A coupon suitable for peeling tests, derived from a vane and including: (i) a portion of blade that comprises an intrados surface, an extrados surface and a leading edge and/or trailing edge and (ii) a vane reinforcement that covers and is glued to at least a part of the intrados surface, a part of the extrados surface and which extends beyond the leading and/or trailing edge. The reinforcement is split over the entire length of the leading edge and/or trailing edge such that the reinforcement is separated into two plates separate from one another and facing each other on either side of the slit beyond the leading and/or trailing edge. Furthermore, at least one of the plates furthermore comprises, beyond the leading and/or trailing edge, notches configured to provide a hold to this same plate.

A testing arrangement includes a test specimen that is formed of a fiber composite that has first, second, and third groups of fiber ply layers. Each fiber ply layer is curved so as to have an elbow. The elbows are joined back-to-back at a central region to form first, second, and third arms that extend outwardly from the central region. The elbows define a space in the central region, and there is a space-filler within the space. The test specimen is mounted in a testing fixture such that the first and second arms are in four-point bend loading and the third arm is oriented vertically. The testing fixture is actuatable to apply an actuated load. There is an applied load on the third arm. The applied load and the actuated load cause stress in the space-filler for evaluating mechanical behavior of the space-filler.

A biaxial load test specimen includes a main body and four arms. The main body has a plurality of through-holes aligned along axial directions of two load axes orthogonal to each other. The four arms extend from the main body in the respective axial directions of the load axes. Each of the arms has a plurality of slit grooves extending, on respective extensions of the through-holes aligned in the axial directions, along the respective axial directions.

A device to test the peeling resistance of coupons, each formed of a support and an adhesive, includes: (i) a frame including rollers with parallel axes designed to maintain the coupon supported while guiding movement of the latter, (ii) a traction device including a vertical jack linked to an attachment element including a loop configured in order to cause detachment of the adhesive from the surface of the support, (iii) a device for measuring the force exerted by the jack in order to pull the loop during peeling, and (iv) a coupon, complex in shape, such as one derived from a reinforced vane. At least one roller is translationally adjustable in relation to other rollers and the coupon is specially prepared in order to facilitate carrying out the tests.

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 bi-axial testing apparatus, system and method may be used with known uni-axial material testing machines to perform biaxial displacement control (e.g., compressive and/or tensile) testing on a specimen. As such, the apparatus, system and method may be capable of providing bi-axial compressive or tensile loads with uni-axial motion and only one actuator. The specimen may be a cubic specimen including, without limitation, 3D printed cellular materials, composite materials, foams, bio-medical materials, and the like. The apparatus generally includes a first or top fixture forming a first re-entrant surface and a second or bottom fixture forming a second re-entrant surface. When the fixtures are mounted, the re-entrant surfaces form a testing space in the center to accommodate a specimen to be tested and the re-entrant surfaces provide testing forces in two axes in response to an actuator providing motion of at least one of the fixtures in one axis.

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 determines the tack of a material placed in contact with a surface. A sample is provided of the material, the sample including a sheet whose width increases from a first narrow end to a second wide end. The sample is applied to an upwards facing supporting surface of plate. The sample is compacted against the supporting surface of plate and a weight is attached to the first end of the sample. The plate is turned over in such a way that the supporting surface faces downwards. The detachment of the sample from the supporting surface is measured in terms of distance detached from the first end of the sample as a function of time.

Provided is a testing apparatus for a display apparatus comprising a base, a hit unit mounted on the base to translate in a first direction, a second direction, and a third direction perpendicular to each other, and a pad unit mounted on the base to rotate around each of a first axis perpendicular to an upper surface of the base and a second axis perpendicular to the first axis, wherein the display apparatus is disposed on the pad unit and includes flat and curved areas.

A testing arrangement includes a test specimen that is formed of a fiber composite that has first, second, and third groups of fiber ply layers. Each fiber ply layer is curved so as to have an elbow. The elbows are joined back-to-back at a central region to form first, second, and third arms that extend outwardly from the central region. The elbows define a space in the central region, and there is a space-filler within the space. The test specimen is mounted in a testing fixture such that the first and second arms are in four-point bend loading and the third arm is oriented vertically. The testing fixture is actuatable to apply an actuated load. There is an applied load on the third arm. The applied load and the actuated load cause stress in the space-filler for evaluating mechanical behavior of the space-filler.