Results 21 to 30 of about 8,150 (236)

Viscoelastic Properties of Filled Polyurethane Auxetics

open access: yesФізика і хімія твердого тіла, 2021
The paper presents experimental values of lateral and extension transmission ultrasonic waves speed and their absorbance coefficient obtained with the help of discrete immersed method in metal filled polymer auxetic samples with polyurethane matrix ...
T.M. Shevchuk   +4 more
doaj   +1 more source

A New Elementary Method for Determining the Tip Radius and Young’s Modulus in AFM Spherical Indentations

open access: yesMicromachines, 2023
Atomic force microscopy (AFM) is a powerful tool for characterizing biological materials at the nanoscale utilizing the AFM nanoindentation method. When testing biological materials, spherical indenters are typically employed to reduce the possibility of
Stylianos Vasileios Kontomaris   +3 more
doaj   +1 more source

Experimental evaluation of stiffening effect induced by UVA/Riboflavin corneal cross-linking using intact porcine eye globes.

open access: yesPLoS ONE, 2020
UVA/riboflavin corneal cross-linking (CXL) is a common used approach to treat progressive keratoconus. This study aims to investigate the alteration of corneal stiffness following CXL by mimicking the inflation of the eye under the in vivo loading ...
Shao-Hsuan Chang   +4 more
doaj   +1 more source

Evolution Behavior Analysis of Normal Contact Stiffness of Fractal Surface under Loading and Unloading

open access: yesXibei Gongye Daxue Xuebao, 2020
In order to analyze the evolution of normal contact stiffness under loading and unloading, an accurate elastic-plastic contact finite element model between rigid plane and fractal surface is established by introducing the equivalent metal matrix ...

doaj   +1 more source

Duncan-Chang nonlinear constitutive model based on joint strength theory of structural loess

open access: yesYantu gongcheng xuebao, 2018
The Duncan-Chang nonlinear model based on the Mohr-Coulomb strength criterion can better reflect the shear strength characteristics of the soil, but it is not suitable to reflect the tensile strength characteristics of the soil.
LIU Jun-ding 1, LI Rong-jian 1, SUN Ping 2, WANG Zhi-jun 3, LUO Jian-wen 3, LI Zhen-fei 1
doaj   +1 more source

Nonlinear stability analysis of the frame structures [PDF]

open access: yesGrađevinski Materijali i Konstrukcije, 2016
In this paper the phenomenon of instability of frames in elasto-plastic domain was investigated. Numerical analysis was performed by the finite element method.
Ćorić Stanko, Brčić Stanko
doaj   +1 more source

Difficulties and breakthroughs in calculation of foundation settlement

open access: yesYantu gongcheng xuebao, 2019
Terzaghi has founded the theory of soil mechanics for nearly a hundred years, but the two most basic problems of soil mechanics are also the most widely used contents of engineering design, calculation of foundation settlement and reasonable ...
YANG Guang-hua 1, 2
doaj   +1 more source

The small-scale limits of electron beam melt additive manufactured Ti–6Al–4V octet-truss lattices

open access: yesAIP Advances, 2022
The emergence of powder-based additive manufacturing (AM) processes, such as electron beam melting (EBM), enables the one step manufacture of microarchitected metamaterials from topology optimized models.
Andrew Neils, Liang Dong, Haydn Wadley
doaj   +1 more source

Relationships between the tensile strength and diameter of collagen fibrils isolated from mouse tail tendons

open access: yesJournal of Biomechanical Science and Engineering, 2017
The purpose of the present study is to determine the tensile properties of the single collagen fibrils with various diameters using our original tensile test method. The fibrils were directly isolated from mouse tail tendons.
Noritaka YAMAMOTO, Shun NAKAMURA
doaj   +1 more source

A characterization method for equivalent elastic modulus of rock based on elastic strain energy

open access: yesFrontiers in Earth Science, 2023
Energy is an internal variable during rock deformation and failure, and its dissipation and conversion law can reflect the rock’s internal damage and deterioration state.
Tao Qin   +3 more
doaj   +1 more source

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