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Stress Waves (stress + wave)

Distribution by Scientific Domains

Engineering	100%

Selected Abstracts

TRANSIENT STRESS WAVES IN STUDY OF COCONUT PHYSICAL PROPERTIES

EXPERIMENTAL TECHNIQUES, Issue 1 2010
J. Trnka
First page of article [source]

Nonlinear SEM numerical analyses of dry dense sand specimens under rapid and dynamic loading

INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, Issue 6 2007
C. di Prisco
Abstract The paper mainly concerns the mechanical response of 2D dry dense sand specimens under shock loading. The problem is numerically analysed by means of a SEM dynamic code, within which an already conceived non-local viscoplastic constitutive model characterized by a non-associated flow rule and by an anisotropic strain hardening has been implemented. In particular the strain localization and time dependency of the material mechanical response are taken into consideration. Both rapid/static loading and dynamic histories are numerically simulated. In the first case, the time dependency of the material mechanical response can be captured by neglecting inertial effects, while in the second one the two factors are superimposed and the propagation of the stress waves within the specimen is discussed. The interest of these analyses derives from the fact that the diffusion phenomenon takes place within a specimen already localized. Copyright © 2006 John Wiley & Sons, Ltd. [source]

Smoothed nodal forces for improved dynamic crack propagation modeling in XFEM

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 1 2010
Thomas Menouillard
Abstract Improvements in numerical aspects of dynamic crack propagation procedures by the extended finite element method are described and studied. Using only the discontinuous enrichment function in XFEM gives a binary description of the crack tip element: it is either cut or not. We describe a correction force to modify the forces to smoothly release the tip element while the crack tip travels through the element. This avoids creating spurious stress waves and improves the accuracy of the stress intensity factors during propagation by decreasing the oscillations. Copyright © 2010 John Wiley & Sons, Ltd. [source]

A non-reflecting layer method for non-linear wave-type equations on unbounded domains with applications to shape memory alloy rods

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 15 2005
M. Newman
Abstract In this paper a new technique is introduced and applied in solving one-dimensional linear and non-linear wave-type equations on an unbounded spatial domain. This new technique referred to as the non-reflecting layer method (NRLM) extends the computational domain with an artificial layer on which a one-way wave equation is solved. The method will be applied to compute stress waves in long rods consisting of NiTi shape memory alloy material subjected to impact loading and undergoing detwinning and pseudo-elastic material responses. The NRLM has been tested on model problems and it has been found that the computed solutions agree well with the exact solutions, i.e. normalized error levels are in ranges acceptable for engineering computations. Copyright © 2005 John Wiley & Sons, Ltd. [source]