scholarly journals Empirical determination of the mechanical properties of Vacuum Packed Particles

2019 ◽  
Vol 254 ◽  
pp. 05008 ◽  
Author(s):  
Piotr Bartkowski ◽  
Robert Zalewski
Keyword(s):  
Mechanical Properties ◽  
Numerical Model ◽  
Model Validation ◽  
Experimental Test ◽  
Empirical Determination ◽  
Validation Procedure

In this work the experimental test of Vacuum Packed Particles (VPP) under 3-point bending are presented. VPP it is the structure compose of grains inside the plastomer coating. When the pressure inside is equal or higher than zero structure behave like a liquid, otherwise like a elasto-plastic solid. Three types of grain material and different values of underpressure were tested. Results presented in this paper will be used in the further work for the numerical model validation procedure.

scholarly journals Numerical Model for the Determination of Erythrocyte Mechanical Properties and Wall Shear Stress in vivo From Intravital Microscopy

2020 ◽  
Vol 10 ◽  
Author(s):  
Vivek P. Jani ◽  
Alfredo Lucas ◽  
Vinay P. Jani ◽  
Carlos Munoz ◽  
Alexander T. Williams ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shear Stress ◽  
Numerical Model ◽  
Wall Shear Stress ◽  
Intravital Microscopy ◽  
Wall Shear

Numerical Simulation of Glider Crash Against a Non-Deformable Barrier

2011 ◽  
Vol 58 (2) ◽  
pp. 245-265
Author(s):  
Lukasz Lindstedt
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Experimental Test ◽  
Crash Test ◽  
Computational Results ◽  
Research Projects ◽  
Time Intervals ◽  
Rigid Barrier ◽  
Safety Belts

Numerical Simulation of Glider Crash Against a Non-Deformable Barrier This study, describing computer simulation of a glider crash against a non-deformable ground barrier, is a part of a larger glider crash modeling project. The studies were intended to develop a numerical model of the pilot - glider - environment system, whereby the dynamics of the human body and the composite cockpit structure during a crash would make it possible to analyze flight accidents with focus on the pilot's safety. Notwithstanding that accidents involving glider crash against a rigid barrier (a wall, for example) are not common, establishing a simulation model for such event may prove quite useful considering subsequent research projects. First, it is much easier to observe the process of composite cockpit structure destruction if the crash is against a rigid barrier. Furthermore, the use of a non-deformable barrier allows one to avoid the errors that are associated with the modeling of a deformable substrate, which in most cases in quite problematic. Crash test simulation, carried out using a MAYMO package, involved a glider crash against a wall positioned perpendicularly to the object moving at a speed of 77 km/h. Computations allowed for determination of time intervals of the signals that are required to assess the behavior of the cockpit and pilot's body - accelerations and displacements in selected points of the glider's structure and loads applied to the pilot's body: head and chest accelerations, forces at femur, lumbar spine and safety belts. Computational results were compared with the results of a previous experimental test that had been designed to verify the numerical model. The glider's cockpit was completely destroyed in the crash and the loads transferred to the pilot's body were very substantial - way over the permitted levels. Since modeling results are fairly consistent with the experimental test, the numerical model can be used for simulation of plane crashes in the future.

Description of Cyclic Properties of Steel in Variability Conditions of Mean Values and Amplitudes of Loading Cycles

2012 ◽  
Vol 726 ◽  
pp. 69-76 ◽  
Author(s):  
Grzegorz Szala ◽  
Bogdan Ligaj
Keyword(s):  
Mechanical Properties ◽  
Mathematical Models ◽  
Experimental Test ◽  
Point Of View ◽  
Test Results ◽  
Mean Values ◽  
Fatigue Characteristics ◽  
Verification Test

The work includes description of determination of two-parametric fatigue characteristics (TFC) on the base of experimental test results and description of mathematical models of these characteristics. Mathematical models were verified in C45 and 41Cr4 tests that are essentially different from the point of view of mechanical properties. On the base of analysis of verification test results there were determined ranges of applications of TFC models described in the work.

Basic set of experiments for determination of mechanical properties of sand

2014 ◽  
Vol 62 (1) ◽  
pp. 129-137
Author(s):  
A. Sawicki ◽  
J. Mierczyński
Keyword(s):  
Mechanical Properties ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Local Strain ◽  
Initial State ◽  
Laboratory Equipment ◽  
Additional Information ◽  
Basic Set ◽  
Initial Anisotropy

Abstract A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.

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