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基于在位力热同步实验装置的动态断裂起裂机理研究
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作者 刘伟 李隆康 +6 位作者 杨恒 陈满喜 伊凯 齐伟 朱盛鑫 曾庆磊 陈浩森 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2023年第8期1-8,共8页
作为一种典型的失效行为,动态断裂对于材料安全评估和设计至关重要,而动态断裂的瞬时性给实验表征裂纹尖端局部温度场演化带来了巨大挑战.研究人员指出温度对断裂韧性有显著影响,但在动态断裂起裂过程中,温度升高和裂纹尖端区域热软化... 作为一种典型的失效行为,动态断裂对于材料安全评估和设计至关重要,而动态断裂的瞬时性给实验表征裂纹尖端局部温度场演化带来了巨大挑战.研究人员指出温度对断裂韧性有显著影响,但在动态断裂起裂过程中,温度升高和裂纹尖端区域热软化效应的作用仍需阐明.本工作旨在评估温升效应对TC4(Ti-6Al-4V)合金受冲击动态断裂起裂的影响.我们开发了一种力/热耦合在位测试装置,获得了高时间/空间分辨率的动态I型断裂的同步COD(裂纹尖端张开位移)和温度场演化过程,并进行了相应的模拟,分析了动态断裂起裂时的热软化效应的作用.对于TC4合金,起裂时刻测得的最高温度约为130,热效应对材料性能的影响较小.本工作的结果为研究金属的力/热耦合断裂行为提供了数据支持. 展开更多
关键词 热软化效应 TC4合金 裂纹尖端张开位移 动态断裂 温升效应 热耦合 断裂韧性 失效行为
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XFEM modeling of hydraulic fracture in porous rocks with natural fractures 被引量:2
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作者 Tao Wang ZhanLi Liu +2 位作者 qinglei zeng Yue Gao Zhuo Zhuang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2017年第8期45-59,共15页
Hydraulic fracture (HF) in porous rocks is a complex multi-physics coupling process which involves fluid flow, diffusion and solid deformation. In this paper, the extended finite element method (XFEM) coupling wit... Hydraulic fracture (HF) in porous rocks is a complex multi-physics coupling process which involves fluid flow, diffusion and solid deformation. In this paper, the extended finite element method (XFEM) coupling with Biot theory is developed to study the HF in permeable rocks with natural fractures (NFs). In the recent XFEM based computational HF models, the fluid flow in fractures and interstitials of the porous media are mostly solved separately, which brings difficulties in dealing with complex fracture morphology. In our new model the fluid flow is solved in a unified framework by considering the fractures as a kind of special porous media and introducing Poiseuille-type flow inside them instead of Darcy-type flow. The most advantage is that it is very convenient to deal with fluid flow inside the complex frac^xre network, which is important in shale gas extraction. The weak formulation for the new coupled model is derived based on virtual work principle, which includes the XFEM formulation for multiple fractures and fractures intersection in porous media and finite element formulation for the unified fluid flow. Then the plane strain Kristianovic-Geertsma-de Klerk (KGD) model and the fluid flow inside the fracture network are simulated to validate the accuracy and applicability of this method. The numerical results show that large injection rate, low rock permeability and isotropic in-situ stresses tend to lead to a more uniform and productive fracture network. 展开更多
关键词 hydraulic fracture XFEM porous media fluid flow multi-physics coupling
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Compressive properties and energy absorption of BCC lattice structures with bio-inspired gradient design 被引量:1
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作者 Fuchao Gao qinglei zeng +2 位作者 Jing Wang zengfei Liu Jun Liang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2022年第1期110-122,共13页
Inspired by the gradient structure of the nature,two gradient lattice structures,i.e.,unidirectional gradient lattice(UGL)and bidirectional gradient lattice(BGL),are proposed based on the body-centered cubic(BCC)latti... Inspired by the gradient structure of the nature,two gradient lattice structures,i.e.,unidirectional gradient lattice(UGL)and bidirectional gradient lattice(BGL),are proposed based on the body-centered cubic(BCC)lattice to obtain specially designed mechanical behaviors,such as load-bearing and energy absorption capacities.First,a theoretical model is proposed to predict the initial stiffness of the gradient lattice structure under compressive loading,and validated against quasi-static compression tests and finite element models(FEMs).The deformation and failure mechanisms of the two structures are further studied based on experiments and simulations.The UGL structure exhibits a layer-by-layer failure mode,which avoids structure-wise shear failure in uniform structures.The BGL structure presents a symmetry deformation pattern,and the failure initiates at the weakest part.Finally,the energy absorption behaviors are also discussed.This study demonstrates the potential application of gradient lattice structures in load-transfer-path modification and energy absorption by topology design. 展开更多
关键词 Gradient lattice structure Quasi-static compression test Mechanical performance Finite element analysis Energy absorption
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Study on interaction between induced and natural fractures by extended finite element method
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作者 DanDan Xu ZhanLi Liu +2 位作者 Zhuo Zhuang qinglei zeng Tao Wang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2017年第2期24-37,共14页
Fracking is one of the kernel technologies in the remarkable shale gas revolution. The extended finite element method is used in this paper to numerically investigate the interaction between hydraulic and natural frac... Fracking is one of the kernel technologies in the remarkable shale gas revolution. The extended finite element method is used in this paper to numerically investigate the interaction between hydraulic and natural fractures, which is an important issue of the enigmatic fracture network formation in fracking. The criteria which control the opening of natural fracture and crossing of hydraulic fracture are tentatively presented. Influence factors on the interaction process are systematically analyzed, which include the approach angle, anisotropy of in-situ stress and fluid pressure profile. 展开更多
关键词 hydraulic fracturing natural fracture interaction criterion fluid pressure extended finite element method
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