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Experimental investigation on strength of sandstone weathered and absorbed water heavily and its constitutivelaw

Zou Chong,Lei Shengyou,Yue Xijun,Song Yan,Gao Pan

Strategic Study of CAE 2011, Volume 13, Issue 1,   Pages 74-80

Abstract:

According to the feature of sandstone weathered and absorbed water heavily, the authors analyzed the physical and mechanical properties and chemical composition of the sandstone experimentally, then studied influence of blasting disturbance, water content, sample bedding on stress-strain strength characteristics through uniaxial and triaxial compression tests, and found that the sandstone would become weak in the strength when it absorbed water, and its cohesion decreased and showed significant anisotropy while friction angle was not changed. After the sandstone underwent blasting, its uniaxial compressive resistance and elastic modulus decreased, and Poisson ratio increased. As the sandstone has obvious bedding properties, the strengths of sample obtained from two different loading irections are different obviously. Based on the stress-strain curves from the triaxial tests, the authors found the stress-strain curves could be described well by the modified Duncan-Zhang model.

Keywords: sandstone     water content     strength     disturbed by blasting     bedding     constitutive law    

Research on the Quasi-static and Dynamic Properties and Constitutive Relation of Carbon Fiber-reinforced

Zhang Tai,Wang Xiaojun,Wang Zhihai,Guo Yang,Wang Yuanbo

Strategic Study of CAE 2006, Volume 8, Issue 5,   Pages 63-68

Abstract: A new nonlinear viscoelastic constitutive model is proposed and the coefficients in the constitutiveThe influence of temperature on the constitutive equation is remarkable, and its effects can be describedmaterial to reducing strain rate and raising temperature are similar, the time-temperature equivalent law

Keywords: carbon fiber-reinforced phenolic composite     dynamic properties     viscoelasticity     constitutive model     time-temperatureequivalent law    

Development of a constitutive model for rockfills and similar granular materials based on the disturbed

Mehdi VEISKARAMI, Ali GHORBANI, Mohammadreza ALAVIPOUR

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 4,   Pages 365-378 doi: 10.1007/s11709-012-0178-2

Abstract: curve shows an elasto-plastic behavior which suggests using the disturbed state concept to develop a constitutiveThe presented constitutive model complies reasonably with the experimental data.

Keywords: constitutive model     granular material     rockfill     plasticity     disturbed state concept     stress level    

Hypoplastic constitutive modeling of wetting deformation of weathered rockfill materials

Erich BAUER, Zhongzhi FU, Sihong LIU,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 1,   Pages 78-91 doi: 10.1007/s11709-010-0011-8

Abstract: wetting deformations for high earth and rockfill dams is a strong motivation to establish a suitable constitutiveRecently, the hypoplastic constitutive model by Gudehus and Bauer was extended by introducing solid hardnessFinally, the constitutive model proposed is used to study the influence of a degradation of the solid

Keywords: rockfill dams     weathered granular materials     hypoplasticity     solid hardness     creep     stress relaxation    

Numerical modeling of nonlinear deformation of polymer composites based on hyperelastic constitutivelaw

Qingsheng YANG, Fang XU

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3,   Pages 284-288 doi: 10.1007/s11465-009-0067-0

Abstract: polymer composites using a micromechanical model and finite deformation theory based on the hyperelastic constitutivelaw.

Keywords: composites     hyperelastic     finite deformation     homogenization     micromechanics    

Deriving Improved Newton's Second Law and the Law of Gravity at One Time with Form of Fractal Formula

Fu Yuhua

Strategic Study of CAE 2003, Volume 5, Issue 6,   Pages 55-58

Abstract:

Newton's second law and the law of gravity are summarized with experimental results.For discussing the possibility of deriving the two laws theoretically, according to the law of conservationof energy, the method of deriving improved Newton's second law and the law of gravity at one timeresults suitable for this example with the constant dimension fractal form are as follows: improved lawof gravity F = - GMm/r1.99989 , and improved Newton's second law F = ma1.01458

Keywords: Newton & acute     s second law     the law of gravity     theoretical derivation    

Improving existing “reaching law” for better discrete control of seismically-excited building structures

Zhijun LI, Zichen DENG

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 111-116 doi: 10.1007/s11709-009-0022-5

Abstract: In this paper, a novel “composite reaching law” was explained in details: 1) the equation of discreteThe results of numerical example analysis of the model show that the control law can effectively reduce

Keywords: discrete-time variable structure control     composite reaching law     chattering effect     saturated control law    

How did Archimedes discover the law of buoyancy by experiment?

Hidetaka KUROKI

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 1,   Pages 26-32 doi: 10.1007/s11465-016-0368-z

Abstract: water measurement of golden crown is impossible, and at his Eureka moment, Archimedes discovered the lawHe did not find the law of buoyancy but rather specific gravity of things at the moment.Through these measurements, he reached the discovery of the law of buoyancy directly by experiment.

