Micro-scale progressive damage development in polymer composites under longitudinal loading

2017 ◽  
Vol 111 ◽  
pp. 21-34 ◽  
Author(s):  
Nithin K. Parambil ◽  
Suhasini Gururaja
Keyword(s):  
Polymer Composites ◽  
Progressive Damage ◽  
Damage Development ◽  
Micro Scale ◽  
Longitudinal Loading

Micromechanical Modeling of Damage Development in Polymer Composites

2016 ◽  
Vol 25 (3) ◽  
pp. 096369351602500 ◽  
Author(s):  
T. Arabatti ◽  
N. K. Parambil ◽  
S. Gururaja
Keyword(s):  
Polymer Composites ◽  
Damage Model ◽  
Three Dimensional ◽  
Single Fibre ◽  
Micromechanical Modeling ◽  
Interface Debonding ◽  
Progressive Damage ◽  
Damage Development ◽  
Damage Initiation ◽  
Fibre Breakage

Damage initiation and progression in long fibre unidirectional continuous polymer composites has been studied at the micro-scale considering a three dimensional repeating unit cell (3D-RUC) with square packing consisting of a single fibre in a polymer matrix. Three damage modes under static loading have been looked at, viz., matrix damage, fibre failure and fibre-matrix debonding. A progressive damage model for the matrix, fibre breakage model using maximum stress failure criterion and interface debonding using a traction-separation criterion via cohesive zone modelling (CZM) approach has been implemented. Homogenization of the said 3D-RUC has been conducted for various load cases that describes the averaged response of the microstructure under combined progressive damage modes.

Carbon nanotube-grafted carbon fiber polymer composites: Damage characterization on the micro-scale

2017 ◽  
Vol 126 ◽  
pp. 202-210 ◽  
Author(s):  
Luman Zhang ◽  
Niels De Greef ◽  
Gerhard Kalinka ◽  
Bart Van Bilzen ◽  
Jean-Pierre Locquet ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fiber ◽  
Polymer Composites ◽  
Micro Scale ◽  
Damage Characterization ◽  
Carbon Fiber Polymer

scholarly journals A progressive damage model of composite laminates under low-velocity impact

2021 ◽  
Vol 39 (1) ◽  
pp. 37-45
Author(s):  
Junjie Zhou ◽  
Shengnan Wang
Keyword(s):  
Composite Laminates ◽  
Impact Force ◽  
Damage Model ◽  
Low Velocity Impact ◽  
Progressive Damage ◽  
Low Velocity ◽  
Damage Development ◽  
Velocity Impact ◽  
Progressive Damage Model ◽  
Matrix Damage

In this paper, a progressive damage model for studying the dynamic mechanical response and damage development of composite laminates under low-velocity impact was established. The model applied the Hashin and Hou failure criteria to predict the initiation of intra-laminar damage (fiber and matrix damage); a linear degradation scheme combined with the equivalent displacement method was adopted to simulate the damage development; a cohesive zone model with the bilinear traction-separation relationship was used to predict delamination. A user material subroutine VUMAT was coded, and the simulation analysis of carbon fiber reinforcement composite laminates subjected to 25 J impact was performed via commercial software ABAQUS. The predicted impact force-time curve, impact force-displacement curve, and damage distribution contours among the layers were in a good agreement with the experimental, which verified the proposed model. According to the simulation results, the fiber damage and matrix damage were analyzed, and the expansion of delamination was discussed.

Modeling of Crack Growth in Steels

2012 ◽  
Vol 726 ◽  
pp. 233-240
Author(s):  
Jacek Jackiewicz
Keyword(s):  
Crack Propagation ◽  
Crack Growth ◽  
Damage Accumulation ◽  
Progressive Damage ◽  
Damage Development ◽  
Special Cases ◽  
Accumulation Of Damage ◽  
Machine Parts ◽  
Selection Of

The paper discusses issues related to the damage accumulation and cracking in steels. Special attention is paid to the selection of appropriate methods in the modeling of progressive damage development. In special cases, the accumulation of damage and crack propagation may lead to the brutal destruction of machine parts. In addition, some attention was drawn to the conditions that can lead to this brutal destruction.

Micromechanics of Damage Development in Polymer Composites

2014 ◽  
Author(s):  
Trupti Arabatti ◽  
Aswathi Sudhir ◽  
Suhasini Gururaja
Keyword(s):  
Polymer Composites ◽  
Plastic Material ◽  
Cohesive Zone Modeling ◽  
Damage Development ◽  
Fiber Failure ◽  
Damage Initiation ◽  
Finite Element Software ◽  
The Matrix ◽  
Fiber Matrix ◽  
Matrix Damage

Damage initiation and progression in uni-directional continuous polymer composites at the microscale has been investigated by considering a 3D Repeating Unit Cell (RUC) with square distribution of fibers. Three damage modes under static loading have been looked at, viz., matrix damage, fiber failure and fiber-matrix debonding. The matrix has been modeled as an isotropic elastic-plastic material via a user material subroutine (UMAT) within the framework of the finite element software Abaqus. In addition, fiber-matrix debonding has been simulated using a traction-separation criterion via Cohesive Zone Modeling (CZM) approach. Finally, a user defined field (USDFLD) has been used to simulate the fiber breakage. The combined effect of matrix-damage, fiber failure and interfacial debonding has then been studied using homogenization principles. Preliminary results from the current modeling approach have been found to be encouraging and this approach paves way for more complex multi-scale damage simulations in heterogeneous materials.

scholarly journals Finite element simulations for investigating the strength characteristics of a 5 m composite wind turbine blade

2020 ◽  
Vol 5 (4) ◽  
pp. 1339-1358
Author(s):  
Can Muyan ◽  
Demirkan Coker
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Mechanical Response ◽  
Leading Edge ◽  
Wind Turbine Blade ◽  
Strength Characteristics ◽  
Progressive Damage ◽  
Damage Development ◽  
Extreme Load

Abstract. Full-scale structural tests enable us to monitor the mechanical response of the blades under various loading scenarios. Yet, these tests must be accompanied by numerical simulations so that the physical basis of the progressive damage development can be better interpreted and understood. In this work, finite element analysis is utilized to investigate the strength characteristics of an existing 5 m RÜZGEM composite wind turbine blade under extreme flapwise, edgewise and combined flapwise plus edgewise loading conditions. For this purpose, in addition to a linear buckling analysis, Puck's (2D) physically based phenomenological model is used for the progressive damage analysis of the blade. The 5 m RÜZGEM blade is found to exhibit sufficient resistance against buckling. However, Puck's damage model indicates that laminate failure plays a major role in the ultimate blade failure. Under extreme flapwise and combined load cases, the internal flange at the leading edge and the trailing edge are identified as the main damaged regions. Under edgewise loading, the leading edge close to the root is the failure region. When extreme load case is applied as a combination of edgewise and flapwise loading cases, less damage is observed compared to the pure flapwise loading case.

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