M. Pankow¹, A.M. Waas², C.F. Yen³

CMC-Computers, Materials & Continua, Vol.32, No.2, pp. 81-106, 2012, DOI:10.3970/cmc.2012.032.081

Abstract The compression response of 3D woven textile composites (3DWC) that consist of glass fiber tows and a polymer matrix material is studied using a combination of experiments and finite element based analyses. A previous study reported by the authors consisted of an experimental investigation of 3DWC under high strain rate loading, Pankow, Salvi, Waas, Yen, and Ghiorse (2011). Those experimental results were explained by using the finite element method to analyze the high rate deformation response of representative volume elements (RVEs) of the 3DWC, Pankow, Waas, Yen, and Ghiorse (2012). In this paper, the same More >

A. Ramachandra Murthy¹, Nagesh R. Iyer¹, B.K. Raghu Prasad²

CMC-Computers, Materials & Continua, Vol.31, No.3, pp. 229-252, 2012, DOI:10.3970/cmc.2012.031.229

Abstract This paper presents the advanced analytical methodologies such as Double- G and Double - K models for fracture analysis of concrete specimens made up of high strength concrete (HSC, HSC1) and ultra high strength concrete. Brief details about characterization and experimentation of HSC, HSC1 and UHSC have been provided. Double-G model is based on energy concept and couples the Griffith's brittle fracture theory with the bridging softening property of concrete. The double-K fracture model is based on stress intensity factor approach. Various fracture parameters such as cohesive fracture toughness (K_Ic^c), unstable fracture toughness (K_Ic^un) and… More >

A. Ramachandra Murthy¹, Nagesh R. Iyer¹, B.K. Raghu Prasad²

CMC-Computers, Materials & Continua, Vol.30, No.2, pp. 177-194, 2012, DOI:10.3970/cmc.2012.030.177

Abstract This paper presents the details of nonlinear finite element analysis (FEA) of three point bending specimens made up of high strength concrete (HSC, HSC1) and ultra high strength concrete (UHSC). Brief details about characterization and experimentation of HSC, HSC1 and UHSC have been provided. Cracking strength criterion has been used for simulation of crack propagation by conducting nonlinear FEA. The description about FEA using crack strength criterion has been outlined. Bi-linear tension softening relation has been used for modeling the cohesive stresses ahead of the crack tip. Numerical studies have been carried out on fracture More >

Raghvendra Khedle¹, D.P.Mondal², S.N.Verma¹, Sanjay Panthi²

CMC-Computers, Materials & Continua, Vol.27, No.3, pp. 211-230, 2012, DOI:10.3970/cmc.2011.027.211

Abstract The interface in aluminum cenosphere syntactic foam (ACSF) is modeled using FEM to study its deformation behaviour as a function of interface characteristics such as interface stiffness and thickness. The interface is modeled as a thin layer of object. The effective modulus and stress of ACSF examined when it contain 50% cenosphere by volume. In this study, the shell wall thickness of cenosphere is fixed at 1µm. The width of the interface varies from 0.2% to 0.6% of cenosphere volume fraction. The interface strength and modulus varies in the range of 10 to 50% of the More >

Smitha Gopinath^1,2, A. Ramachandra Murthy¹, Bhaskar Srivastava¹, V. Ramesh kumar¹, Nagesh R. Iyer¹

CMC-Computers, Materials & Continua, Vol.27, No.1, pp. 73-100, 2012, DOI:10.3970/cmc.2012.027.073

Abstract The present study investigates the behavior of concrete specimens confined with woven roving glass fabrics under uniaxial compression. The fabric made up of 360G.S.M. woven roved E-glass is embedded in a polyester resin before application. Experimental investigations have been carried out on confined and unconfined concrete specimens of size 150 mm (diameter) X 300 mm (height) under a displacement controlled loading. The effect of number of layers on confinement has also been investigated. Load versus deflection plots have been obtained for all the specimens. Numerical studies have been performed on the confinement effect of the… More >

A. Ramachandra Murthy¹, Nagesh R. Iyer¹, B.K. Raghu Prasad²

CMES-Computer Modeling in Engineering & Sciences, Vol.89, No.6, pp. 459-480, 2012, DOI:10.3970/cmes.2012.089.459

Abstract This paper presents the details of crack growth study and remaining life assessment of concrete specimens made up of high strength concrete (HSC, HSC1) and ultra high strength concrete (UHSC). Flexural fatigue tests have been conducted on HSC, HSC1 and UHSC beams under constant amplitude loading with a stress ratio of 0.2. It is observed from the studies that (i) the failure patterns of HSC1 and UHSC beams indicate their ductility as the member was intact till the crack propagated up to 90% of the beam depth and (ii) the remaining life decreases with increase… More >

Mark Andrew Bradford¹, Yong-Lin Pi¹

CMES-Computer Modeling in Engineering & Sciences, Vol.89, No.5, pp. 389-416, 2012, DOI:10.3970/cmes.2012.089.389

Abstract This paper is devoted to the development of a finite composite beam element for the nonlinear elastic-plastic analysis of composite high strength steel and geopolymer concrete members. For this, geometric nonlinearity is derived using a special orthogonal rotation matrix, so that scalar product of vectors is preserved during rotation from the initial configuration to a deformed configuration and rigid body movements are excluded from the finite strains. The material nonlinearities of the geopolymer concrete are based on constitutive models in association with its axial stress-strain relationship that is consistent with the experimental results. To consider… More >

Cheng Yan, Zhuo-Cheng Oui?a, Zhuo-Ping Duan, Feng-Lei Huang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.3, pp. 83-84, 2011, DOI:10.3970/icces.2011.018.083

Abstract Dynamic behaviors of tensile strength of brittle materials are investigated analytically, and an explicit mathematical expression for the dynamic tensile strength under a quadratic boundary loading is derived, together with the so-called structural-temporal failure criterion. The analytical solution shows reasonably good agreement with the previous dynamic experimental data. Moreover, it is shown by using the explicit expression that the dynamic tensile strength of brittle materials can be determined completely by the quasistatic material parameters such as the quasistatic tensile strength, material density and the incubation-time, which implies that the so-called strain-rate effect on the strength More >

Hang Lin, Ping Cao, Jiangteng Li

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.3, pp. 95-96, 2011, DOI:10.3970/icces.2011.020.095

Abstract The cohesion c and friction angle I are the shear strength parameters influencing the stability of slope. Any of them changes, the factor of safety of slope will change, many work has been done on the relationship between shear strength parameters and factor of safety, but it has seldom been considered in the literature how the slip surface changes at the same time. In the present paper, the strength reduction method is used to find out the effect of shear strength parameters c and Phi to the distribution of slip surface. The study shows that, More >

Sang Jin Kim, Dae Hyun Kim, Du Chan Kim, Jung Min Sohn, Jung KwanSeo, Bong Ju Kim, Jeom Kee Paik, S.N. Atluri

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 71-72, 2011, DOI:10.3970/icces.2011.019.071

Abstract The movement of various cargos is needed due to rise of global container traffics. Ships are ideal vehicles for transportation and have many construction types such as container ship, bulk carrier, oil tanker, and car carrier. Ships like these are serviced all over the world. Ships are subjected to various environmental loads during operation. To sustain these various loads, ships should be designed guaranteeing structural safety and economical efficiency as well.
Stiffened panels consist of plates and supporting members and are commonly used in the ship building and ocean engineering industry. Ship structures are normally… More >