Article
Mechanics
Enkai Dai, Zhiqin Lv, Panpan Yuan, Guoqiang Liu, Ning Guo, Zhe Liu, Bingtao Tang
Summary: The modified isotropic Mohr-Coulomb fracture model and the anisotropic MMC fracture model were developed and calibrated to predict the ductile fracture behavior of QP980 steel sheet. The anisotropic fracture loci were obtained in various loading directions and the influence of plastic anisotropy on ductile fracture behavior was confirmed. The anisotropic MMC fracture model was validated through different tests, demonstrating its capability to predict ductile fracture behavior under different loading conditions.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Geological
Nan Yao, Xingmin Deng, Binyu Luo, Felix Oppong, Pengcheng Li
Summary: Traditional grouting technology is improved by adding an expansion agent to the grouting material, which provides compressive stress to stabilize the rock mass. The study reveals the mechanism of grouting reinforcement on rock mass strength and the failure mode after grouting. Experimental tests and numerical simulations show that expansive slurry grouting enhances the strength of the slurry-rock mass composite, and the failure primarily occurs in the weakest component.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Dongshuai Tian, Hong Zheng
Summary: In this study, it is proposed to establish a Generalized Mohr-Coulomb (GMC) criterion, which relates the cohesion c and the frictional factor f to the coefficient of intermediate principal stress b, in order to avoid underestimating the loading capacity of foundations. True triaxial tests and stress tensor characteristic theory demonstrate that the failure surfaces in the stress space should be non-smooth per se for b = 0 or 1. Comparisons with other prominent failure criteria indicate that the GMC fits the test data best.
APPLIED SCIENCES-BASEL
(2023)
Article
Construction & Building Technology
Xiang Ding, Na Chen, Fan Zhang, Guangqing Zhang
Summary: Despite the lack of test data of the coefficient of pressure sensitivity alpha and the shearing cohesion k, this study presents experimentally calibrated strength parameters of the Drucker-Prager criterion for the first time, bridging the gap between its wide application and insufficient knowledge. The proposed method linearly fits the square root of the second invariant of the deviatoric stress tensor J2 with the first invariant of the stress tensor I1 in the stress space, enabling the calibration of parameters alpha and k in the Drucker-Prager criterion.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Mechanics
Naiyu Liu, Puhui Chen
Summary: The nonlinear Mohr failure criterion is re-evaluated in this paper. It is found that the polynomial failure criteria constructed by normal stress sigma n and shear stress tau n predict unreasonable fracture angles and are inconsistent with experimental observations under high hydrostatic compression. To overcome these problems, a transformation from principal stress space (sigma 1, sigma 3) to stress space (sigma n, tau n) is derived, and the present failure criterion predicts more reasonable failure angles and an envelope parallel to sigma n axis under high hydrostatic compression. Furthermore, the paper reveals that the fracture angle for brittle materials under uniaxial tension is not 0 degrees and under pure shear stress is not 45 degrees, contrary to common assumptions.
