Mode-I interlaminar fracture behavior of laminated bamboo composites

Liu, Yanyan; Sheng, Baolu; Huang, Dongsheng; Zhou, Annan

doi:10.1177/1369433220965270

Cited by 12 publications

(4 citation statements)

References 31 publications

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“…Under the action of load, the fiber at the bottom of the reconstituted bamboo bending specimen was pulled off, and the stress in the reconstituted bamboo plate was released rapidly, and the specimen presented brittle tensile fracture, the fracture mode under this experimental environment was consistent with the fracture mode in reference. [ 48 ] The mid span section presented obvious vertical fracture, and the fracture was relatively flush. As shown in Figure 4B,C, with increasing temperature, the fiber soften to some extent.…”

Section: Test Resultsmentioning

confidence: 99%

Bending properties and design strength of reconstituted bamboo at different temperatures

et al. 2022

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Reconstituted bamboo is a unidirectional fiber adhesive material with strong temperature sensitivity. The bending strength and deformation of reconstituted bamboo beams at different temperatures were measured using a three‐point bending test. At 10°C, 30°C, and 50°C, the samples showed a brittle tensile fracture, simple tensile fracture, and splintering tensile fracture modes respectively, the bending failure pattern of reconstituted bamboo was intensified with increasing temperature. The results show that with increasing temperature, the degree of interlaminar debonding cracking and longitudinal tensile fracture is aggravated, accompanied by shearing. The ultimate bearing capacity of the reconstituted bamboo decreased from 182.25 MPa to 124.89 MPa (a reduction of 31.47%) and the flexural modulus decreased from 11,329.25 MPa to 8679.90 MPa (a reduction of 23.39%) as the temperature increased from 10°C to 50°C. The temperature has little effect on the initial stiffness, and the postelastic stiffness decreases significantly (by 53.01%) with increasing temperature. The thermal softening effect has a significant influence on the plastic behavior of bamboo. A model of the design value of bending strength considering the temperature was established, and the design value of bending strength was evaluated.

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Section: Test Resultsmentioning

confidence: 99%

Bending properties and design strength of reconstituted bamboo at different temperatures

et al. 2022

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“…In addition, this difference is influenced by the distribution of fibers, showing a more complex mode of variation. The fracture of bamboo along the fiber direction is generally brittle fracture mode [35][36][37]. When bamboo cracks, the crack propagates at the interface between the fiber and the matrix, forming an inter-layer fracture.…”

Section: Methodsmentioning

confidence: 99%

Quasi-ductile fracture behavior of glubam due to transverse fiber distribution

Jiang,

Liu

2024

Preprint

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The cracking of fibrous composites is inevitable, and the cracking mode is depended on its fiber distribution. In this study, bamboo fibrous composites are selected to investigate the effect of fiber distribution on crack propagation. Glued-laminated bamboo (Glubam) is a bi-directional bamboo fibrous composites, usually used as a board member, its vertical thickness (V direction) is about 28 mm, and with the longitudinal fiber layers (L direction) to transverse fiber layers (T direction) setting a 4:1. Considering that there are fewer transverse fibers in glubam, it is more prone to cracking under transverse load, this study researches the mode-I fracture characteristics of glubam in the TV direction. The three-point bending (3-p-b) fracture test of glubam specimens with single-edge notches (SEN) was carried out in this study. The deformation curves show that the specimens still have the load-carrying capacity after reaching the maximum load, and the load shows a trend of step-like decrease, exhibiting a quasi-ductile fracture behavior. Overall, the fracture process can be divided into four stages, including linear, softening, quasi-ductile, and failure stages. In this study, the tensile strength ft and fracture toughness KIC of glubam in the softening and quasi-ductile stages are calculated using nonlinear elastic fracture mechanics (Non-LEFM) method, and the prefabricated crack length a0 is modified according to the location of the transverse fibers. The deviations of the fracture parameters in the two stages are within 10%, which indicates that the modification of the prefabricated crack length is correct and indirectly demonstrates the correlation between the fracture parameters of the quasi-ductile stage and the transverse fiber position. On the other hand, quasi-ductile fractures exist in other materials and structures, and they all have staggered structures. This staggered structure makes the crack in the form of semi-stable propagation, while the load decreases in a step-like manner.

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“…In addition, this difference is influenced by the distribution of fibers, showing a more complex mode of variation. The fracture of bamboo along the fiber direction is generally of the brittle fracture mode [36][37][38]. When bamboo cracks, the crack propagates at the interface between the fiber and the matrix, forming an inter-layer fracture.…”

Section: Introductionmentioning

confidence: 99%

Study on the Quasi-Ductile Fracture Behavior of Glubam: The Role of Fiber Distribution

Jiang,

Liu

2024

Materials

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Cracking in fibrous composites is inevitable, and the fracture pattern is influenced by its fiber distribution. Bamboo fibrous composites have a distinct fiber distribution, which makes them an excellent material for studng the relationship between fiber distribution and fracture mode. Glued laminated bamboo is a bi-directional bamboo fibrous composite, which is called glubam for short. Its vertical thickness is about 28 mm, and the ratio of the number of longitudinal fiber layers to the number of transverse fiber layers is 4:1. This study conducted three-point bending fracture tests on single-edge notched specimens of glubam to investigate its mode-I fracture characteristics in the transverse vertical direction. The deformation curves show that the specimens still have the load-carrying capacity after reaching the maximum load, and the load shows a trend of step-like decrease, exhibiting a quasi-ductile fracture behavior. Overall, the fracture process can be divided into four stages, including linear, softening, quasi-ductile, and failure stages. In this study, based on certain assumptions, the prefabricated notch length a0 was adjusted according to the position of the transverse fibers. Subsequently, the non-linear elastic fracture mechanics method was employed to calculate the fracture parameters of glubam during the softening and quasi-ductile stages, including the fracture toughness KIC* and fiber tensile strength ft. The deviation of the fracture parameters between the two stages is within 10%, indicating that the correction of the a0 is correct. This indirectly proves that the staggered structure formed by longitudinal and transverse fibers is responsible for the quasi-toughness fracture of glubam. Finally, this study summarized and analyzed the quasi-ductile fracture behavior and found that materials or structures exhibiting quasi-ductile fracture behavior often possess a staggered structure. This staggered structure makes the crack in the form of semi-stable propagation, while the load decreases in a step-like manner.

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Mode-I interlaminar fracture behavior of laminated bamboo composites

Cited by 12 publications

References 31 publications

Bending properties and design strength of reconstituted bamboo at different temperatures

Bending properties and design strength of reconstituted bamboo at different temperatures

Quasi-ductile fracture behavior of glubam due to transverse fiber distribution

Study on the Quasi-Ductile Fracture Behavior of Glubam: The Role of Fiber Distribution

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