The present invention provides a supercritical carbon dioxide core fracturing holder under pore pressure saturation, including a holding sleeve; a left end sleeve and a right end sleeve are correspondingly embedded at the two end ports of the holding sleeve, and a fixed plug is docked to the left end sleeve; a moving plug movably passes through the right end sleeve, and a piston ring is formed on the outer side face of the moving plug; a sealing rubber sleeve for holding a test sample is disposed; two axial fluid injection pipelines are correspondingly disposed within the fixed plug and the moving plug; and an axial displacement measuring device is disposed between the outer end of the right end sleeve and the moving plug, and a fluid injection chamber is formed between the inner wall of the holding sleeve and the outer side face of the sealing rubber sleeve.

A wafer measurement apparatus for measuring a bonding strength of a bonded wafer includes a wafer holder to hold a bonded wafer into which a blade is inserted and where a crack occurs, a lighting assembly including a light source, a light source controller to select the light source of the lighting assembly for detection of the crack reflected in the bonded wafer, on photographing conditions, a photographing assembly to photograph the bonded wafer by using the photographing conditions corresponding to a wavelength of the light source, on sensitivity of the wavelength of the light source, and a calculator to select one photographing condition, transmit the selected photographing condition, and calculate bonding strength, on a crack distance from a blade edge, extracted from an image of the bonded wafer, to a crack edge.

A method of offset load testing a tubular composite specimen with two pairs of aligned holes and having at least one defect, the method comprising: providing a testing apparatus having a pair of arms including a fixed arm and a mobile arm; securing the pair of arms using a fastener assembly in each of the two pairs of aligned holes; and moving the mobile arm to impart an offset load force to the tubular specimen. One aspect includes a method of offset load testing comprising: providing a testing apparatus having a pair of arms including a fixed arm and a mobile arm; providing a tubular composite specimen with a top portion and a bottom portion; securing the pair of arms to the top and bottom portions of the tubular composite specimen; and moving the mobile arm to impart an offset load force to the tubular composite specimen.

In an aspect, there is a method of determining allowable defects for a composite component comprising identifying at least one wrinkle characteristic of a composite component wrinkle defect; making a first plurality of specimens each having a predetermined wrinkle defect representative of the composite component wrinkle defect; measuring each of the predetermined wrinkle defects in the first plurality of specimens for at least one performance metric to generate performance data; and generating an allowable wrinkle defect profile based on the performance data from the first plurality of specimens. In other aspects, there are methods of making a specimen with a predetermined wrinkle defect.

A tension testing apparatus and system is disclosed in which the tension testing apparatus includes a first box including a first outer plate and a first inner plate, a second box including a second outer plate and a second inner plate, and a test sample holding system coupled to the first inner plate and the second inner plate. The first outer plate and the first inner plate may be coupled together by at least two rods. The second outer plate and the second inner plate may be coupled together by at least two other rods. The test sample holding system may be configured to hold a test sample. The at least two rods of the first box may be configured to pass through the second inner plate. The at least two rods of the second box may be configured to pass through the first inner plate.

In a first aspect, there is a method of making a specimen with a predetermined wrinkle defect, the steps including orienting a composite material around a layup tool at a wrap angle to form a closed loop; and generating at least one wrinkle with a predetermined characteristic in a portion of the closed loop to form a specimen. The predetermined characteristic is at least one of the following: wrinkle location, an outward wrinkle, an inward wrinkle, a wrinkle width, a wrinkle height, and a wrinkle length. In another aspect, there is a method of determining allowable defects for a composite component.

A closed-loop control method based on a testing machine for accurately controlling the loosening of a bolt transverse load is disclosed. The testing machine for accurately controlling the loosening of the transverse load comprises a load generating motor, a load transfer mechanism, a load control motor and a load control mechanism. The control method of the present invention controls the load generating motor to drive the load transfer mechanism based on control commands, displacement signals collected by the displacement sensor and force signals collected by an S-shaped column type pressure sensor. The testing machine for the looseness of the bolt transverse load is essential in the aspect of exploring a looseness law of a bolt, and can be used to simulate load bearing conditions of the bolt. However, under the condition that some bolts bear constant force load transversely, the testing machine is not used or is inaccurate. The control method of the present invention can accurately control the load transverse load to be stable, especially can ensure constant transverse load and can also simulate the transverse load bearing situation of the bolt more accurately and more comprehensively.

There is a method of making a tubular specimen with a predetermined wrinkle defect including providing a layup tool with a cavity forming member having a cavity which resembles a desired shape of the at least one wrinkle; orienting a composite material around the mandrel at a wrap angle to form a closed loop; positioning a wrinkle tool on the closed loop; and/or generating at least one wrinkle with a predetermined characteristic in a portion of the closed loop to form a tubular specimen. The predetermined characteristic is at least one of the following: wrinkle location, an outward wrinkle, an inward wrinkle, a wrinkle width, a wrinkle height, and a wrinkle length. In another aspect, there is a method of offset load testing a tubular composite specimen. In a third aspect, there is a method of determining allowable defects for a composite component.

A wafer measurement apparatus for measuring a bonding strength of a bonded wafer includes a wafer holder to hold a bonded wafer into which a blade is inserted and where a crack occurs, a lighting assembly including a light source, a light source controller to select the light source of the lighting assembly for detection of the crack reflected in the bonded wafer, on photographing conditions, a photographing assembly to photograph the bonded wafer by using the photographing conditions corresponding to a wavelength of the light source, on sensitivity of the wavelength of the light source, and a calculator to select one photographing condition, transmit the selected photographing condition, and calculate bonding strength, on a crack distance from a blade edge, extracted from an image of the bonded wafer, to a crack edge.

An apparatus and method to strength test porous ceramic honeycomb bodies. The apparatus includes an interlayer between at least one platen and a surface of the high porosity honeycomb body to be tested. The method includes disposing at least one interlayer between at least one platen and an end face of the body, applying a force to the high porosity ceramic honeycomb body and monitoring a result of applying the force. The interlayer comprises a surface weight of about 350 g/m.sup.2 and a thickness in a direction N between facing surfaces load platens of at least about 20 mm. Axial and radial localized stamping tests also strength test porous ceramic honeycomb bodies.