Results 81 to 90 of about 7,360 (301)

Study on the failure mechanism of the shield excavation face in the sandy cobble stratum under different buried depths

Deep Underground Science and Engineering, EarlyView.
Abstract One of the significant challenges faced in shield tunnel construction is the risk of collapse resulting from abrupt changes in soil conditions in advance of the working face, particularly within the sandy cobble stratum. This study aims to effectively manage these sudden variations and to further investigate the failure mechanisms associated ...
Hua Jiang, Chongyang Liu, Ao Zhang, Xiaoyan Zhang, Yuhang Li   +4 more
wiley   +1 more source

CONSTITUTIVE MODEL AND FAILURE PARAMETERS OF TC4 TITANIUM ALLOY UNDER QUASI-STATIC TENSILE

Jixie qiangdu, 2022
Large deformation and fracture processes of materials are often involved in the finite element simulation of high-speed collision. Based on the Johnson-Cook fracture failure model, TC4 titanium alloy samples with different notch sizes were designed, and ...
FANG XinWen, GUAN JiaJia
doaj  

Ubiquitiformal Fracture Energy under Triaxial Compression Incorporating Stress Triaxiality

Rock Mechanics Letters
Most studies on ubiquitiformal fracture energy focus on tensile loading, whereas rock materials in engineering practice are predominantly subjected to compressive and confining stresses. In this paper, the complexity and the upper and lower bound to scale invariance are introduced into the expression of the fracture parameters, and a theoretical ...
Beibei Yang, Zijian Yan, Yongdong Yang, Xiaogang Ding, Yunxiu Dong   +4 more
openaire   +1 more source

Effect of confining pressure on fracture characteristics and mineralogical behavior of tight sandstone specimens after hydraulic fracturing

Deep Underground Science and Engineering, EarlyView.
Hydraulic fracturing in tight sandstone and fracture propagation characteristics using backscattered electron‐scanning electron microscope (BSE‐SEM) images. Abstract This study focuses on hydraulic fracturing experiments conducted under triaxial conditions on tight sandstone specimens from Shivpuri district, Madhya Pradesh, India.
Pankaj Rawat, Narendra Kumar Samadhiya
wiley   +1 more source

Quadrupole Pairing Interaction and Signature Inversion [PDF]

, 1999
The signature inversion in the \pi h11/2 \otimes \nu h11/2 rotational bands of odd-odd Cs and La isotopes and the \pi h11/2 \otimes \nu i13/2 bands of odd-odd Tb, Ho and Tm nuclei is investigated using pairing and deformation self consistent mean field ...
Bark, Bengtsson, Bengtsson, Cederwall, Cohen, Drissi, F.R Xu, Frauendorf, Godfrey, Goodman, Hamamoto, Hamamoto, Hamamoto, Hamamoto, Hara, Hayakawa, Helmer, Helmer, Ikeda, Inglis, Inglis, Komatsubara, Liu, Liu, Matsuzaki, Matsuzaki, Möller, Nazarewicz, Nyako, Oliveira, Oliveria, Paul, Paul, Pradhan, R Wyss, Sakamoto, Sala, Salicio, Satuła, Satuła, Satuła, Satuła, Satuła, Stephens, Strutinsky, Strutinsky, Tajima, W Satuła, Wyss, Wyss, Xu, Ćwiok   +51 more
core   +2 more sources

Creep properties and constitutive model of diabase in deep water conveyance tunnels

Deep Underground Science and Engineering, EarlyView.
The axial and lateral creep characteristics of diabase were analyzed based on compression creep tests. The nonlinear viscoelastic‐plastic model capable of describing the whole creep process was established based on the fractional derivative and damage theories.
Zhigang Tao, Pengxiao Guan, Xiaojie Yang, Keyuan Liu, Mingjiu Cai, Hong Yang   +5 more
wiley   +1 more source

Stress triaxiality and failure in SFRPs: a novel workflow for failure curve determination, considering fibre orientation and specimen geometry

Polymer Testing
This research investigates the static failure behaviour of a PA6T/6I GF50, focusing on the distribution of the stress triaxiality at critical points where failure is expected.
F.E. Fiorini, A. Canegrati, L.M. Martulli, P. Steck, A. Bernasconi   +4 more
doaj   +1 more source

Comparison of gurson and lemaitre model in the context of blanking simulation of a high strength steel [PDF]

, 2017
The process of blanking takes place in a short band with high accumulated strain undergoing various stress triaxialities. Enhanced implementations for shear and compressive loads of Gurson’s and Lemaitre’s model are directly compared for the same ...
Clausmeyer, Till, Gutknecht, Florian, Isik, Kerim, Tekkaya, Erman   +3 more
core  

Failure characteristics and the energy criterion of rock with a through‐going joint under true‐triaxial unloading conditions: Insights from the DEM model

Deep Underground Science and Engineering, EarlyView.
The rock failure mode is significantly influenced by the contributing factors, such as the joint inclination, the initial confining pressure, and the unloading point. We found six typical rock failure modes after a large number of numerical tests. Abstract Excavation unloading damages rock masses, with preferential failure along geological defects in ...
Fei Liu, Changhui Liang, Sijia Liu, Yongjun Zhang, Luo Wang   +4 more
wiley   +1 more source

A review on rockburst prediction and prevention to shape an ontology‐based framework for better decision‐making for underground excavations

Deep Underground Science and Engineering, EarlyView.
A scientometric analysis of 2449 journal articles and a comprehensive review of 336 papers were conducted, discussing and identifying challenges and research gaps in rockburst prediction and prevention and proposing an ontology‐based framework for better decision‐making in underground excavations. Abstract With underground engineering projects becoming
Hongchuan Yan, Haijiang Li, Hongqiang Xie, Mingli Xiao, Jianliang Pei, Huaizhong Liu, Jiangda He   +6 more
wiley   +1 more source