Results 41 to 50 of about 45,082 (299)
An accelerated springback compensation method for creep age forming [PDF]
The International Journal of Advanced Manufacturing Technology, 2018 Springback compensation is essential for tool design in creep age forming (CAF) process. In this study, a new accelerated springback compensation method integrating springback mechanism of a plate with creep-ageing behaviour of materials has been developed for CAF tool design to manufacture both singly and varyingly curved products.
Li, Y +5 more
openaire +3 more sources
Analysis of an improved Nishihara creep model considering plastic strain accumulation
Frontiers in Materials, 2023 Rock-engineering structures, particularly subway excavation rock-engineering structures, are subjected to the long-term effects of external loading that may gradually damage and cause creep and severe plastic deformations or even progressive failure. The
Yang Cheng, Liangliang Zhang
doaj +1 more source
Non-stationary Nishihara model in the particle flow code
工程科学学报, 2015 In order to accurately simulate the whole process of rock creep and explore the generation and development of mircofractures from the meso-level,a visco-elastoplastic Nishihara rheological constitutive model is developed in the two-dimensional particle ...
YANG Zhen-wei +4 more
doaj +1 more source
A Nonlinear Creep-damage Constitutive Model of Mudstone Based on the Fractional Calculus Theory [PDF]
Journal of Petroleum Science and Technology, 2017 During the flood development in an oil field, the creep characteristic of mudstone is one of the important factors causing casing damage. In this study, based on the theory of fractional order differential and taking into account the creep damage ...
Zhang Jun, Zeng Jia
doaj +1 more source
Creep rupture of materials: insights from a fiber bundle model with relaxation
, 2010 I adapted a model recently introduced in the context of seismic phenomena, to study creep rupture of materials. It consists of linear elastic fibers that interact in an equal load sharing scheme, complemented with a local viscoelastic relaxation ...
E. A. Jagla, H. Kawamura, K. Yamaguchi
core +1 more source
A new engineering approach to predict the hydrostatic strength of uPVC\ud pipes [PDF]
, 2007 Extruded unplasticised Poly(Vinyl Chloride) (uPVC) pipes are certified using pressurised pipe tests.\ud During these tests the pipes are subjected to a certain temperature and internal pressure, while the\ud time-to-failure, the time at which the ...
Bor, T.C. +3 more
core +7 more sources
Scientific Reports, 2022 Mud shale, used in drilling engineering, is prone to hydration and expansion, resulting in creep deformation that leads to wellbore shrinkage and pipe sticking incidents.
Xinxin Fang +3 more
doaj +1 more source
Scientific ReportsOn the basis of the law of conservation of energy, the three stages of rock creep are analyzed. The reasons for the difficulty in studying the accelerated creep stage of rocks using the traditional creep model are expounded.
Di Zhou +9 more
doaj +1 more source
Study on the Nonlinear Damage Creep Model of the Weak Interlayer
Advances in Civil Engineering, 2022 The weak interlayer has become a weak link in slope engineering due to its rheological effect. It is of great significance to study the nonlinear creep model of weak interlayer for long-term stability of the slope. In this paper, based on the creep curve
Erjian Wei +6 more
doaj +1 more source
The newfound relationship between extrachromosomal DNAs and excised signal circles
FEBS Letters, EarlyView.Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley +1 more source