SOFT, STIFF AND SERVO-CONTROLLED TESTING MACHINES: A REVIEW WITH REFERENCE TO ROCK FAILURE

THIS REVIEW CONTAINS A BRIEF HISTORY OF ROCK SAMPLE TESTING MACHINES AND A DETAILED DISCUSSION OF THE PRINCIPLES INVOLVED IN CONTROLLING ROCK FAILURE WITH STIFF AND SERVOCONTROLLED TESTING MACHINES. THE DEVELOPMENT OF STIFF TESTING MACHINES IS FOLLOWED FROM 1935 TO THE PRESENT DAY, AND THE ROCK SPECIMEN STIFFNESS AND TESTING MACHINE STIFFNESS (FACTORS THAT ARE NEITHER FIXED NOR INDEPENDENT) ARE DISCUSSED IN DETAIL. IN A CLOSED-LOOP SERVO-CONTROLLED TESTING MACHINE, THE ABILITY TO CONTROL ROCK FAILURE IS GOVERNED BY THE FAST RESPONSE TIME AND CORRECT CHOICE OF FEEDBACK SIGNAL. THESE FACTORS ARE EXPLAINED AND EXAMPLES ARE GIVEN OF THE PRECISE CONTROL THAT CAN NOW BE ACHIEVED IN EXPERIMENTAL STUDIES OF ROCK FAILURE THAT WERE IMPRACTICAL OR IMPOSSIBLE SEVERAL YEARS AGO.

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 155-89
  • Serial:

Filing Info

  • Accession Number: 00237159
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Apr 11 1974 12:00AM