Results 81 to 90 of about 3,298,007 (203)
Весці Нацыянальнай акадэміі навук Беларусі: Серыя фізіка-тэхнічных навук, 2019 The problems of measurement the physical and mechanical properties of carbon materials by the dynamic microindentation method are considered. The description of the gage design for measurements is given. This gage allows creating different initial energy
A. P. Kren +3 more
doaj +1 more source
Hard-on-Hard Lubrication in the Artificial Hip under Dynamic Loading Conditions
PLoS ONE, 2013 The tribological performance of an artificial hip joint has a particularly strong influence on its success. The principle causes for failure are adverse short- and long-term reactions to wear debris and high frictional torque in the case of poor lubrication that may cause loosening of the implant.
Robert Sonntag +4 more
openaire +4 more sources
, 2013 During introduction this work describes dynamic method of hardness measurement particularly with focus on DHT-100 hardness tester. In the next part, history and development of hardness testing is being mentioned.
KOCH, Karel
core
, 2016 Several works in the past have attempted to correlate uniaxial strength and indentation hardness for a range of materials. The proportionality constant,of an indenter provides the basis to the hardness strength relation of a material. Sharp indenter tips
Aydin, Huseyin +5 more
core +1 more source
Measuring the strength of brittle materials by depth-of-penetration testing [PDF]
, 2010 Based on an energy conservation model, the strength offered by a number of brittle materials has been calculated from depth-of-penetration (DOP) test results. Each material was completely penetrated by a tungsten carbide cored projectile of known kinetic
Hazell, Paul J., P J Hazell
core +1 more source
Effect of Pre-Deformation on ε-Cu Precipitation Behavior in Ultra-Low-Carbon-Bainitic Steel
Teshugang, 2006 The effect of 10% pre-deformation on aging dynamic behavior of an ultra-low-carbon-bainitic steel 0.042~ 0.045C- 1.43～1.48Mn-0.30～0.33Si-0.70～0.73Ni-0.29～0.30Mo-0.025～0.029Nb-0.011～0.019Ti,0.0013~0.0023B containing 0.98~2.90Cu at temperature 450 ℃ and ...
张胤彦 +3 more
doaj
Hard spheres dynamics: weak vs hard collisions
, 2020 We consider the motion of a finite though large number $N$ of hard spheres in the whole space $\mathbb{R}^n$. Particles move freely until they experience elastic collisions. We use our recent theory of Compensated Integrability in order to estimate how much the particles are deviated by collisions. Our result, which is expressed in terms of hodographs,
openaire +3 more sources
On the evolution of the empirical measure for hard-sphere dynamics
, 2015 We prove that the evolution of marginals associated to the empirical measure of a finite system of hard spheres is driven by the BBGKY hierarchical expansion. The usual hierarchy of equations for L^1 measures is obtained as a corollary. We discuss the ambiguities arising in the corresponding notion of microscopic series solution to the Boltzmann-Enskog
PULVIRENTI, Mario, SIMONELLA, SERGIO
openaire +4 more sources
Hardness dynamics in a chemical reaction
, 1994 Temporal evolution of local and global hardness during a chemical reaction modelled as a collision process between a nitrogen atom and a proton has been studied within a quantum fluid density functional framework.
S. Nath +3 more
core +1 more source
DETERMINATION OF ACCURACY AND RELIABILITY OF PORTABLE HARDNESS TESTERS [PDF]
, 2019 The paper is focused on determination of the accuracy and reliability of static and dynamic (portable) hardness testers. The paper deals with the measurement of hardness of calibration hardness plates by 4 different methods (Brinell, Vickers, Rockwell ...
Ján Sovík +5 more
core +1 more source