A study on ductile fracture of coiled tubing based on cohesive zone model

Zhao, Guanghui; Li, Ju; Zhang, Y.X.; Zhong, Jijia; Zheng, Liancun; Xiao, Shihong

doi:10.1016/j.engfracmech.2019.01.027

Cited by 13 publications

(2 citation statements)

References 29 publications

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“…The damage properties of the adhesive layer are represented by a bilinear cohesive zone model, as shown in Figure 4. [ 37 ] In this figure, k j , t j , and δ j denote the initial stiffness, traction and separation of the cohesive zone, respectively, and the subscripts j = n , s , and t denotes the mutually orthogonal directions of the adhesive layer corresponding to coordinates of ( r, θ , and z ).

t_{j}^{0}

and

δ_{j}^{0}

are the cohesive strength and the corresponding separation.…”

Section: Rve Model Of the Structural Layermentioning

confidence: 99%

Study on progressive damage performance of basalt‐fiber wound composite tube

Zhao

Zhang

et al. 2022

Polymer Composites

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For filament wound composite tubes made of basalt fiber-reinforced polymer (BFRP), damage performances were simulated and load capacity was evaluated with a multi-scale homogenization method based on properties of component materials, fiber volume fraction and the winding process. Considering about both the intra-layer and inter-layer damage properties, a representative volume element (RVE) was defined in the structural layer of the pipe wall firstly. Equivalent mechanical properties of the structural layer were then obtained by simulating damage evolution of the RVE under tension, compression and the shear load. In order to verify the RVE model, tensile tests of the specimens that were cut out of the BFRP tube in both longitudinal and circumferential directions were implemented. The predicted load-displacement curves of the RVE were in good agreement with the corresponding experimental results. Finally, the tube wall was simplified into a three-layer structure including inner lining layer, equivalent structural layer and outer protection layer. Damage evolutions of the tube were calculated under basic loads, borne typically by the oil and gas pipeline, such as internal pressure, tension, bending and torsion. The results lead to a better understanding of the load-bearing capacity of the BFRP tube and promote the application of the BFRP in the oil and gas field.

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t_{j}^{0}

and

δ_{j}^{0}

are the cohesive strength and the corresponding separation.…”

Section: Rve Model Of the Structural Layermentioning

confidence: 99%

Study on progressive damage performance of basalt‐fiber wound composite tube

Zhao

Zhang

et al. 2022

Polymer Composites

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“…In order to avoid effects of both thickness and curvature on the test results, specimens were taken directly from the CT axially, and kept the same arc shape as the CT, as shown in Fig. 2 [22][23]. The width of the middle test section was W = 17 mm.…”

Section: Specimens and Experimental Setupmentioning

confidence: 99%

Experimental and Numerical Study on LCF Crack Propagation of Coiled Tubing Steel

Zhong

Zhao

WANG

et al. 2022

mech

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Coiled tubing (CT) is a joint-less long oil pipe that is wound around a reel and can be run and pulled continuously. Due to the particularity of the operating process, low-cycle fatigue (LCF) failure of the CT constitutes the main production cost. Aiming at the characteristics of small diameter and thin wall of CT, a single-edge-notched (SEN) arc specimen was designed and machined. LCF tests were conducted with force-controlled mode. Cyclic softening of the CT steel was presented and crack growing rates were measured. Meanwhile, finite element simulation was carried out to obtain the relationships among J-integral, crack size and load. Based on the experimental and numerical results, the speed of the LCF crack growth of the CT steel is expressed as an explicit function of the J-integral. It provides a basis for predicting the LCF life of the CT under working conditions from the perspective of crack propagation.

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