Open Access

ARTICLE

A. Shimamoto¹, C. C. Lee², Y. Furuya³
Structural Longevity, Vol.8, No.2, pp. 71-81, 2012, DOI:10.3970/sl.2012.008.071
Abstract The TiNi fiber reinforced / PC composite material was developed, and shape memory effect, which would prevent fatigue crack growth, of the material was investigated through fatigue experiments. The fatigue behavior and crack propagation were observed under various temperature in the SEM servopulser, which is a fatigue testing instrument with scanning electron microscope. The results showed the effectiveness of fatigue resistance. The shape memory effect and expansion behavior of the matrix caused by increasing temperature created the fatigue crack propagation control mechanism. It was verified that the controlling of fatigue crack growth was attributed to the compressive stress field in… More >

View

496

Download

297

Open Access

ARTICLE

E.E. Theotokoglou¹, E. Sideridis¹
Structural Longevity, Vol.8, No.2, pp. 83-97, 2012, DOI:10.3970/sl.2012.008.083
Abstract In this work a class a particle reinforced polymers have been investigated using nondestructive and destructive techniques. The velocities cl and ct of the longitudinal and transverse waves were evaluated using ultrasounds. From these and from the density of the material the modulus of elasticity, the shear modulus and the Poisson ratio were calculated by the appropriate relationships. The results were compared with those obtained from destructive tensile experiments and as well as with those derived from theoretical formulae. Also, their attenuation coefficient α and damage parameter D were obtained and an attempt was made to establish a relationship between… More >

View

434

Download

405

Open Access

ARTICLE

Y. C. Shiah¹, C. L. Tan²
Structural Longevity, Vol.8, No.2, pp. 99-107, 2012, DOI:10.3970/sl.2012.008.099
Abstract In BEM analysis of generally anisotropic solids, the additional volume integral associated with thermal effects that appears in the direct formulation of the boundary integral equation (BIE) has hitherto been successfully transformed in an analytically exact fashion into surface ones only for two-dimensions (2D), and not for the three-dimensional (3D) case. This is due to the mathematical complexity of the Green’s function and its derivatives for the 3D solid. The presence of the domain integral destroys the distinctive feature of the boundary element method (BEM) as a truly boundary solution numerical analysis tool. As a precursor to treating this problem… More >

View

415

Download

366

Open Access

ARTICLE

F. Dufour¹, N. Prime¹, F. Darve¹
Structural Longevity, Vol.8, No.2, pp. 109-115, 2012, DOI:10.3970/sl.2012.008.109
Abstract In this contribution, an original constitutive model is proposed to describe, within a unique framework, the initiation, the propagation and the arrest phases of landslides. The model is built such that it is enable to model in one hand a stable stage with an elasto-plastic behaviour, and in another hand a viscous dominated behaviour. The transition between the two behaviours is performed by means of the second order work stability criterion. This model is applied for an undrained triaxial test, in which the stress invariant consistently falls after the transition. More >

View

375

Download

359

Open Access

ARTICLE

S. Parvanova¹, P. Dineva², G. Manolis³
Structural Longevity, Vol.8, No.2, pp. 117-123, 2012, DOI:10.3970/sl.2012.008.117
Abstract The aim of the present study is to develop and validate an efficient boundary element method approach for solution of in-plane, time-harmonic problems in elastodynamics that involve finite elastic solids weakened by holes of different shapes. The modeling approach is within the framework of continuum mechanics and linear wave propagation theory. The results obtained show a sensitivity of both the dynamic stress concentration factor and the scattered wave field that develop in the finite solid to defect geometry, to wave interaction with the holes and to multiple hole interaction. More >

View

401

Download

374

Open Access

ARTICLE

Marjan Uddin¹, Ghulam Kassem¹
Structural Longevity, Vol.8, No.2, pp. 125-137, 2012, DOI:10.3970/sl.2012.008.125
Abstract An interpolation method using radial basis functions is applied for the numerical solution of good Boussinesq equation. The numerical method is based on scattered data interpolation along with basis functions known as radial basis functions. The spatial derivatives are approximated by the derivatives of interpolation and a low order scheme is used to approximate the temporal derivative. The scheme is tested for single soliton and two soliton interaction. The results obtained from the method are compared with the exact solutions and the earlier works. More >

View

512

Download

370