和数值探索了在某些聚合物材料中观察到的从脆性到延性的失效模式的转变，重点关注聚碳酸酯（一种广泛工业用途的聚合物）。两种行为之间的限制取决于几个内在因素，例如温度和变形率，以及外在因素，例如缺口半径和样本厚度。这项工作中探索的参数是样本的厚度和初始凹口相对于对称性的偏移。我们通过聚碳酸酯实验和使用全局损伤模型的数值模拟来探索这种转变。为了实现这一目标，在有限元商业代码 ABAQUS/Explicit 中开发了 VUMAT 用户子程序，该子程序独立地考虑了两种失效准则（脆性和延性）。因此，可以重现经过三点弯曲动态断裂试验的聚碳酸酯样品的失效模式转变。这些数值结果允许观察到可能发生双转变，具体取决于厚度和应变率。
In the present work, the transition in the mode of failure from brittle to ductile, observed in certain polymeric materials, is explored both experimentally and numerically, focusing on polycarbonate, a polymer of wide industrial use. The limit between both behaviours depends on several intrinsic factors, such as temperature and deformation rate, and extrinsic factors such as notch radius and specimen thickness. The parameters that have been explored in this work are the thickness of the specimen and the offset of the initial notch from symmetry. We explore this transition through experiments on polycarbonate and numerical simulations using a global damage model. In order to accomplish this, a VUMAT user subroutine has been developed in the finite element commercial code ABAQUS/Explicit, which takes into account both failure criteria (brittle and ductile), independently. Thus, it has been possible to reproduce the transition in the failure mode of polycarbonate specimens subjected to three point bending dynamic fracture tests. These numerical results have allowed to observe that a double transition may occur, depending on the thickness and strain rate.