Article
Engineering, Mechanical
A. Yakovenko, I Goryacheva
Summary: This study investigates the interaction between a periodic system of rigid spherical indenters and a viscoelastic half-space using linear viscoelastic models. The case of constant load applied to each indenter is explored. Analytical expressions for contact pressure, radius of contact spot, and additional displacement function are derived using the localization method and the solution of the corresponding elastic problem. The influence of contact density and viscoelastic mechanical properties of the half-space on the variation of contact characteristics in time is analyzed.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Mechanics
Carmine Putignano, Giuseppe Carbone
Summary: A numerical Boundary Element methodology is developed to model the indentation process of thin layers of viscoelastic materials, and numerical analyses show that finite values of the contacting layers thickness produce significant changes in the experimental results.
MECHANICS RESEARCH COMMUNICATIONS
(2022)
Article
Engineering, Multidisciplinary
Simon Roa Diaz
Summary: This paper presents a direct derivation of an analytical expression to estimate the elastic-plastic solids energy dissipation capacity from Depth Sensing Indentation data, and proposes a method for fast calculating the elastic-to-total strain energy ratios. The simplifications and assumptions made in this work ensure accurate results, representing an improvement in the estimation of these ratios in terms of time spending and accuracy.
Article
Materials Science, Multidisciplinary
Sureshkumar Kalyanam, Kathleen S. Toohey, Michael F. Insana
Summary: In this study, the mechanical behavior of gelatin hydrogels was examined through indentation tests using a biphasic poroviscoelastic (BPVE) material model and finite element analysis. The relaxed shear modulus was found to be an intrinsic material property for soft tissues and hydrogels, suitable for comparison with results obtained from other experiments.
MECHANICS OF MATERIALS
(2021)
Article
Construction & Building Technology
Xijun Shi, Aishwarya Baranikumar, Zachary Grasley
Summary: The study developed an integrated modeling approach to accurately predict and determine the evolution of material properties of desiccating cementitious materials, including moisture diffusion coefficient and viscoelastic compliance.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
M. R. Islam, M. L. Oyen
Summary: Load-relaxation behavior of physical and chemical gels shows strong time-dependence, with physical gels exhibiting pronounced relaxation over short time-scales and chemical gels being largely time-independent. The intrinsic permeability of the materials, related to underlying pore structure, is time-independent for both physical and chemical gels, highlighting the importance of understanding these structure-properties relationships. Comparative analysis reveals that different time-dependent properties of biological tissues are captured by physical and chemical hydrogels, with implications for tissue engineering applications.
EXPERIMENTAL MECHANICS
(2021)
Article
Mathematics, Applied
Kotaro Miura, Chihiro Oyama, Makoto Sakamoto, Yuji Tanabe
Summary: This study utilized relaxation indentation tests and analytical solutions to evaluate the viscoelastic parameters of different materials, finding that the five-element model is more suitable for describing the materials' relaxation behavior. Additionally, the viscoelastic parameters of treated articular cartilage significantly decreased, providing a tool for assessing cartilage degeneration.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2021)
Article
Materials Science, Multidisciplinary
Yu Leng, Arezoo M. Ardekani, Hector Gomez
Summary: Researchers have used a complex model including a poro-elastic model and a viscoelastic constitutive law of the solid to study the process of subcutaneous injection. By validating experimental data and comparing different models, they found that the pressure at the injection site will differ significantly when considering the viscosity of the solid.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Geochemistry & Geophysics
Jianfeng Wang, Yuke Liu, Chao Yang, Wenmin Jiang, Yun Li, Yongqiang Xiong
Summary: The viscoelastic behavior of quartz and clay minerals in shale was studied using nanoindentation and optical microscope techniques. The results showed that residual imprints on clay minerals were larger and had higher initial creep rates and depths compared to quartz. However, the creep rates displayed similar trends for both minerals, independent of peak load. Three viscoelastic models were used to fit the experimental data, with Burger's model performing the best in obtaining regression parameters. The regression results indicated that the viscoelastic parameters are associated with peak load, and clay minerals had lower viscoelastic parameters compared to quartz and the bulk shale.
