The invention discloses a method for evaluating the longitudinal deformation of proppant pack, mainly comprising the following steps: displace the proppant evenly on one steel sheet and cover the proppant with another same steel sheet; place pistons on the outer surface of two steel sheets respectively to form a test unit; place the test unit on fracture conductivity tester, compact the proppant pack at a pressure of 0.6 MPa, measure the width between the two steel sheets at the four corners of the steel sheet, and calculate the average results; install the left and right displacement meters, increase the closure pressure from 6.9 MPa to 69 MPa with an increment of 6.9 MPa/time by pressure control system, record the readings of the left and right displacement meters after the pressure is increased each time and the meter reading is stable, and work out the total deformation of the experimental equipment and the proppant; make a curve chart of the relationship between pack thickness and pressure, and characterize the proppant pack deformation with Young's modulus. The evaluation method disclosed in the present invention makes up the technical gap in the study of proppant pack deformation in the prior art.

The invention discloses a method for evaluating the longitudinal deformation of proppant pack, mainly comprising the following steps: displace the proppant evenly on one steel sheet and cover the proppant with another same steel sheet; place pistons on the outer surface of two steel sheets respectively to form a test unit; place the test unit on fracture conductivity tester, compact the proppant pack at a pressure of 0.6 MPa, measure the width between the two steel sheets at the four corners of the steel sheet, and calculate the average results; install the left and right displacement meters, increase the closure pressure from 6.9 MPa to 69 MPa with an increment of 6.9 MPa/time by pressure control system, record the readings of the left and right displacement meters after the pressure is increased each time and the meter reading is stable, and work out the total deformation of the experimental equipment and the proppant; make a curve chart of the relationship between pack thickness and pressure, and characterize the proppant pack deformation with Young's modulus. The evaluation method disclosed in the present invention makes up the technical gap in the study of proppant pack deformation in the prior art.

A calibration determination device includes: a free roll that conveys the bonding member; a load detection device that detects a load applied to a bearing of the free roll; a tension adjustment device that winds the bonding member to increase a tension applied to the bonding member and unwinds the bonding member to reduce the tension applied to the bonding member so as to adjust the tension applied to the bonding member; and a calibration determination unit that determines whether calibration of the load detection device is necessary. The tension adjustment device unwinds the bonding member to cause the bonding member not to be subjected to the tension, and the calibration determination unit determines whether the calibration of the load detection device is necessary based on the load detected by the load detection device with the bonding member not being subjected to the tension.

A notch treatment method for flaw simulation including providing the specimen with the notch, the notch having a re-melt material layer; isolating the notch; and selectively etching the notch to provide an etched surface of the notch; wherein at least a portion of the re-melt material layer has been removed from the notch. In one aspect, there is provided a notch treatment method for flaw simulation including providing the specimen with the notch, the notch having a re-melt material layer, the specimen includes steel or an alloy thereof; isolating the notch; and selectively etching the notch with a first etching solution and a second etching solution to provide an etched surface on the notch; wherein at least a portion of the re-melt material layer has been removed from the notch.

A notch treatment method for flaw simulation including providing the specimen with the notch, the notch having a re-melt material layer; isolating the notch; and selectively etching the notch to provide an etched surface of the notch; wherein at least a portion of the re-melt material layer has been removed from the notch. In one aspect, there is provided a notch treatment method for flaw simulation including providing the specimen with the notch, the notch having a re-melt material layer, the specimen includes steel or an alloy thereof; isolating the notch; and selectively etching the notch with a first etching solution and a second etching solution to provide an etched surface on the notch; wherein at least a portion of the re-melt material layer has been removed from the notch.

A method for calibrating a load testing machine includes a computational unit that is operable to carry out, in a fully automatic manner, an operation of calibration of the load testing machine in order to help reduce the cost of the operation of calibration of the load testing machine and to improve creditability thereof. The load testing machine, as well as a master load cell and a load reader thereof, is set in connection with a computational unit so that the computational unit is operable to directly output an instruction for an operation of the load testing machine and the computational unit is operable to directly record the load obtained with the load testing machine in the calibration and a corresponding calibration values from the force sensor of the testing machine. A set calibration parameters can be calculated and obtained for completing the calibration of the load testing machine.

A method for calibrating a load testing machine includes a computational unit that is operable to carry out, in a fully automatic manner, an operation of calibration of the load testing machine in order to help reduce the cost of the operation of calibration of the load testing machine and to improve creditability thereof. The load testing machine, as well as a master load cell and a load reader thereof, is set in connection with a computational unit so that the computational unit is operable to directly output an instruction for an operation of the load testing machine and the computational unit is operable to directly record the load obtained with the load testing machine in the calibration and a corresponding calibration values from the force sensor of the testing machine. A set calibration parameters can be calculated and obtained for completing the calibration of the load testing machine.

The invention relates to a method for the mechanical testing of a structure (1, 10) formed as one part, comprising the following steps: a) identifying a sub-element (2, 11) in the structure (1, 10) formed as one part for generating a test element (3, 3) that is intended to undergo mechanical testing, wherein the sub-element (2, 11) only represents a portion of the structure (1, 10) formed as one part, b) determining the spatial-geometrical structure of the sub-element (2, 11), c) generating the test element (3, 3) on the basis of the spatial-geometrical structure of the sub-element (2, 11) and at least in part or in full by way of a 3D printing process, d) carrying out at least one mechanical test on the test element (3, 3) generated. A further subject matter of the present invention is a method for modifying the structural design data of the structure (1, 10) formed as one part, in which the data of the mechanical testing that is obtained from the aforementioned method is used for a modification of the structural design data of the structure (1, 10).

The invention relates to a method for the mechanical testing of a structure (1, 10) formed as one part, comprising the following steps: a) identifying a sub-element (2, 11) in the structure (1, 10) formed as one part for generating a test element (3, 3) that is intended to undergo mechanical testing, wherein the sub-element (2, 11) only represents a portion of the structure (1, 10) formed as one part, b) determining the spatial-geometrical structure of the sub-element (2, 11), c) generating the test element (3, 3) on the basis of the spatial-geometrical structure of the sub-element (2, 11) and at least in part or in full by way of a 3D printing process, d) carrying out at least one mechanical test on the test element (3, 3) generated. A further subject matter of the present invention is a method for modifying the structural design data of the structure (1, 10) formed as one part, in which the data of the mechanical testing that is obtained from the aforementioned method is used for a modification of the structural design data of the structure (1, 10).

The invention relates to a device for carrying out bending tests on panel-shaped or beam-shaped samples (1), in which two rotary drives are arranged at a distance from one another and a flange (3) is fastened to each of the drive shafts of the rotary drives, said drive shafts being oriented parallel to one another. At least two bar-shaped bending elements (2) oriented parallel to the axis of rotation of the drive shafts and arranged at a distance from the axis of rotation and at a distance from one another are provided on each of the flanges (3). A panel-shaped or beam-shaped sample (1) can be introduced between the two bar-shaped bending elements (2) on the two flanges (3). In the event of rotation of the rotary drives in opposite directions of rotation, bending forces are exerted on the sample (1) and each of the two rotary drives can be controlled individually and connected to an electronic open-loop or closed-loop control unit.