MECHANICS RESEARCH COMMUNICATIONS
(2023)
Article
Computer Science, Interdisciplinary Applications
Jiabing Zhang, Xiaohu Zhang, Wei Chen, Zhen Huang, Ronghuan Du
Summary: A constitutive model was developed to study the damage in transversely isotropic rock masses caused by freeze-thaw cycles. The model was verified by experimental results and accurately reflected the stress and strain evolution in the rock mass under different freeze-thaw cycles.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Environmental
Gianmarco Vallero, Monica Barbero, Fabrizio Barpi, Mauro Borri-Brunetto, Valerio De Biagi, Yoichi Ito, Satoru Yamaguchi
Summary: Within the field of snow mechanics, the shear strength of snow plays a key role in understanding the progressive shear failure of snow interfaces. However, research on the shear behavior at the contact between a snow layer and a solid stiff material is limited. Experimental direct shear tests under different conditions provide valuable insights into the shear strength of snow-mortar interfaces.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2022)
Article
Construction & Building Technology
Shibing Huang, Zekun Xin, Yuhang Ye, Fei Liu
Summary: A novel elastoplastic model based on the Mohr-Coulomb (M-C) yield criterion is proposed to quantify frost deformation in saturated brittle porous materials during repeated freeze-thaw cycles. Experimental results on sandstone and cement pastes validate the model, showing good agreement between calculated frost strain and experimental values. The freeze-thaw deformation can be divided into four typical stages, with the introduction of a plastic parameter η to estimate residual plastic strains caused by freeze-thaw action.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Jin Hyun Lee, Jae Hong Kim
Summary: The mix design of 3D printed concrete includes various binders and additives to improve its casting performance and shape stability. Matric suction affects the shape stability and strength characteristics of the concrete.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
Huihua Hu, Xing Zhang, Jianxin Qin, Hang Lin
Summary: This study investigates the influence of morphological characteristics on the shear mechanical properties of sawtooth joints through direct shear tests. The results show that the peak shear displacement of joints varies with increasing normal stress, and the shear strength of joints is positively correlated with normal stress. The study also establishes an empirical equation for the shear strength of joints considering the sawtooth angle. Furthermore, two modes of shear failure for serrated joints are identified. This research provides a theoretical reference for the prediction and prevention of geological disasters.
Article
Engineering, Civil
Iago Da Silva Santos, Diego F. B. Sarzosa, Marcelo Paredes
Summary: This work presents a framework for modeling ductile fracture and successfully predicts the onset of fracture and tearing response in pressurized metallic components. The numerical predictions are in good agreement with measured data, and detailed analyses of the strain capacity of defected pipes are performed.
THIN-WALLED STRUCTURES
(2022)
Article
Energy & Fuels
Sifei Liu, Peng Ma, Fanfei Meng, Tumelo K. M. Dintwe, Pisith Mao, Dyson Moses
Summary: The post-peak mechanical properties of gangue-containing coal samples were investigated, and a model of gangue distribution was established. A stress-strain model based on equivalent plastic strain was proposed, considering the effects of cohesive force and internal friction angle on strength. It was found that brittleness rapidly decreases as confining pressure rises.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Materials Science, Multidisciplinary
Chunguang Li, Cuihua Li, Rong Zhao, Lei Zhou
Summary: The investigated strength criterion provides a more suitable approach for describing the ultimate stress capacity of rocks, considering the intermediate principal stress sigma(2). The nonlinear parabolic form of the criterion on the meridian plane makes it more applicable in rock mechanics compared to the linear Mohr-Coulomb failure criterion. In numerical analysis, the present criterion shows higher efficiency and reliability in solving corner problems than Mohr-Coulomb and Hoek-Brown criteria.
MECHANICS OF MATERIALS
(2021)
Article
Engineering, Ocean
L. Cheng, M. S. Hossain, Y. Hu, Y. H. Kim, S. N. Ullah
Summary: This paper investigates the behavior of caisson anchors in sand of different densities and finds that failure is mainly influenced by sand relative density, mooring angle, and padeye position. Through parametric study, an optimal range of padeye position is identified to minimize the rotation angle of the caisson at failure.
APPLIED OCEAN RESEARCH
(2021)
Article
Engineering, Mechanical
Handong Liu, Jingjing Liu, Shiying Zhang, Lingyun Feng, Lei Qiu
Summary: To understand the impact of fracture on deformation and failure of soft rock, cement mortar specimens were used to simulate soft rock. Uniaxial and triaxial compression tests were conducted to study the stress-strain relationship and failure mode of fractured soft rock with different fracture angles and connectivity. A constitutive model and Mohr-Coulomb failure criterion for soft rock were established. The results showed that fractured soft rock had lower uniaxial compressive strength compared to intact soft rock. Fracture angles had significant effects on the failure mode, while the stress-strain curves remained similar.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
