A compressive load is exerted with a test apparatus across a rock sample that has a specified length-to-diameter ratio. A strain on the rock sample is measured during the compressive loading with a strain gauge. A mechanical property of the rock sample is determined based at least in part on the compressive load. An elastic property of the rock sample is determined based at least in part on the measured strain and the compressive load.

A system and method is provided for measuring a mechanical property of a biological tube. The system and method operate to arrange a plurality of piezoelectric elements about the biological tube and apply a predetermined force or transduce an endogeneous or exogeneous force to the biological tube. The system and method also operate to receive a respective signal from each piezoelectric element in the plurality of piezoelectric elements responsive to the application of the predetermined force or a transduced endogenous or exogeneous force and calculate the mechanical property of the biological tube based on the signals received from the plurality of piezoelectric elements.

A method and apparatus for testing rings cut from pipes for use in making subsea pipelines are described. The method for determining the whether a test ring is correctly assembled in a test chamber for testing pipes for use in making subsea pipelines comprises: mounting a test ring in a pressure chamber such that the ends of the test ring forms seals with opposing surfaces of the chamber to isolate the inside of the test ring from the outside; providing means for measuring the displacement of the test ring; providing means for measuring a force applied to the inner surface of the test ring; applying a force to the inner surface of the test ring; and using the displacement measurement and force measurements to determine whether the test ring is correctly mounted in the pressure chamber.

A hose to be evaluated is installed on a fixing frame in a preset shape, and a strain gauge and markers are attached to a surface of the hose. During a course of application of predetermined internal pressure to the hose, strain data is acquired using the strain gauge and an image of an external shape of the hose is captured using a camera device to acquire image data. Based on the strain data and the image data acquired, a change in the shape of the hose between a plurality of time points at identical internal pressure is determined. Such hose fatigue resistance evaluation system can determine changes in the degree of deformation of a hose over time due to repeated application of internal pressure.

A testing device for testing the mechanical integrity of a hollow breakable item includes a squeezable element to radially abut with a sidewall portion of the breakable item. The testing device further includes a sleeve extending in an axial direction to receive the sidewall portion of the breakable item and having a first contact surface to axially engage with the squeezable element. The testing device also includes a plunger displaceable in axial direction relative to the sleeve and having a second contact surface to axially engage with the squeezable element. The squeezable element is axially squeezable by a relative displacement of plunger and sleeve to increase the squeezable element's radial expansion and to apply radially directed pressure to the breakable item's sidewall portion.

One example of the present disclosure relates to a coupon. The coupon includes a first surface with a first circular channel and a second surface opposite and parallel to the first surface. The second surface is spaced a distance D0 from the first surface and includes a second circular channel concentric with the first circular channel. The coupon also includes a toroidal portion between the first circular channel and the second circular channel. The toroidal portion includes a rectangular sectional portion.

A method for non-destructively determining a mechanical property of a solid rocket motor propellant grain may comprise applying, via a gas, a force to a surface of the solid rocket motor propellant grain, wherein a deformation is formed on the surface of the solid rocket motor propellant grain in response to the applying, and measuring a pressure of the gas. This process may be performed over time to determine a lifespan of the propellant grain.

A method of inspecting a pipe joint for use in a subsea pipeline and a method of manufacturing a pipe joint for use in a subsea pipeline employing said inspection method are disclosed, the inspection method comprising the steps of: receiving a pipe joint; measuring the ovality of the pipe joint to obtain ovality data; determining that the ovality data does not exceed a predetermined maximum pipe joint ovality value; and carrying out external pressure collapse tests on a ring cut from one end of the received pipe joint, resulting in data representative of the hydrostatic collapse pressure of said pipe joint for use in confirming that the pipe joint is suitable for its intended use.

A steel pipe collapse strength prediction model generation method, a steel pipe collapse strength prediction method, a steel pipe manufacturing characteristics determination method, and a steel pipe manufacturing method capable of highly accurately predicting the collapse strength under external pressure bending of a coated steel pipe coated after steel pipe forming in consideration of the pipe-making strain during steel pipe forming and coating conditions as well as the bending strain during construction. Into a steel pipe collapse strength prediction model generated by the steel pipe collapse strength prediction model generation method, steel pipe manufacturing characteristics including the steel pipe shape of a coated steel pipe to be predicted after steel pipe forming, steel pipe strength characteristics after steel pipe forming, the pipe-making strain during steel pipe forming, coating conditions, and the bending strain during construction are input to predict the collapse strength under pressure bending of the coated steel pipe.

In some embodiments, a shaft testing device comprises a support comprising a non-contact bearing. The support is arranged to support a workpiece such as a shaft. A loading mechanism comprises a non-contact bearing. The loading mechanism is arranged to apply a load to the shaft. In some embodiments, the load is applied orthogonal to a longitudinal axis of the shaft. In some embodiments, a non-contact bearing comprises an air bearing.