A method of producing XY mechanical test specimens uses material extrusion additive manufacturing. Toolpaths are generated which vary a width of individual beads from a first narrow width in a gage length to a second width greater than the first width in a test specimen grip region. The test specimens produced using additive manufacturing or 3D printing processes reduce a severity of stress concentrators that cause the specimens to fail in the gage length.

The invention discloses an experimental apparatus and an experimental method for the negative bending moment zone of a continuous beam to bear load under chloride environment, relating to the technical field of engineering experiment, comprising a high-rigidity main frame, a loading system, an erosion system and a test beam; the test beam is detachably arranged on the high-rigidity main frame; the loading system is installed on the high-rigidity main frame and under the test beam, and is used to apply load to the test beam; the erosion system is arranged on the test beam with built-in chloride solution; the test beam is a continuous beam that meets the design requirements. The experimental apparatus provided by the invention is stable and reliable, easy to use, and can provide the experimental conditions for the wet-dry cycle and the load-bearing coupling reaction in chloride environment.

A microfluidic chip having a micro channel for processing a sample is provided. The micro channel may focus the sample by using focusing fluid and a core stream forming geometry. The core stream forming geometry may include a lateral fluid focusing component and one or more vertical fluid focusing components. A microfluidic chip may include a plurality micro channels operating in parallel on a microfluidic chip.

Disclosed is a test rig and a method for mechanical load testing of a specimen extending along a longitudinal axis from a first specimen end to a second specimen end and comprising a composite material extending along the longitudinal axis from a first composite end to a second composite end and a primary elongate component extending along the longitudinal axis from a first primary component end to a second primary component end, the first primary component end being the first specimen end, and wherein the composite material encapsulates the primary elongate component along a first interface region extending along the longitudinal axis from the second primary component end to the first composite end. The method comprises applying a load to the specimen resulting in an axial load component and a bending moment being imposed to the specimen.

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.

A true stress testing system broadly comprising a force input machine, an imaging system, and a computer. The imaging system includes a light source for projecting a light beam at the specimen in a first direction and a camera positioned on an opposite side of the specimen for receiving portions of the light beam not blocked by the specimen such that a shadow image of the specimen is created via the camera. The computer may determine a minimum dimension of the specimen perpendicular to the first direction at a point in time over a plurality of points along the force axis via the shadow image of the specimen such that the processor accounts for changes in position of the minimum dimension along the specimen. A true stress of the specimen may then be determined according to the minimum dimension of the specimen perpendicular to the first direction at the point in time.

A method including obtaining a metal pipe with a longitudinal submerged arc weld, an axis of the longitudinal submerged arc weld being oriented parallel to a rotationally symmetric axis of the metal pipe and cutting a first test beam and a second test beam from the metal pipe with each test beam extending on both sides of the axis of the longitudinal submerged arc weld and has a cuboid shape. The method further including forming a double-beam assembly by clamping two spacers between the first and second test beams such that the two spacers are symmetrically disposed at an equal distance on either side the longitudinal submerged arc weld. The method further including immersing the double-beam assembly in a liquid test solution for a predetermined period of time before removing it from the liquid test solution and disassembling the double-beam. The method further including examining the first and the second test beam using a metallographic sectioning method.

The present invention provides a standard testing methodology for making quantitative determinations as to the chemical resistance of thermoplastics commonly used for non-disposable medical devices by evaluating the retention of tensile and/or impact properties of the thermoplastic materials after exposure to chemicals associated with healthcare grade disinfectants. Versions of the test methods may be used with any of a variety of different thermoplastic materials, each having a different stiffness or elastic modulus; and versions of the test methods may be used with any of a variety of different hospital grade cleaning agents or disinfectants. Using the methodology of embodiments of the present invention, different thermoplastic materials may be tested against different cleaners or disinfectants to provide a uniform basis for comparison. This allows those who make chemicals, polymers and medical equipment to have a uniform way of evaluating those materials for compatibility with various cleaners and disinfectants used in the medical industry to make objective comparisons, and to allow end users to make the same evaluations and comparisons.

A microfluidic chip having a micro channel for processing a sample is provided. The micro channel may focus the sample by using focusing fluid and a core stream forming geometry. The core stream forming geometry may include a lateral fluid focusing component and one or more vertical fluid focusing components. A microfluidic chip may include a plurality micro channels operating in parallel on a microfluidic chip.

A method including obtaining a metal pipe with a longitudinal submerged arc weld, an axis of the longitudinal submerged arc weld being oriented parallel to a rotationally symmetric axis of the metal pipe and cutting a first test beam and a second test beam from the metal pipe with each test beam extending on both sides of the axis of the longitudinal submerged arc weld and has a cuboid shape. The method further including forming a double-beam assembly by clamping two spacers between the first and second test beams such that the two spacers are symmetrically disposed at an equal distance on either side the longitudinal submerged arc weld. The method further including immersing the double-beam assembly in a liquid test solution for a predetermined period of time before removing it from the liquid test solution and disassembling the double-beam. The method further including examining the first and the second test beam using a metallographic sectioning method.