MedWorm.com provides a medical RSS filtering service. Over 6000 RSS medical sources are combined and output via different filters. This feed contains the latest items from the 'Journal of the Mechanics and Physics of Solids' source. Tue, 29 Nov 2011 09:30:37 +0100 http://www.medworm.com/index.php?rid=5415501&cid=s_37330_75_f&fid=37330&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D22081726%26dopt%3DAbstract Authors: Tepole AB, Ploch CJ, Wong J, Gosain AK, Kuhl E Abstract The goal of this manuscript is to establish a novel computational model for stretch-induced skin growth during tissue expansion. Tissue expansion is a common surgical procedure to grow extra skin for reconstructing birth defects, burn injuries, or cancerous breasts. To model skin growth within the framework of nonlinear continuum mechanics, we adopt the multiplicative decomposition of the deformation gradient into an elastic and a growth part. Within this concept, we characterize growth as an irreversible, stretch-driven, transversely isotropic process parameterized in terms of a single scalar-valued growth multiplier, the in-plane area growth. To discretize its evolution in time, we apply an unconditionally stable, i... Journal of the Mechanics and Physics of Solids journals http://www.medworm.com/rss/comments.php?id=5415501 Sat, 01 Oct 2011 04:00:00 +0100 5415501 http://www.medworm.com/index.php?rid=5243391&cid=s_37330_75_f&fid=37330&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21927506%26dopt%3DAbstract Authors: Chen H, Liu Y, Zhao X, Lanir Y, Kassab GS Abstract Biological tissues have unique mechanical properties due to the wavy fibrous collagen and elastin microstructure. In inflation, a vessel easily distends under low pressure but becomes stiffer when the fibers are straightened to take up the load. The current microstructural models of blood vessels assume affine deformation; i.e., the deformation of each fiber is assumed to be identical to the macroscopic deformation of the tissue. This uniform-field (UF) assumption leads to the macroscopic (or effective) strain energy of the tissue that is the volumetric sum of the contributions of the tissue components. Here, a micromechanics-based constitutive model of fibrous tissue is developed to remove the affine assumption and to tak... Journal of the Mechanics and Physics of Solids journals http://www.medworm.com/rss/comments.php?id=5243391 Thu, 01 Sep 2011 04:00:00 +0100 5243391 http://www.medworm.com/index.php?rid=5243390&cid=s_37330_75_f&fid=37330&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21927507%26dopt%3DAbstract Authors: Thouless MD, Li Z, Douville NJ, Takayama S Abstract When a tensile strain is applied to a film supported on a compliant substrate, a pattern of parallel cracks can channel through both the film and substrate. A linear-elastic fracture-mechanics model for the phenomenon is presented to extend earlier analyses in which cracking was limited to the film. It is shown how failure of the substrate reduces the critical strain required to initiate fracture of the film. This effect is more pronounced for relatively tough films. However, there is a critical ratio of the film to substrate toughness above which stable cracks do not form in response to an applied load. Instead, catastrophic failure of the substrate occurs simultaneously with the propagation of a single channel crack. Th... Journal of the Mechanics and Physics of Solids journals http://www.medworm.com/rss/comments.php?id=5243390 Thu, 01 Sep 2011 04:00:00 +0100 5243390 http://www.medworm.com/index.php?rid=4798771&cid=s_37330_75_f&fid=37330&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D21532929%26dopt%3DAbstract Authors: Ambrosi D, Ateshian GA, Arruda EM, Cowin SC, Dumais J, Goriely A, Holzapfel GA, Humphrey JD, Kemkemer R, Kuhl E, Olberding JE, Taber LA, Garikipati K The continuum mechanical treatment of biological growth and remodeling has attracted considerable attention over the past fifteen years. Many aspects of these problems are now well-understood, yet there remain areas in need of significant development from the standpoint of experiments, theory, and computation. In this perspective paper we review the state of the field and highlight open questions, challenges, and avenues for further development. PMID: 21532929 [PubMed - as supplied by publisher] (Source: Journal of the Mechanics and Physics of Solids) Journal of the Mechanics and Physics of Solids journals http://www.medworm.com/rss/comments.php?id=4798771 Thu, 31 Mar 2011 23:00:00 +0100 4798771 http://www.medworm.com/index.php?rid=1570879&cid=s_37330_75_f&fid=37330&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fentrez%2Fquery.fcgi%3Ftmpl%3DNoSidebarfile%26db%3DPubMed%26cmd%3DRetrieve%26list_uids%3D18568090%26dopt%3DAbstract Authors: Bayly PV, Massouros PG, Christoforou E, Sabet A, Genin GM A magnetic resonance measurement technique was developed to characterize the transient mechanical response of a gel cylinder subjected to angular acceleration. The technique employs tagged magnetic resonance imaging (MRI) synchronized to periodic impact excitation of a bulk specimen. The tagged MRI sequence provides, non-invasively, an array of distributed displacement and strain measurements with high spatial (here, 5 mm) and temporal (6 ms) resolution. The technique was validated on a cylindrical gelatin sample. Measured dynamic strain fields were compared to strain fields predicted using (1) a closed-form solution and (2) finite element simulation of shear waves in a three-parameter "standard" linear viscoelastic cyl... Journal of the Mechanics and Physics of Solids journals http://www.medworm.com/rss/comments.php?id=1570879 Thu, 01 May 2008 04:00:00 +0100 1570879