THESIS FOR THE DEGREE OF LICENTIATE OF ENGINEERING IN SOLID AND STRUCTURAL MECHANICS Calibration and Modelling of Adipose Tissue Under Impact Loading

نویسنده

  • HOSEIN NASERI
چکیده

Vehicular injury is one of the main reasons for traumatic injuries. Finite Element Human Body Models (FEHBM) have become very popular to assess car crashes and the subsequent injuries. It provides the possibility to predict stress and strain values in tissue level by representing anatomical structures in details. An essential requirement for the FEHBM is to exhibit human-life response, i.e. being biofidelic. Obese occupants are one of the vulnerable populations at higher risk of death and severe injuries in car crashes. However, the developed FEHBMs do not, neither in body shape nor the material properties, represent obese population. In particular, there is no appropriate constitutive model for adipose tissue (fat tissue) in FEHBMs. In the interaction between obese occupants and restraint systems both the body shape and the material property of adipose tissue plays an important role. Therefore the first goal of this research (and the main goal of this thesis) is finding and calibrating a biofidelic constitutive model for adipose tissue. To this end a nonlinear viscoelastic constitutive model was formulated. To have a reliable model calibration at large deformation and a wide range of strain rates (similar to car crash situations), test data of two experiments were used; the frequency-sweep test and the ramp loadingunloading shear test. Prescribing the power-law relation for shear stiffness, which is suggested in the frequency-sweep test, as a constraint in the ramp loading-unloading shear test considerably improved the model prediction for large deformations and high strain rates. To investigate the effect of uncertainties in model parameters and identify important parameters in different experiments, commonly used mechanical testing setups were analyzed. Global sensitivity analysis was used for this purpose. It was found that the amount of compressibility highly affects the behavior of adipose samples in high rates. It is important specially when studying how adipose tissue behavior affects the dynamics of obese occupant responses during crash situations.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Wave Propagation Analysis of CNT Reinforced Composite Micro-Tube Conveying Viscose Fluid in Visco-Pasternak Foundation Under 2D Multi-Physical Fields

In this research, wave propagation analysis in polymeric smart nanocomposite micro-tubes reinforced by single-walled carbon nanotubes (SWCNT) conveying fluid is studied. The surrounded elastic medium is simulated by visco-Pasternak model while the composite micro-tube undergoes electro-magneto-mechanical fields. By means of micromechanics method, the constitutive structural coefficients of nano...

متن کامل

Non-linear Dynamic Analysis of Steel Hollow I-core Sandwich Panel under Air Blast Loading

In this paper, the non-linear dynamic response of novel steel sandwich panel with hollow I-core subjected to blast loading was studied. Special emphasis is placed on the evaluation of midpoint displacements and energy dissipation of the models. Several parameters such as boundary conditions, strain rate, mesh dependency and asymmetrical loading are considered in this study. The material and geo...

متن کامل

Fatigue Life Prediction of Rivet Joints

Strength reduction in structures like an aircraft could be resulted as cyclic loads over a period of time and is an important factor for structural life prediction. Service loads are emphasized at the regions of stress concentration, mostly at the connection of components. The initial flaw prompting the service life was expected by using the Equivalent Initial Flaw Size (EIFS) which has been re...

متن کامل

Analysis of Viscoelastic Functionally Graded Sandwich Plates with CNT Reinforced Composite Face Sheets on Viscoelastic Foundation

In this article, bending, buckling, and free vibration of viscoelastic sandwich plate with carbon nanotubes reinforced composite facesheets and an isotropic homogeneous core on viscoelastic foundation are presented using a new first order shear deformation theory. According to this theory, the number of unknown’s parameters and governing equations are reduced and also the using of shear correct...

متن کامل

Defects and Structural Analysis of Multi-Wall Carbon Nano Tubes via Ball milling and Cryo-milling

Nano fillers are part of new studies to enhance various properties of fluids and solids. For example, adding nanoparticles as an enforcement in nanocomposites or as an additive to improve thermal or electrical properties in nano-fluids are of extreme importance in science and industry. There are numerous methods to uniformly disperse nanoparticles in fluid and solid phase. One of the well-used ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2017