Fatigue Fracture Resistance Analysis of Polymer Composites Based on the Energy Expended on Damage Formation

Aglan, H.; Gan, Yong X.; Chu, F.; Zhong, Wei

doi:10.1177/0731684403022004842

Cited by 11 publications

(4 citation statements)

References 44 publications

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“…Hahn and Kim [17] used the width of the hysteresis loop, measured intermittently, as a measure of damage. Aglan et al related crack propagation with hysteresis, an approach that requires locating and identifying a major crack in the material, a difficult problem in composites since damage zones may contain several cracks [36,37]. Identifying the critical crack in a composite laminate is not trivial.…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…Aglan et al used hysteresis area along with crack propagation measurements to calculate a specific energy of damage from cyclic energy dissipation [36,37]. Hahn and Kim [17] plotted the horizontal width of the hysteresis loop as a function of life, while Sarkani et al [38] employed the center of gravity of the loop which was found to increase linearly with fatigue damage.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Hysteresis Evolution as a Damage Parameter for Notched Composite Laminates

Tan

Dharan

2010

Journal of Composite Materials

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In cyclically loaded polymer matrix composites, structural health monitoring is useful for detecting and tracking progressive damage. Existing approaches use stiffness degradation, crack propagation/strain energy change, or dynamic parameters such as frequency response. These approaches, however, depend on prior assumptions of the dominant damage mechanisms. In this study, a new hysteresis-based damage parameter, D′, that is a measure of damage progression and failure is shown to be more sensitive than stiffness degradation and can be determined during cycling without the use of additional instrumentation. D′ was measured for cyclically loaded notched glass fiber laminates and was found to be useful as a measure of damage progression. Cyclic hysteresis strain energy dissipated at each cycle was monitored continuously without interruption. A conventional servo-hydraulic fatigue testing system was modified with the incorporation of new custom code for performing command and data acquisition on a cycle-by-cycle basis. In this fashion, progressive damage at each cycle was determined quantitatively in real time during each test. Hysteresis data were obtained from fatigue tests conducted on notched [0/90] E-glass/epoxy laminates in real time on a cycle-by-cycle basis and used to estimate failure. The damage parameter D′ exhibited an approximately linear increase with cycling followed by an exponential increase just before failure. Modeling this behavior allowed for the prediction of damage progression and residual life as a function of load cycles. Hysteresis-based damage parameters for other material configurations were also calculated and found to give good estimates for the cyclic life.

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Section: Analysis and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cyclic Hysteresis Evolution as a Damage Parameter for Notched Composite Laminates

Tan

Dharan

2010

Journal of Composite Materials

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“…Sutton et al [36] investigated the fatigue behavior of PI-based composites using the concept of damage formation. This theory considers a fatigue crack and the surrounding processing zone at its tip as a thermodynamic object, where the material damage degree is associated with the system entropy and the energy dissipation rate for the initiation of a new surface.…”

Section: Introductionmentioning

confidence: 99%

Estimating Low- and High-Cyclic Fatigue of Polyimide-CF-PTFE Composite through Variation of Mechanical Hysteresis Loops

et al. 2022

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The fatigue properties of neat polyimide and the “polyimide + 10 wt.% milled carbon fibers + 10 wt.% polytetrafluoroethylene” composite were investigated under various cyclic loading conditions. In contrast to most of the reported studies, constructing of hysteresis loops was performed through the strain assessment using the non-contact 2D Digital Image Correlation method. The accumulation of cyclic damage was analyzed by calculating parameters of mechanical hysteresis loops. They were: (i) the energy losses (hysteresis loop area), (ii) the dynamic modulus (proportional to the compliance/stiffness of the material) and (iii) the damping capacity (calculated through the dissipated and total mechanical energies). On average, the reduction in energy losses reached 10–18% at the onset of fracture, whereas the modulus variation did not exceed 2.5% of the nominal value. The energy losses decreased from 20 down to 18 J/m3 (10%) for the composite, whereas they reduced from 30 down to 25 J/m3 (17%) for neat PI in the low-cycle fatigue mode. For high-cycle fatigue, energy losses decreased from 10 to 9 J/m3 (10%) and from 17 to 14 J/m3 (18%) for neat PI and composite, respectively. For this reason, the changes of the energy losses due to hysteresis are of prospects for the characterization of both neat PI and the reinforced PI-based composites.

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“…The energy dissipated into damage formation is considered as the indentation penetration driving force. A materials parameter, the specific energy of damage is used as the contact damage tolerance criterion as previously introduced for some materials in [41][42][43][44][45][46]. Correlation between the contact damage tolerance and the microstructure of the material is made.…”

Section: Contact Damage Propagation Stage: Macroscale Approachmentioning

confidence: 99%

Energy Dissipation Criteria for Surface Contact Damage Evaluation

Gan¹

2012

Continuum Mechanics - Progress in Fundamentals and Engineering Applications

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IntroductionThis chapter presents the energy dissipation approach for analyzing surface contact damages in various materials, including composite materials. As known, surface contact is a very common phenomenon, which can be found in daily life and many scientific and engineering problems. The contact of different bodies can be modeled as indentation. Analysis of indentation and modeling of the deformation states of indented materials are often difficult because of the complexity of stress distributions within indentation zones. It is a l s o v e r y d i f f i c u l t t o e v a l u a t e s t r e s s s t a t e s i n r e g i o n s u n d e r n e a t h a n i n d e n t e d z o n e . Instrumental indentation has been performed on various materials including composite materials. Experimental studies on indention of coatings and brittle materials have been reported extensively, but the criterion for evaluating the extent of damage is not unified. Ductile materials deform relatively stable in indentation processes. While brittle materials are sensitive to compressive contact loadings in view of the formation of surface cracks. Therefore, it is difficult to find a unified stress or strain based damage criterion to characterize the damage evolution. Energy dissipation analysis may be more accurate to describe the deformation behavior of such materials. Specifically, under wedge indentation, the analysis should be investigated because the stress field has the singularity which limits the applicability of the strength criterion. In this chapter, the load-displacement relations with elastic-plastic responses of the materials associated with the indentation processes will be obtained to calculate the hysteresis energy. Lattice rotation measurement using electron backscatter diffraction (EBSD) technique will be performed in the region ahead of the indenter tip to measure the dimension of the contact damage zone (CDZ) and the results will be used to define the length scales in contact deformation. A unified criterion using the hysteresis energy normalized by the length scales will be established.Damage evolution in composite materials is very sensitive to the interaction of reinforcements and matrices in interface regions. For example, the development of damage in glass particle and fiber reinforced epoxy composite materials is strongly influenced by the interface debonding conditions [1]. However, the exact effect of bonding conditions on the performance of particle filled composite materials is still not fully understood. Kawaguchi and Pearson [2] reported that strong matrix-particle adhesion may lower the fatigue crack propagation resistance. While the studies on Si 3 N 4 nanoparticle filled epoxy composites www.intechopen.com Continuum Mechanics -Progress in Fundamentals and Engineering Applications

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Fatigue Fracture Resistance Analysis of Polymer Composites Based on the Energy Expended on Damage Formation

Cited by 11 publications

References 44 publications

Cyclic Hysteresis Evolution as a Damage Parameter for Notched Composite Laminates

Cyclic Hysteresis Evolution as a Damage Parameter for Notched Composite Laminates

Estimating Low- and High-Cyclic Fatigue of Polyimide-CF-PTFE Composite through Variation of Mechanical Hysteresis Loops

Energy Dissipation Criteria for Surface Contact Damage Evaluation

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