کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
445258 693164 2010 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Estimating zero-strain states of very soft tissue under gravity loading using digital image correlation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر گرافیک کامپیوتری و طراحی به کمک کامپیوتر
پیش نمایش صفحه اول مقاله
Estimating zero-strain states of very soft tissue under gravity loading using digital image correlation
چکیده انگلیسی

This paper presents several experimental techniques and concepts in the process of measuring mechanical properties of very soft tissue in an ex vivo   tensile test. Gravitational body force on very soft tissue causes pre-compression and results in a non-uniform initial deformation. The global digital image correlation technique is used to measure the full-field deformation behavior of liver tissue in uniaxial tension testing. A maximum stretching band is observed in the incremental strain field when a region of tissue passes from compression and enters a state of tension. A new method for estimating the zero-strain state is proposed: the zero strain position is close to, but ahead of the position of the maximum stretching band, or in other words, the tangent of a nominal stress–stretch curve reaches minimum at λ≳1λ≳1. The approach, to identify zero strain by using maximum incremental strain, can be implemented in other types of image-based soft tissue analysis. The experimental results of 10 samples from seven porcine livers are presented and material parameters for the Ogden model fit are obtained. The finite element simulation based on the fitted model confirms the effect of gravity on the deformation of very soft tissue and validates our approach.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Medical Image Analysis - Volume 14, Issue 2, April 2010, Pages 126–137
نویسندگان
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