TY - JOUR
T1 - Modeling and simulation of quasi-brittle failure with continuous anisotropic stress-based gradient-enhanced damage models
AU - Vandoren, B.
AU - Simone, A.
PY - 2018/4/15
Y1 - 2018/4/15
N2 - Two anisotropic stress-based gradient-enhanced damage models are proposed to address the issue of spurious damage growth typical of continuous standard gradient-enhanced damage models. Both models are based on a decreasing interaction length upon decreasing stresses and do not require additional model parameters or extra degrees of freedom when compared to standard gradient-enhanced models. It is observed that with the proposed models damage spreading is significantly reduced due to the occurrence of non-physical oscillations in the nonlocal strain field near the strain localization band. Model improvements to eliminate these strain oscillations upon vanishing length scale values are proposed. The capability of the models and their patched versions to correctly simulate damage initiation and propagation is investigated by means of mode-I failure, shear band and four-point bending tests.
AB - Two anisotropic stress-based gradient-enhanced damage models are proposed to address the issue of spurious damage growth typical of continuous standard gradient-enhanced damage models. Both models are based on a decreasing interaction length upon decreasing stresses and do not require additional model parameters or extra degrees of freedom when compared to standard gradient-enhanced models. It is observed that with the proposed models damage spreading is significantly reduced due to the occurrence of non-physical oscillations in the nonlocal strain field near the strain localization band. Model improvements to eliminate these strain oscillations upon vanishing length scale values are proposed. The capability of the models and their patched versions to correctly simulate damage initiation and propagation is investigated by means of mode-I failure, shear band and four-point bending tests.
KW - Anisotropic damage
KW - Gradient-enhanced damage
KW - Quasi-brittle failure
KW - Transient length scale
UR - http://www.scopus.com/inward/record.url?scp=85041410540&partnerID=8YFLogxK
UR - http://resolver.tudelft.nl/uuid:15e7a57a-66fa-4900-a0fc-98a6341cbca8
U2 - 10.1016/j.cma.2017.12.027
DO - 10.1016/j.cma.2017.12.027
M3 - Article
AN - SCOPUS:85041410540
SN - 0045-7825
VL - 332
SP - 644
EP - 685
JO - Computer Methods in Applied Mechanics and Engineering
JF - Computer Methods in Applied Mechanics and Engineering
ER -