Mode I Fracture Toughness of Fiber Reinforced Composite-Wood Bonded Interface

Davalos, Julio F.; Qiao, Pizhong; Madabhusi-Raman, Prabhu; Lang, Elemer M.

doi:10.1177/002199839803201005

Cited by 25 publications

(13 citation statements)

References 9 publications

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“…By dividing the free energy over contact area, we obtain the normalized adhesion energy as 29.89 mJ/m 2 . The macroscopic values of adhesion energy for FRP-wood interface are at the magnitude of J/m 2 [59], while our quantified values of cellulose-epoxy interface using MD simulations are at the magnitude of mJ/m 2 . The possible reasons to the difference in value are that the adhesion energy is sensitive to the flatness of the bonded interface and the length scale of materials.…”

Section: Molecular Dynamics Simulationsmentioning

confidence: 88%

Effect of moisture on the mechanical properties of CFRP–wood composite: An experimental and atomistic investigation

Zhou

Tam

et al. 2015

Composites Part B: Engineering

128

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Section: Molecular Dynamics Simulationsmentioning

confidence: 88%

Effect of moisture on the mechanical properties of CFRP–wood composite: An experimental and atomistic investigation

Zhou

Tam

et al. 2015

Composites Part B: Engineering

128

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“…The expression for compliance ratechange dC/da is obtained by differentiating the expression for compliance C with respect to the crack length a. The details of the specimen design and applications for wood-FRP interface fracture studies are given in several papers by Davalos et al [5][6][7][8][9] and Qiao et al [10]. The geometric details of the CDCB specimen are shown in Figure 2, and the adherends consist of red maple wood and pultruded phenolic FRP with the contoured portions made of laminated veneer lumber (LVL).…”

Section: Materials and Specimenmentioning

confidence: 99%

“…An inadequate interface bond strength and integrity can lead to delamination and premature failure of a hybrid wood-FRP composite [4] and affect the service performance of the product. Several adhesive systems have been successfully used to bond composites with wood, and valuable information on service performance (long-term durability) and delamination behavior (fracture toughness data) for wood-FRP bonded interfaces has been presented by Davalos et al [5][6][7][8][9] and Qiao et al [10]. However, the fatigue fracture behavior of wood-FRP interfaces has not yet been explored until the present work.…”

Section: Introductionmentioning

confidence: 99%

Study of Load Ratio for Mode-I Fatigue Fracture of Wood-FRP-Bonded Interfaces

Jia

Davalos

2004

Journal of Composite Materials

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This paper presents the fatigue behavior of interface bond between red maple wood and phenolic FRP substrates. Using linear elastic fracture mechanics concepts, the influence of load ratio on fatigue crack propagation rate is studied. A contoured double cantilever beam (CDCB) specimen is adopted in this study in order to obtain constant strain energy release rate independent of crack length. The compliance method is used for measuring the crack growth rate. A modified Paris Law equation based on strain energy release rate range, ÁG, and mean value of strain energy release rate, G mean , is proposed in this study for efficient evaluation of load ratio effect on fatigue crack propagation of the bonded interfaces. Follow-up environmental effects are being examined by means of the same energy parameters of the present study and without the need to consider crack closure. The proposed approach can further be extended to characterization of other bonded interfaces for dissimilar materials.KEY WORDS: contoured double cantilever beam (CDCB) specimen, crack propagation rate da/dN, load ratio R, crack opening displacement (COD), strain energy release rate.

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“…For this reason, many researchers carried out studies on the composite materials and aimed to reveal the breaking behavior of the composites. From this aspect, the researchers investigated the effects of organic and inorganic fillers (sand, tree powder) on the mechanical and breaking behaviors of the composites (Davalos et al 1998;Arıkan et al 2004;Samancı 2012;Vipulanandan et al 1989).…”

Section: Introductionmentioning

confidence: 99%

Examining the breaking and bending behaviors of the polymethylmethacrylate composites reinforced with hazelnut shell powder

Büyükkaya¹

2019

Artvin Çoruh Üniversitesi Orman Fakültesi Dergisi

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The objective of the present study is to reveal the toughening effect of the hazelnut shell on the brittle matrices by using the bending and breaking methods. The polymethylmethacrylate composites reinforced with hazelnut shell powder with 50µ particle size at the weight concentrations of 5%, 10%, 15%, and 20% were prepared. The polymer beam samples were exposed to heat cure procedure and the initial notches were created at a/W=0.1, 0.2, 0.3, 0.4, and 0.5. The Mode I breaking behaviors of the notched at single edge and non-notched composite samples were examined by using three-point bending test. The critical stress intensity factor (KIC), J-integral, initial notch depth, and compliance methods were used in calculations. Besides them, the bending module and bending stress values were calculated. The microstructures of HNSP/PMMA composites were determined by using XRD (x-ray diffractometer), FTIR (Fouirer Transform Infrared Spektrofotometre), and SEM (scanning electron microscope) analyses. According to the results obtained, it was determined that the bending strength, elasticity module, and fracture toughness values increased at 10% additive ratio for the HNSP (hasel nut shell flour)/PMMA (polymethylmethacrylate) composites. Özet Çalışmanın amacı, gevrek matrislerde fındıkkabuğunun toklaştırma etkisini eğilme ve farklı kırılma yöntemleri ile ortaya koymaktır. 50µ partikül boyutuna sahip %5, %10, %15 ve %20 ağırlık oranlarında fındıkkabuğu tozu takviyeli /Polimetilmetakrilat kompozitler üretildi. Üretilen polimer kiriş numunelere, ısıl kür işleminden sonra, a/W= 0,1, 02, 03, 04, 0,5 başlangıç çentikleri açıldı. Çentiksiz ve tek kenardan çentik açılmış kompozit numunelerin mode I kırılma davranışları üç nokta eğme testi uygulanarak ortaya konuldu. Kritik Gerilme Şiddet Faktörü (KIC) J-integral, Başlangıç Çentik Derinliği ve Komplians metotları ile hesaplandı. Bununla birlikte eğilme modülü ve eğilme gerilmeleri de belirlendi. HNSF/ PMMA kompozitlerin mikro yapısı XRD, FTIR ve SEM çalışmaları ile ortaya konuldu. Çalışmanın sonuçlarına göre, fındıkkabuğu tozu / Pmma kompozitlere eklenen tozların %10 katkı oranında eğilme kuvveti, eğilme modülü ve kırılma tokluğunu arttırdığı belirlenmiştir.

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Mode I Fracture Toughness of Fiber Reinforced Composite-Wood Bonded Interface

Cited by 25 publications

References 9 publications

Effect of moisture on the mechanical properties of CFRP–wood composite: An experimental and atomistic investigation

Effect of moisture on the mechanical properties of CFRP–wood composite: An experimental and atomistic investigation

Study of Load Ratio for Mode-I Fatigue Fracture of Wood-FRP-Bonded Interfaces

Examining the breaking and bending behaviors of the polymethylmethacrylate composites reinforced with hazelnut shell powder

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