scholarly journals Evaluation of damage evolution of impacted composite laminates under fatigue loadings by infrared thermography and ultrasonic methods

2021 ◽  
Vol 93 ◽  
pp. 106869
Author(s):  
Hongliang Tuo ◽  
Tao Wu ◽  
Zhixian Lu ◽  
Xiaoping Ma
Keyword(s):  
Infrared Thermography ◽  
Composite Laminates ◽  
Damage Evolution ◽  
Ultrasonic Methods

scholarly journals Stress analysis and damage evolution in individual plies of notched composite laminates subjected to in-plane loads

2017 ◽  
Vol 30 (1) ◽  
pp. 447-460 ◽  
Author(s):  
Junshan Hu ◽  
Kaifu Zhang ◽  
Hui Cheng ◽  
Ping Liu ◽  
Peng Zou ◽  
...  
Keyword(s):  
Stress Analysis ◽  
Composite Laminates ◽  
Damage Evolution

Numerical Modeling and Simulation of Delamination Crack Growth in CF/Epoxy Composite Laminates under Cyclic Loading Using Cohesive Zone Model

2011 ◽  
Vol 326 ◽  
pp. 37-52 ◽  
Author(s):  
Hassan Ijaz ◽  
M Aurangzeb Khan ◽  
Waqas Saleem ◽  
Sajid Raza Chaudry
Keyword(s):  
Crack Growth ◽  
Fatigue Damage ◽  
Composite Laminates ◽  
Damage Evolution ◽  
Composite Structures ◽  
Cohesive Zone Model ◽  
Fatigue Loading ◽  
Zone Model ◽  
Evolution Law ◽  
Delamination Crack

This paper presents the mathematical modelling of fatigue damage able to carry out simulation of evolution of delamination in the laminated composite structures under cyclic loadings. A new elastic fatigue damage evolution law is proposed here. A classical interface damage evolution law, which is commonly used to predict static debonding process, is modified further to incorporate fatigue delamination effects due to high cycle loadings. The proposed fatigue damage model is identified using Fracture Mechanics tests like DCB, ENF and MMB. Simulations of delamination under fatigue loading are performed and results are successfully compared with reported experimental data on HTA/6376C unidirectional material. Delamination crack growth with variable fatigue amplitude is also performed and simulation results show that the proposed fatigue damage law can also accommodate this variable amplitude phenomenon. A study of crack tip behaviour using damage variable evolution is also carried out in this paper. Finally the effect of mesh density on crack growth is also discussed.

The Influence of Non-Traditional Composite Laminates on Open-Hole Tension Strength

2007 ◽  
Author(s):  
D. P. Stone ◽  
L. V. Smith ◽  
A. Kothidar
Keyword(s):  
Strain Field ◽  
Composite Laminates ◽  
Damage Evolution ◽  
Adhesive Bonding ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Strain Measurements ◽  
Stress Risers ◽  
Open Hole ◽  
Increased Strength

Composite materials are commonly used in applications with a need for increased strength or reduced weight. The composite structure is often attached using mechanical fasteners, even in cases where adhesive bonding is prevalent. The strength of the composite is typically reduced by large factors in the presence of these stress risers. The following considers the sensitivity of non-traditional layups to stress concentrations in the form of open-hole tension. The effects are described numerically and experimentally using finite element analysis and spatial strain measurements, respectively. Improvements in strength exceeding 10% from this preliminary exercise suggest that tailoring fiber orientations may have potential to minimize the effect of stress concentrations. Consideration of the strain field in the vicinity of the hole showed evidence of damage evolution within approximately 25% UTS for many of the laminates. The maximum strain failure criterion was able to describe the onset of damage or yield for the laminates considered here.

scholarly journals Numerical analysis of intralaminar damage evolution on various composite laminates

2018 ◽  
Vol 400 ◽  
pp. 042031 ◽  
Author(s):  
I Hudisteanu ◽  
N Taranu ◽  
D N Isopescu ◽  
I-S Entuc ◽  
G Oprisan ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Composite Laminates ◽  
Damage Evolution

Investigation of Microcrack Growth in [0/90]s Composite Laminates

2003 ◽  
Author(s):  
Melody A. Verges ◽  
Paul J. Schilling ◽  
Paul D. Herrington ◽  
Arun K. Tatiparthi
Keyword(s):  
Optical Microscopy ◽  
Composite Laminates ◽  
Damage Evolution ◽  
Applied Load ◽  
Three Dimensional ◽  
Three Dimensions ◽  
X Ray ◽  
Computed Microtomography ◽  
X Ray Computed ◽  
Microcrack Growth

Techniques such as optical microscopy and X-radiography have provided useful information regarding damage in composite laminates, particular in therms of microcracking behavior in individual plies. This focuses on the investigation of microcracking and damage evolution in loaded composite laminates via X-ray computed microtomography. The main advantage in the use of such a technique is that damage within the composite can be assessed in three-dimensions without destruction of the composite. In this work, IM7/977–2, IM7/5555, and IM7/5276-1 coupons were uniaxially tested in a tensile substage, Graphs that convey microcracking density information as a function of applied load were created for [0/90/90/0] laminates. The three dimensional geometry and connectivity of microcracks and other damage in these samples were investigated through microtomographic reconstruction.

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