Detection apparatus and detection method of displacement of force application point used for testing rock fracture toughness
A technology for force application point displacement and detection devices, which is applied in the direction of applying repeated force/pulsation force to test the strength of materials, etc., can solve the problems of reducing the detection accuracy of force application point displacement and unstable position, and achieve the effect of eliminating influence and improving detection accuracy
Active Publication Date: 2015-02-25
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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[0004] However, the end plate is positioned with the rock sample by the screw, and when the load is applied to the rock sample for many times, the rock sample will be deformed. Therefore, the relative position between the end plate and the rock sample will move when the rock sample is deformed multiple times, resulting in the unstable position of the pen-type extensometer set on the end plate, thus reducing the displacement of the force application point. Detection accuracy
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[0013] The present invention will be described in further detail below through specific implementation examples and in conjunction with the accompanying drawings.
[0014] Such as figure 1 As shown, the present embodiment provides a force point displacement detection device for rock fracture toughness testing, including a yoke 106, two displacement sensors 110 and a clamp 109; figure 2 and image 3 As shown, the clamp 109 includes a base 601, a first metal block 108 and a second metal block 605 arranged on the base 601; a third metal block 107 and a fourth metal block 701 are arranged on the yoke 106 One displacement sensor 110 is located between the first metal block 108 and the third metal block 107 provided on the yoke 106, and the other displacement sensor is located between the second metal block 605 and the yoke between the fourth metal blocks 701 set on the frame 106 .
[0015] Specifically, when using the detection device, the yoke 106 is embedded in the V-shaped g...
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The invention relates to a field of testing of rock fracture toughness, especially to a detection apparatus and a detection method of displacement of a force application point used for testing rock fracture toughness. The detection apparatus comprises a yoke, two displacement sensors and a clamp, wherein the clamp comprises a pedestal, a first metal block and a second metal block arranged on the pedestal; one displacement sensor is located between the first metal block and a third metal block arranged on the yoke; and the other displacement sensor is located between the second metal block and a fourth metal block arranged on the yoke. The detection apparatus is simple and suitable in structure, convenient to process, level and mount, and good in stability during a testing process, is beneficial for eliminating effects of structural deformation of a three-point bending test fixture on test results of the displacement of the force application point, and improves detection precision of the displacement of the force application point.
Description
technical field [0001] The invention relates to the field of rock fracture toughness testing, in particular to a force application point displacement detection device and detection method for rock fracture toughness testing. Background technique [0002] Rock fracture toughness is the most important parameter and indicator of rock, which characterizes the ability of rock materials to resist crack propagation or the resistance to overcome to generate new crack surfaces. Currently, the V-notch three-point bending beam specimen (CB) is one of the rock fracture toughness test methods recommended by the International Society of Rock Mechanics (ISRM). [0003] When the proposed method is used to test the rock fracture toughness of V-shaped notch rock samples, the rock samples should be subjected to at least 4 loading-unloading cycles. The force point displacement curve provides a basis for nonlinear correction of the tested fracture toughness value. During the displacement detec...
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IPC IPC(8): G01N3/32
Inventor 崔振东刘大安唐铁吾
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI