Patent RU-2559043-C1 (RU)
Inventor: KHRUSTALEV EVGENIJ NIKOLAEVICH
IPC: G01N3/08
Filed: 2014-04-29
Granted: 2015-08-10
Abstract: FIELD: measurement equipment. 
     SUBSTANCE: invention relates to Contact Interaction Physics of material medium in a limit state. Essence of the invention consists in the fact that limit state of the test medium is determined as per the following relation:          τ     m   e   d     c     =     p     m   e   d     c     t   g   φ   °   +   с   ,              
 where          τ     m   e   d     c           
 and          p     m   e   d     c           
 - values of tangential primary stress        (     τ     m   e   d     c     =     σ   I     =     σ     I   I       )         
 and pressure corresponding to primary tensile-compressive stress        (     σ     I   I   I       =     p     m   e   d     c     )         
 of the medium under conditions of compression of the medium specimen, and values of normal pressure and normal tangential shear stresses of the medium are defined as: 1) under conditions of uniaxial deformation          σ   Z     =     p     m   e   d       a   x   i   s       =       (     p     m   e   d     c     t   g     φ   n   o     +     c   n     +     p     a   t   m       )   sin     φ     "   с   т   р   "     o     cos     φ   n   o     −     с   n         t   g     φ   n   o         −     p     a   t   m           (   k   g   /   c     m   2     )   ,                   τ     m   e   d       a   x   i   s       =     τ     m   e   d     c     sin     φ     "   с   т   р   "     o     cos     φ   n   o      (   k   g   /   c     m   2     )         
 - when shear lines come out onto side surface of the specimen and          τ     m   e   d       a   x   i   s       =     p     m   e   d       a   x   i   s       t   g     φ   n   o     +     с   n         (   k   g   /   c     m   2     )         
 - under die bottom; 2) at deformation of surface of half-space  
               σ   Z     =     p     m   e   d       h   s       =       (     p     m   e   d     c     t   g     φ   n   o     +     с   n     +     p     a   t   m       )   cos     φ     "   с   т   р   "     o     cos     φ   n   o     −     с   n         t   g     φ   n   o         −     p     a   t   m           (   k   g   /   c     m   2     )   ,                   τ     m   e   d       h   s       =     τ     m   e   d     c     cos     φ     "   с   т   р   "     o     cos     φ   n   o         (   k   g   /   c     m   2     )         
 - when shear lines come out onto surface of half-space and          τ     m   e   d       h   s       =     p     m   e   d       h   s       t   g     φ   n   o     +     с   n         (   k   g   /   c     m   2     )         
 - under die bottom; 3) at deformation by the die of the vertical opening bottom          σ   Z     =     p     m   e   d       "   с   к   в   "       =       (     p     m   e   d     c     t   g     φ   n   o     +     с   n     +     p     a   t   m       +     p   d     )   /   (   cos     φ     "   с   т   р   "     o     cos     φ   n   o     )   −     с   n         t   g     φ   n   o         −     p     a   t   m           (   k   g   /   c     m   2     )   ,                   τ     m   e   d       "   с   к   в   "       =     τ     m   e   d     c     /   (   cos     φ     "   с   т   р   "     o     cos     φ   n   o     )       (   k   g   /   c     m   2     )         
 - when shear lines come out of the opening walls and          τ     m   e   d       "   с   к   в   "       =     p     m   e   d       "   с   к   в   "       t   g     φ   n   o     +     с   n         (   k   g   /   c     m   2     )         
 - under the die bottom, where p d =(γ ”стр” h-c ”стр” )ctgφ ”стр”  (kg/cm 2 ) - domestic gravitational pressure; 4) at deformation of the medium in closed massive          σ   Z     =     p     m   e   d     m     =         [     (     p     m   e   d     c     t   g     φ   n   o     +     с   n     +     p   d     )   /   (   cos     φ     "   с   т   р   "     o     sin     φ   n   o     )     ]     −     с   n         t   g     φ   n   o             (   k   g   /   c     m   2     )   ,                   τ     m   e   d     m     =     τ     m   e   d     c     /   (   cos     φ     "   с   т   р   "     o     sin     φ   n   o     )       (   k   g   /   c     m   2     )         
 - when shear lines come out into the cavity above the die and          τ     m   e   d     m     =     p     m   e   d     m     t   g     φ   n   o     +     с   n         (   k   g   /   c     m   2     )         
 - under the die bottom. 
     EFFECT: providing possible determination of normal pressure and normal tangential shear stresses of the medium under conditions of uniaxial deformation, at deformation of half-space surface, and at deformation by the die of the vertical opening bottom. 
     5 cl, 4 dwg