Keywords: Archimedes’ principle     buoyancy     specific gravity     Eureka     Vitruvius     displaced water     balance     floating body    

Damage-constitutive model for seawater coral concrete using different stirrup confinements subjected

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 3,   Pages 429-447 doi: 10.1007/s11709-022-0913-2

Abstract: Moreover, a damage-constitutive model of CAC considering the lateral stress was set up based on damageThe lateral stress model showed a good agreement with the experimental data, and the proposed damage-constitutive

Keywords: concrete     stress−strain curves     lateral effective stress     peak stress     axial−lateral curves     damage-constitutive    

China’s Ministry of Environmental Protection Adopted Draft Amendment to the Law on Prevention and Control

Fu Sun,Yi Liu

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 6, doi: 10.1007/s11783-016-0890-6

Why does environmental compliance cost more than penalty? —A legal analysis on environmental acts of enterprises in China

DONG Hongwei

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 4,   Pages 434-442 doi: 10.1007/s11783-007-0069-2

Abstract: In the environmental protection field of China, due to lower law-breaking cost but higher law-abidingcost , it is a common case that the enterprise chooses to break through the law on purpose.

Keywords: law-abiding     punishment     environmental protection     law-breaking     enterprise    

Endochronic damage constitutive model for fully-graded aggregate mass concrete

SONG Yupu, WANG Huailiang

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 274-280 doi: 10.1007/s11709-007-0035-x

Abstract: endochronic theory with damage mechanics and on the quantities of experimental data, an endochronic damage constitutive

Keywords: concept     surface     design     concern     strength    

Enforcing the revised law on energy conservation and promoting the work of energy conservation

Fu Zhihuan

Strategic Study of CAE 2008, Volume 10, Issue 12,   Pages 13-16

Abstract: fast and its utilizing efficiency is low, which is an issue standing out relatively, thus the prior lawwhole society, the Standing Committee of National People's Congress enacted the amendment of the lawThis article introduces the fundamental conceptions and main contents of the revised law, together with

Keywords: law     energy     conservation    

First law-based thermodynamic analysis on Kalina cycle

ZHANG Ying, HE Maogang, JIA Zhen, LIU Xun

Frontiers in Energy 2008, Volume 2, Issue 2,   Pages 145-151 doi: 10.1007/s11708-008-0021-6

Abstract: Based on the first law of thermodynamics, and adopting the Peng-Robinson equation (P-R equation) as the

Keywords: ammonia-water     P-R     single-stage distillation     Peng-Robinson     pressure    

Unified description of sand behavior

Feng ZHANG, Bin YE, Guanlin YE

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 2,   Pages 121-150 doi: 10.1007/s11709-011-0104-z

Abstract: In this paper, the mechanical behavior of sand, was systematically described and modeled with a elastoplastic model proposed by Zhang et al. [ ]. Without losing the generality of the sand, a specific sand called as Toyoura sand, a typical clean sand found in Japan, has been discussed in detail. In the model, the results of conventional triaxial tests of the sand under different loading and drainage conditions were simulated with a fixed set of material parameters. The model only employs eight parameters among which five parameters are the same as those used in Cam-clay model. Once the parameters are determined with the conventional drained triaxial compression tests and undrained triaxial cyclic loading tests, then they are fixed to uniquely describe the overall mechanical behaviors of the Toyoura sand, without changing the values of the eight parameters irrespective of what kind of the loadings or the drainage conditions may be. The capability of the model is discussed in a theoretical way.

Keywords: constitutive model     sand     stress-induced anisotropy     density     structure    

Title Author Date Type Operation

Experimental investigation on strength of sandstone weathered and absorbed water heavily and its constitutivelaw

Zou Chong,Lei Shengyou,Yue Xijun,Song Yan,Gao Pan

Journal Article

Research on the Quasi-static and Dynamic Properties and Constitutive Relation of Carbon Fiber-reinforced

Zhang Tai,Wang Xiaojun,Wang Zhihai,Guo Yang,Wang Yuanbo

Journal Article

Development of a constitutive model for rockfills and similar granular materials based on the disturbed

Mehdi VEISKARAMI, Ali GHORBANI, Mohammadreza ALAVIPOUR

Journal Article

Hypoplastic constitutive modeling of wetting deformation of weathered rockfill materials

Erich BAUER, Zhongzhi FU, Sihong LIU,

Journal Article

Numerical modeling of nonlinear deformation of polymer composites based on hyperelastic constitutivelaw

Qingsheng YANG, Fang XU

Journal Article

Deriving Improved Newton's Second Law and the Law of Gravity at One Time with Form of Fractal Formula

Fu Yuhua

Journal Article

Improving existing “reaching law” for better discrete control of seismically-excited building structures

Zhijun LI, Zichen DENG

Journal Article

How did Archimedes discover the law of buoyancy by experiment?

Hidetaka KUROKI

Journal Article

Damage-constitutive model for seawater coral concrete using different stirrup confinements subjected

Journal Article

China’s Ministry of Environmental Protection Adopted Draft Amendment to the Law on Prevention and Control

Fu Sun,Yi Liu

Journal Article

Why does environmental compliance cost more than penalty? —A legal analysis on environmental acts of enterprises in China

DONG Hongwei

Journal Article

Endochronic damage constitutive model for fully-graded aggregate mass concrete

SONG Yupu, WANG Huailiang

Journal Article

Enforcing the revised law on energy conservation and promoting the work of energy conservation

Fu Zhihuan

Journal Article

First law-based thermodynamic analysis on Kalina cycle

ZHANG Ying, HE Maogang, JIA Zhen, LIU Xun

Journal Article

Unified description of sand behavior

Feng ZHANG, Bin YE, Guanlin YE

Journal Article