Determination of pure mode-I fracture toughness of multidirectional composite DCB specimens

Jia, Ruodi; Zhao, Libin; Curti, Rémi; Gong, Xiaojing

doi:10.1016/j.engfracmech.2021.107776

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…When the reinforcing materials in acid environment are studied, it is observed that there is no sufficient data to compare their fatigue behaviors with. It should be noted that the fatigue life was strongly intermingled with ply configuration and delamination 4,25,27 . Moreover, the delamination behavior after fatigue has not been extensively understood and the calculation techniques for delamination need to be established.…”

Section: Introductionmentioning

confidence: 99%

“…24 In general, the delamination damage tolerant approach relies on the assessment of initial crack length, delamination growth and residual strength were adopted. 23 The relations of parameters on various materials, 25 direction of fibers and sequences of layers, 26 have been addressed and various interpretations have been made.…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that the fatigue life was strongly intermingled with ply configuration and delamination. 4,25,27 Moreover, the delamination behavior after fatigue has not been extensively understood and the calculation techniques for delamination need to be established.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue damage propagation of FRP under coupling effect of cyclic load and corrosion

Xia,

Feng,

Xin

et al. 2023

Polymer Composites

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Interlaminar fracture or delamination is one of the major failure modes for fiber reinforced polymer (FRP) laminate. Especially, the synergistic effect of environmental exposure and fatigue loads accelerates interface degradation. The main objective in this work was to investigate the fatigue damage propagation of basalt FRP (BFRP) laminate under coupling of acidic environment and fatigue load. The fatigue cycling of 40,000 and the maximum stress of 30% fu (fu = ultimate tensile strength) were adopted. The fatigue specimens under air condition (air fatigue), immersing in water (water fatigue) and immersing in acid (acid fatigue) were introduced. The double cantilever beam (DCB) test was used to evaluate the interlaminar damage of BFRP laminate after fatigue cycling. The fatigue damage propagation mechanism was explored by means of failure modes, load displacement curves, mode I fracture toughness and crack propagation resistance model. The results show that the fatigue weakened the interlaminar properties and resulted in reduced fiber bridging. Especially for the acid fatigue, the laminate was damaged by the coupling of fatigue and acid corrosion. The linear loading stage, nonlinear slow growing stage, stable crack propagation stage and linear unloading stage for DCB after fatigue were observed in the load–displacement curve. The fatigue cycling has caused fracture toughness decrease of 15.0%, 13.8% and 24.1% on air fatigue, water fatigue and acid fatigue respectively. Compared to air fatigue, additional 9.1% interlaminar toughness decrease was evidenced for acidic corrosion fatigue due to the coupling effect of chemical corrosion and physical swelling. The fluctuating decline of crack resistance was caused by discontinuous interface damage, and the interlayer damage was randomly distributed. Thus the interface damage model was proposed to characterize the damage distribution and the damage size.Highlights Degradation law of BFRP under the coupling effect of acid immersion and fatigue load. Interface damage model for characterization of the damage distribution and damage size. Fatigue damage propagation of BFRP under coupling effect of cyclic load and corrosion.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fatigue damage propagation of FRP under coupling effect of cyclic load and corrosion

Xia,

Feng,

Xin

et al. 2023

Polymer Composites

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“…This phenomenon can be induced easily inside composite structures or near laminate edges where three-dimensional stress state occurs. In the current literature, there is considerable amount of papers devoted to research of delamination process, both numerically and experimentally [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. According to the fracture mechanics approach, delamination process can be analyzed by comparing fracture toughness represented by the energy release rate (ERR) at delamination interface.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research of Delamination Process in CFRP Laminates with Bending-Twisting Elastic Couplings

Rzeczkowski

Samborski

2022

Materials

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This paper aims at experimental and numerical research of delamination process in carbon/epoxy composite laminates with different fiber orientation angles in stacking sequence exhibiting the bending–twisting elastic couplings. Experimental specimens were subjected to the double cantilever beam (DCB) tests according to the ASTM D5528 regulations. Values of the mode I strain energy release rates were calculated by using three different data reduction schemes: the modified beam theory, the compliance calibration method and the modified compliance calibration. Determination of delamination initiation point was conducted in twofold way: by visual observation of crack tip using high resolution camera and by utilization of the acoustic emission technique. Numerical analyss were prepared in Abaqus/CAE Software environment by using the virtual crack closure technique (VCCT). The numerical beam model consisted of SC8R continuum shell elements. Obtained outcomes revealed that extensive fiber bridging phenomenon occurring during delamination process pronouncedly affected propagation values of strain energy release rate (GIprop) and numerically obtained load–displacement curves. Nevertheless, in initial stage of delamination, results obtained by using the VCCT were in agreement with experimental data. The greatest value of the mode I fracture toughness equal 0.56 N/mm was obtained for the BT45 laminate.

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An efficient model for predicting complex delamination front of elastic coupling laminates

Xia

Gong

Zhao

et al. 2023

Composite Structures

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Determination of pure mode-I fracture toughness of multidirectional composite DCB specimens

Cited by 6 publications

References 27 publications

Fatigue damage propagation of FRP under coupling effect of cyclic load and corrosion

Fatigue damage propagation of FRP under coupling effect of cyclic load and corrosion

Experimental and Numerical Research of Delamination Process in CFRP Laminates with Bending-Twisting Elastic Couplings

An efficient model for predicting complex delamination front of elastic coupling laminates

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