Damage mechanics, fracture, fatigue, blast, impact, damage modelling

2010 ◽  
Keyword(s):  
Damage Mechanics ◽  
Impact Damage ◽  
Damage Modelling

Analysis on Low Velocity Impact Damage and Compressive Residual Strength of Composite Laminates

2014 ◽  
Vol 566 ◽  
pp. 463-467
Author(s):  
Pu Xue ◽  
H.H. Chen ◽  
W. Guo
Keyword(s):  
Experimental Data ◽  
Residual Strength ◽  
Composite Laminates ◽  
Damage Mechanics ◽  
Impact Damage ◽  
Numerical Results ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
The Impact

This paper studies the impact damage under low velocity impact for composite laminates based on a nonlinear progressive damage model. Damage evolution is described by the framework of the continuum damage mechanics. The real impact damage status of composite laminates has been used to analyze the residual compressive strength instead of assumptions on damage area after impact. The validity of the methodologies has been demonstrated by comparing the numerical results with the experimental data available in literature. The delamination area has an error of 11.3%. The errors of residual strength and compressive displacement are 8.9% and 15%, which indicate that the numerical results matched well with the experimental data.

Prediction of Impact Damage of Composite Laminates Using a Mixed Damage Model

2014 ◽  
Vol 513-517 ◽  
pp. 235-237
Author(s):  
Shi Yang Zhao ◽  
Pu Xue
Keyword(s):  
Composite Laminates ◽  
Damage Mechanics ◽  
Failure Modes ◽  
Impact Damage ◽  
Damage Model ◽  
Material Model ◽  
Element Model ◽  
Fiber Damage ◽  
Damage Process ◽  
Matrix Damage

In order to effectively describe the damage process of composite laminates and reduce the complexity of material model, a mixed damage model based on Linde Criteria and Hashin Criteria is proposed for prediction of impact damage in the study. The mixed damage model can predict baisc failure modes, including fiber fracture, matrix tensile damage, matrix compressive damage. Fiber damage and matrix damage in compression are described based on the progressive damage mechanics; and matrix damage in tension is described based on Continuous Damage Mechanics (CDM). Meanwhile, for interlaminar delamination, damage is described by cohesive model. A finite element model is established to analyze the damage process of composite laminate. A good agreement is got between damage predictions and experimental results.

A damage mechanics model for low-velocity impact damage analysis of composite laminates

2017 ◽  
Vol 121 (1238) ◽  
pp. 515-532 ◽  
Author(s):  
N. Li ◽  
P.H. Chen ◽  
Q. Ye
Keyword(s):  
Composite Laminates ◽  
Damage Mechanics ◽  
Failure Modes ◽  
Impact Damage ◽  
Matrix Cracking ◽  
Low Velocity Impact ◽  
Fracture Plane ◽  
Low Velocity ◽  
Velocity Impact ◽  
The Impact

ABSTRACTA method was developed to predict numerically the damage of composite laminates with multiple plies under low-velocity impact loading. The Puck criterion for 3D stress states was adopted to model the intralaminar damage including matrix cracking and fibre breakage, and to obtain the orientation of the fracture plane due to matrix failure. According to interlaminar delamination mechanism, a new delamination criterion was proposed. The influence of transverse and through-thickness normal stress, interlaminar shear stress and damage conditions of adjacent plies on delamination was considered. In order to predict the impact-induced damage of composite laminates with more plies quickly and efficiently, an approach, which can predict the specific damage of several plies in a single solid element, was proposed by interpolation on the strains of element integration points. Moreover, the proposed model can predict specific failure modes. A good agreement between the predicted delamination shapes and sizes and the experimental results shows correctness of the developed numerical method for predicting low-velocity impact damage on composite laminates.