Article
Construction & Building Technology
Xavier Centelles, Fernandez Pelayo, Maria Jesus Lamela-Rey, A. Ines Fernandez, Rebeca Salgado-Pizarro, J. Ramon Castro, Luisa F. Cabeza
Summary: This study evaluated seven different commercial interlayer materials through relaxation tests to determine their viscoelastic behavior, and provided the Prony coefficients and components of the complex modulus needed for creating numerical models.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Jong-hyoung Kim, Oh Min Kwon, Junsang Lee, Hae-Jin Son, Young-Cheon Kim, Seung-Kyun Kang
Summary: In this study, an advanced method based on spherical indentation is proposed to accurately predict the plastic pile-up height in metallic materials and estimate the tensile properties using the obtained contact morphology. Experimental observations confirm the model's accuracy in predicting pile-up height for different metallic materials, and its improvement in agreement with tension tests at small strains.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Engineering, Biomedical
Lei Shi, Kristin Myers
Summary: The cervix is a vital mechanical barrier to protect the growing fetus and its remodeling is necessary for safe parturition. This study investigates the time-dependent behavior of the cervix under compressive states using a porous-viscoelastic material model and inverse finite element analysis. The results show that the porous-viscoelastic model captures the force-relaxation response of the cervix well and has the potential to understand premature cervical remodeling and interpret force readings from in-vivo measurement tools.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Physics, Applied
A. Ganeau, M. Lafond, F. Legrand, G. Laloy-Borgna, O. Ben Moussa, S. Poinard, F. Mascarelli, G. Thuret, P. Gain, C. Lafon, S. Catheline
Summary: This study characterizes the viscoelastic properties of in vitro crystalline lens samples using a curvilinear harmonic method based on noise correlation algorithms. The study observes the dispersion of surface waves at different frequencies and provides accurate measurements of shear elasticity and viscosity. The findings have implications for potential treatments of presbyopia.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Coatings & Films
Jianan Song, Jia Huang, Zhilai Lu, Lu Qiu, Hongyu Qi, Zhibin Yan
Summary: The use of ink-jet printing in the production of film sensors for gas turbines has great potential. This study investigates the mechanical properties of ink-jet printed films with different thicknesses through indentation tests. Additionally, an anisotropic phase field fracture model is employed to simulate the deformation and cracking mechanisms of ink-jet films with different microstructures. The study emphasizes the evaluation of the accuracy of indentation tests for films with intricate structures, taking into account the effects of thickness and micro-void distributions. This research provides innovative insights into the structural-dependent failure mechanism of ink-jet films, offering a new perspective on the design of films with high mechanical strength.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Polymer Science
Alexander Korolev, Maxim Mishnev, Nikolai Ivanovich Vatin, Anastasia Ignatova
Summary: The study on the rigidity and deformation characteristics of polymer materials under elevated temperatures is crucial for engineering and applications. The analysis of thermo-relaxation can provide important insights for the design and performance optimization of polymer materials.
Article
Biophysics
Boran Zhou, Kyle J. Schaefbauer, Ashley M. Egan, Eva M. Carmona Porquera, Andrew H. Limper, Xiaoming Zhang
JOURNAL OF BIOMECHANICS
(2020)
Article
Engineering, Biomedical
Xiaoming Zhang, Boran Zhou, Stephen L. Kopecky, Landon W. Trost
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2020)
Article
Engineering, Biomedical
Boran Zhou, Brian J. Bartholmai, Sanjay Kalra, Xiaoming Zhang
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2020)
Article
Surgery
Samyd S. Bustos, Boran Zhou, Tony C. T. Huang, Juntao Shao, Pedro Ciudad, Antonio J. Forte, Xiaoming Zhang, Oscar J. Manrique
ANNALS OF PLASTIC SURGERY
(2020)
Article
Engineering, Biomedical
Boran Zhou, Juntao Shao, Cassandra K. Kisby, Xiaoming Zhang
CLINICAL BIOMECHANICS
(2020)
Article
Acoustics
Boran Zhou, Juntao Shao, Kyle J. Schaefbauer, Ashley M. Egan, Eva M. Carmona, Andrew H. Limper, Xiaoming Zhang
Summary: Ultrasound image grading and texture analysis are valuable and meaningful methods for assessing pulmonary fibrosis in a bleomycin mouse model. The severe fibrosis group showed statistically higher grades in surface smoothness, echo density, and angle compared to the control and mild fibrosis groups; significant differences were also observed in contrast, correlation, and homogeneity between the mild and severe fibrosis groups.
