A coupling method between phase field model and classical linear elastic theory model for static and dynamic fracture

Yu, Yuanfeng; Hou, Chi; Rabczuk, Timon; Zhao, Meiying

doi:10.1016/j.tafmec.2024.104432

Cited by 2 publications

(1 citation statement)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Mohr-Coulomb failure criterion was used in early finite element analysis, but later studies showed that the polygonal cone could not accurately reflect the failure surface of concrete. In terms of the constitutive relationship of concrete, scholars from various countries have proposed various models, such as those based on linear elastic theory [16], nonlinear elastic theory [17], elastic-plastic theory [18], internal time theory [19], viscoelas-tic theory [20] and viscoplastic theory [21]. However, due to the complex characteristics of concrete materials, there is no recognized theory that can be widely applied to concrete structures under various conditions.…”

Section: Introductionmentioning

confidence: 99%

Study on the Fracture of a Shield Segment in a Fully Excavated Hard Rock Section under the Influence of Construction Loads

Zhu,

Zheng,

Ren

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

In this paper, the initiation of the fracture of a segment caused by the pressure of the jack and other factors during shield construction is discussed. Based on the Rots model in the finite element software Diana 10.4, the fracture width is solved. Combined with in situ measurements, the mechanisms of concrete fracturing of a segment under external loads, such as the jack thrust deflection angle and uneven jack thrust caused by the changes in the segment due to the upward buoyancy and shield attitude, are studied; additionally, the occurrence conditions and engineering control measures for segment fracture are summarized. The results show that when the attitudes of the shield and segment are identical, the total thrust of the shield is recommended not to exceed 21,000 kN, and is strictly limited to 24,000 kN. When the attitude inclination angle between the shield machine and the segment is less than 1°, the impact on the segment quality is small. When the inclination angle reaches 2°, the total thrust of the shield is recommended not to exceed 16,000 kN, and is strictly limited to 18,000 kN. When the inclination reaches 3°, a fracture is easily produced. When the total thrust is 19,000 kN, it is recommended that the loading increase or decrease in the left and right four grippers should not exceed 20%, and they are prohibited to exceed 30%. The fracture width increases exponentially with the increase in misalignment between adjacent segment rings. These research results provide a theoretical basis for jack pressure control during shield construction.

show abstract