IMPACT DAMAGE DETECTION IN COMPOSITE AEROSPACE STRUCTURES BY MULTI-RESOLUTION NDE INSPECTIONS

2021 ◽  
Author(s):  
MARGHERITA CAPRIOTTI ◽  
ANDREW ELLISON ◽  
HYUNGSUK E. KIM ◽  
FRANCESCO LANZA DI SCALEA ◽  
HYONNY KIM
Keyword(s):  
Damage Detection ◽  
Damage Mechanics ◽  
Complex Geometry ◽  
Impact Damage ◽  
Ct Scanning ◽  
Quantitative Information ◽  
Guided Wave ◽  
Mode Interaction ◽  
Damage State ◽  
Aerospace Structures

Assessing the health of aerospace structures and understanding the underlying mechanics that govern composite strength constitute a main focus of research in the area of aerospace design and airworthiness certification. Impact damage is one of the major threats to composite aerospace structures for its frequency of occurrence, complexity and minimum external visibility. While non-destructive evaluation (NDE) provides a variety of solutions to inspect the subsurface and internal components of structures non-invasively, a gap exists between the mechanics of damage formation, growth and tolerance, and the inspectability of the structure. This study is focused on the quantitative correlation between impact damage mechanics and ultrasonic NDE inspections, where damage severity, mode interaction and progression are identified in real-scale composite panels of complex geometry, representative of commercial aircraft, impacted to reproduce different damage types at the skin-to-stringer interface and the stringer cap. High resolution X-ray CT scanning and conventional ultrasonic scanning (UT) have been used to map the damage state and identify relevant impact damage features. Ultrasonic guided wave (UGW) scanning was then employed as a rapid in-situ inspection technique to not only detect damage but also provide quantitative information about damage severity and mode. The correlation of multi-resolution multi-dimensional NDE data promises new insights on damage studies and solutions to damage detection and prognosis through viable NDE inspections.

A new approach of graded damage modelling

2018 ◽  
Vol 24 (6) ◽  
pp. 1922-1934
Author(s):  
Claude Stolz
Keyword(s):  
Analytical Solutions ◽  
Damage Mechanics ◽  
Point Of View ◽  
The Body ◽  
Internal Constraints ◽  
New Approach ◽  
Signed Distance ◽  
Damage Modelling ◽  
Radial Loading ◽  
Gradient Amplitude

To prevent the problem of spurious localisation in damage mechanics, it is necessary to control the damage gradient amplitude. The body is decomposed in three domains: the undamaged body where ([Formula: see text]), the transition zone ([Formula: see text]) and the totally broken body ([Formula: see text]). For the thick level set (TLS) model, damage is a function of the signed distance to the surface [Formula: see text]. In this article, we propose to control the damage gradient using a convex internal constraint. This point of view produces a new description of graded damage. Analytical solutions on spheres and cylinders under radial loading are given and discussed. For particular internal constraints, the TLS results are recovered.

scholarly journals Prediction of Load-Bearing Capacity of Composite Parts with Low-Velocity Impact Damage: Identification of Intra- and Inter-Ply Constitutive Models

2020 ◽  
Vol 1 (1) ◽  
pp. 59-78
Author(s):  
Aleksandr Cherniaev ◽  
Svetlana Pavlova ◽  
Aleksandr Pavlov ◽  
Valeriy Komarov
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Bearing Capacity ◽  
Damage Mechanics ◽  
Impact Damage ◽  
Element Model ◽  
Physical Parameters ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Simulation Methodology

Assessments of residual load-carrying capacity are often conducted for composite structural components that have received impact damage. The availability of a verified simulation methodology can provide significant cost savings when such assessments are required. To support the development of a reliable and accurate simulation methodology, this study investigated the predictive capabilities of a stacked solid-shell finite element model of a cylindrical composite component with a damage mechanics-based description of the intra-ply material response and a cohesive contact model used for simulation of the inter-ply behavior. Identification of material properties for the model was conducted through mechanical characterization. Special attention was paid to understanding the influence of non-physical parameters of the intra- and inter-ply material models on predicting compressive failure load of damaged composite cylinders. Calibration of the model conducted using the response surface methodology allowed for identifying rational values of the non-physical parameters. The results of simulations with the identified and calibrated finite element model showed reasonable correlation with experimental data in terms of the predicted failure loads and post-impact and post-failure damage modes. The investigated modeling technique can be recommended for evaluating the residual load-bearing capacity of flat and curved composite parts with impact damage working under the action of compressive loads.

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