JOURNAL OF ULTRASOUND IN MEDICINE
(2021)
Article
Acoustics
Xiaoming Zhang, Alex X. Zhang, Boran Zhou, Xiaolei Xu
Article
Engineering, Biomedical
Mackenzie L. Wheeler, Michelle L. Oyen
Summary: Research on the complex functioning of the human placenta faces challenges due to a lack of suitable physiological in vivo models. To address this, two complementary approaches have emerged recently: computational in silico techniques and cellular in vitro methods. These approaches allow for investigations into early and later-term placental functions, highlighting the importance of taking a holistic approach to studying this temporary but critical organ.
ANNALS OF BIOMEDICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
M. R. Islam, M. L. Oyen
Summary: Load-relaxation behavior of physical and chemical gels shows strong time-dependence, with physical gels exhibiting pronounced relaxation over short time-scales and chemical gels being largely time-independent. The intrinsic permeability of the materials, related to underlying pore structure, is time-independent for both physical and chemical gels, highlighting the importance of understanding these structure-properties relationships. Comparative analysis reveals that different time-dependent properties of biological tissues are captured by physical and chemical hydrogels, with implications for tissue engineering applications.
EXPERIMENTAL MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Michelle L. Oyen
Summary: Eggshell is a biogenic material synthesized quickly under near-ambient conditions, with intriguing mechanical properties. Research has shown that the elastic modulus and hardness of eggshell remain constant across different egg-laying species, indicating the importance of eggshell structure. The fibrous eggshell membrane has a significant effect on egg elasticity and fracture work, independent of mineral quality, making it a unique target for improving egg mechanical properties.
Article
Engineering, Biomedical
Alys R. Clark, Kyoko Yoshida, Michelle L. Oyen
Summary: This study discusses the application of computational biomechanical approaches in pregnancy research, focusing on preterm pre-labor rupture of membranes, utero-placental interface, and maternal cardiovascular function during pregnancy. Computational models prove to be attractive in addressing logistical and ethical challenges in pregnancy research.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Michelle L. Oyen
Summary: Historically, medical conditions that predominantly affect women have been under-studied. This article examines the reasons for this discrepancy and discusses the research on women's reproductive tissues, biomaterials, and women's health.
Article
Materials Science, Multidisciplinary
Mackenzie L. Wheeler, Michelle L. Oyen
Summary: Preterm birth affects 10% of pregnancies worldwide, with the majority caused by rupture of the amniotic sac. This study examines gelatin membranes as potential materials for patching fetal membranes in medical interventions. The researchers found that stiffness was not affected by crosslinking, but failure strength varied. Compared to natural amnion, electrospun materials were stiffer and stronger but less fracture resistant. Further research is needed to understand the structure-properties relationships in fibrillar materials.
Article
Materials Science, Multidisciplinary
Robert F. Cook, Michelle L. Oyen
Summary: This article discusses the failure and fracture properties of hydrogels and hydrogel composites in the contexts of applicable fracture mechanics and biomaterials engineering. It distinguishes between material failure properties and fracture properties, with the latter requiring clear identification of crack propagation. While advanced hydrogels can exhibit very large works of failure at large strains, the relevance of large failure strains to certain biomaterial applications, such as cartilage replacement, is not obvious. An example of fiber-reinforced hydrogel composites that demonstrate increased work of failure at small strains is provided.
JOURNAL OF PHYSICS-MATERIALS
(2021)
Article
Acoustics
Boran Zhou, Xiaofeng Yang, Xiaoming Zhang, Walter J. Curran, Tian Liu
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2020)