1 13 - constitutive equations 13 - constitutive equations - volume growth.

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Presentation transcript:

constitutive equations 13 - constitutive equations - volume growth

2 constitutive equations volume growth mass source mass flux growth tensor multiplicative decomposition Lee [1969], Simo [1992], Rodriguez, Hoger & Mc Culloch [1994], Epstein & Maugin [2000], Humphrey [2002], Ambrosi & Mollica [2002], Himpel, Kuhl, Menzel & Steinmann [2005]

3 constitutive equations volume growth at constant density kinematic coupling of growth and deformation free energy mass source stress Rodriguez, Hoger & McCulloch [1994], Epstein & Maugin [2000], Humphrey [2002] growth tensor

4 example - breast cancer volume growth - cylindrical tumor ductal carcinoma is a very common type of breast cancer in women. infiltrating ductal carcinoma refers to the development of invasive cancer cells within the milk ducts of the breast. it accounts for 80% of all types of breast cancer. on a mammography, it is usually visualized as a mass with fine spikes radiating from the edges, and small microcalcification may be seen as well. on physical examination, the lump usually feels hard or firm. on microscopic examination, the cancerous cells invade and replace the surrounding normal tissue inside the breast. the subtypes with histology of mucinous, papillary, cribriform, and tubular carcinomas have a better prognosis, longer survival, and lower recurrence rates Than those with histology like signet-ring cell or inflammatory carcinoma or carcinoma with sarcomatoid metaplasia.

5 example - breast cancer volume growth - cylindrical tumor normal cells grow and multiply at a specific rate. cells that grow and multiply without stopping are called cancerous or malignant. however, they are not detectable when they first start growing. ductal carcinoma In situ is a non- invasive change in the cells that line the milk tubes that bring milk from the milk lobules to the nipple invasive or infiltrating ductal carcinoma is the most common type of breast cancer.it occurs when the cells that line the milk duct become abnormal and spread into the surrounding breast tissue.

6 example - breast cancer volume growth - cylindrical tumor kinematic coupling of growth and deformation free energy deformation stress normal ductal epithelial cells (negative) growth tensor tumor cells of ductal carcinoma (positive) invasive ductal carcinoma cells (strong positive)

7 example - breast cancer volume growth - cylindrical tumor Ambrosi & Mollica [2002]

8 example - breast cancer volume growth - cylindrical tumor axial displacement as a function of growth stress Ambrosi & Mollica [2002] bc‘s growth induced stress on tumor wall

9 example - breast cancer volume growth - cylindrical tumor Ambrosi & Mollica [2002] tumor pressure on duct walls increases with growth

10 example - tumor growth volume growth - spherical tumor kinematic coupling of growth and deformation free energy deformation stress Ambrosi & Mollica [2002] growth tensor

11 example - tumor growth volume growth - spherical tumor Ambrosi & Mollica [2002]

12 example - tumor growth volume growth - spherical tumor balance of momentum stress Ambrosi & Mollica [2002] bc‘s

13 example - tumor growth volume growth - spherical tumor kinematic coupling of growth and deformation ordinary differential eqn of 2nd order in 2B solved numerically Ambrosi & Mollica [2002]

14 example - tumor growth volume growth - spherical tumor Ambrosi & Mollica [2002] hoop stress tensile inside / compressive outside increased growth in outer layers inhomogeneous deformation hoop stress radial stress