MBS-Modeling for Estimation of Stress and Strain in Human Body

Porosity Structure Offering Improved Biomechanical Stress Distribution and Enhanced Pain-Relieving Potential

Applied Sciences ◽

10.3390/app10093026 ◽

2020 ◽

Vol 10 (9) ◽

pp. 3026

Author(s):

Chia-Cheng Lin ◽

Chia-Yu Wu ◽

Mao-Suan Huang ◽

Bai-Hung Huang ◽

Hsin-Hua Chou ◽

...

Keyword(s):

Human Body ◽

Three Dimensional ◽

Von Mises Stress ◽

Stress And Strain ◽

The Finite Element Method ◽

Human Body Model ◽

Biomechanical Stress ◽

Porosity Structure ◽

Von Mises ◽

Stress Variations

In this study, we developed a three-dimensional (3D) human body model and a body sculpting clothing (BSC) which was fitted onto that body to simulate the biomechanical stress variations of the BSC with different porosity structures using the finite element method. The mechanical properties of the BSC with different porosity structures were also examined through the tensile testing. Analytical results indicated that the Von Mises stress of the BSC with a porosity structure of 10.28% varied from 0.076 MPa to 337.79 MPa. As compared with a porosity structure of 35.18%, the von Mises stress varied from 0.067 MPa to 207.30 MPa. The von Mises stress decreased as the porosity increasing. Based on the statistical analysis findings, we obtained a formula to predict the biomechanical relationships (von Mises stress and strain) between the human body and porosity of the BSC. Therefore, these findings could offer potential information in the modification of BSC for pain-relieving applications.

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DEVELOPMENT OF A BELTED OCCUPANT FE MODEL FOR PREDICTION OF CHEST INJURY RISK BASED ON STRESS AND STRAIN ANALYSIS

Journal of Mechanics in Medicine and Biology ◽

10.1142/s0219519417500609 ◽

2017 ◽

Vol 17 (03) ◽

pp. 1750060

Author(s):

SEN XIAO ◽

JIKUANG YANG ◽

JING HUANG ◽

JEFF R. CRANDALL

Keyword(s):

Human Body ◽

Injury Risk ◽

Human Subjects ◽

Strain Analysis ◽

Element Model ◽

Chest Injury ◽

Stress And Strain ◽

Fe Model ◽

Human Body Model ◽

Virtual Design

This study aims to investigate the chest injury in terms of chest deflections and rib fracture risks based on the stress/strain analysis via a belted occupant finite element model (BOM). The BOM was established using a human body model from the Global Human Body Models Consortium (GHBMC) and the model was validated against a frontal sled test with a Post-Mortem Human Subjects (PMHS). The bio-fidelity of the belted occupant model was then evaluated according to measured data from experimental test regarding detailed torso kinematics and seatbelt forces. The BOM was then used for prediction of the chest injury via calculated injury related parameters from simulations, including stress and strain distributions on the whole ribcage, which could not be fully measured in PMHS test. A study of chest injury risk was conducted with the validated model. Special concern is given to the injuries on rib fractures and chest deflections which have been correlated to the calculated stresses and strains. The results demonstrate that the validation can sufficiently meet the reconstruction of the test and the chest injury outcomes obtained from the simulation can fit the experiment, particularly the fracture risk of the rib 6 to the rib 11 on the chest along the seatbelt path. The current study provides a reference for virtual design and improvement of the chest injury investigation to better prevent chest injuries.

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Microstructural comparison of synthetic bioceramics with natural bioceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100084491 ◽

1991 ◽

Vol 49 ◽

pp. 38-39

Author(s):

Shulin Wen ◽

Jingwei Feng ◽

A. Krajewski ◽

A. Ravaglioli

Keyword(s):

Recent Work ◽

Human Body ◽

Human Tissues ◽

Main Constituent ◽

Laboratory Furnace ◽

Chinese Adult ◽

Human Enamel ◽

Biological Compatibility ◽

Synthetic Hydroxyapatite ◽

Synthetic Work

Hydroxyapatite bioceramics has attracted many material scientists as it is the main constituent of the bone and the teeth in human body. The synthesis of the bioceramics has been performed for years. Nowadays, the synthetic work is not only focused on the hydroapatite but also on the fluorapatite and chlorapatite bioceramics since later materials have also biological compatibility with human tissues; and they may also be very promising for clinic purpose. However, in comparison of the synthetic bioceramics with natural one on microstructure, a great differences were observed according to our previous results. We have investigated these differences further in this work since they are very important to appraise the synthetic bioceramics for their clinic application.The synthetic hydroxyapatite and chlorapatite were prepared according to A. Krajewski and A. Ravaglioli and their recent work. The briquettes from different hydroxyapatite or chlorapatite powders were fired in a laboratory furnace at the temperature of 900-1300°C. The samples of human enamel selected for the comparison with synthetic bioceramics were from Chinese adult teeth.

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Study on erythrocytes by SEM photogrammetry (SEMP) technique

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100161187 ◽

1990 ◽

Vol 48 (3) ◽

pp. 724-725

Author(s):

Tong Wensheng ◽

Lu Lianhuang ◽

Zhang Zhijun

Keyword(s):

Quantitative Analysis ◽

Cell Membrane ◽

Clinical Diagnosis ◽

Human Body ◽

Blood Cells ◽

Three Dimensional ◽

Normal Person ◽

Blood Disease ◽

Computation Technique ◽

Important Basis

This is a combined study of two diffirent branches, photogrammetry and morphology of blood cells. The three dimensional quantitative analysis of erythrocytes using SEMP technique, electron computation technique and photogrammetry theory has made it possible to push the study of mophology of blood cells from LM, TEM, SEM to a higher stage, that of SEM P. A new path has been broken for deeply study of morphology of blood cells.In medical view, the abnormality of the quality and quantity of erythrocytes is one of the important changes of blood disease. It shows the abnormal blood—making function of the human body. Therefore, the study of the change of shape on erythrocytes is the indispensable and important basis of reference in the clinical diagnosis and research of blood disease.The erythrocytes of one normal person, three PNH Patients and one AA patient were used in this experiment. This research determines the following items: Height;Length of two axes (long and short), ratio; Crevice in depth and width of cell membrane; Circumference of erythrocytes; Isoline map of erythrocytes; Section map of erythrocytes.

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