Disclosed is a peel strength measurement apparatus using an electromagnet, the peel strength measurement apparatus including a test piece fixing unit configured to fix a test piece including at least two layers, a magnetic material attached to at least one surface of the test piece, an electromagnet configured to apply magnetic force to the magnetic material, a power supply unit configured to supply electric power to the electromagnet such that the electromagnet can generate a magnetic field, and a current controller configured to control the supply of electric power from the power supply unit to the electromagnet.

A test apparatus used for simulating debonding between a carbon fiber reinforced polymer (CFRP) and concrete in a CFRP-strengthened structure consists of a primary structural block, a secondary structural block, an adjustable hanger, a receiving slot, an attachment mechanism, a pull-off disk, a connecting plate having a plurality of rods. The adjustable hanger and the secondary structural block are slidably positioned into the receiving slot that traverses into a structural body of the primary structural block. The adjustable hanger is mainly used during double-shearing tests and mixed-mode tests, wherein both shearing and peeling is analyzed in mixed-mode tests. The secondary structural block is used in double-shear tests, mixed-mode tests, single-shear tests, tension pull-off tests, and beam-bend tests. The attachment mechanism, which holds the primary structural block, the secondary structural block, and the adjustable hanger together, is also used during single-shear tests and beam-bend tests.

A box for transporting various products comprises a prismatic body and a closing cover formed by a multilayered material (10) including an intermediate thermal insulation board (11) with an inner face and an outer face provided with an inner coating (12) and an outer coating (13). The inner coating (12) comprises a paper sheet (121) attached to the inner face of the intermediate board (11) and a stiffening and waterproof sheet (122) that forms the inner surface of the body and the cover. The outer coating (13) comprises a first layer (131) made of strong printed paper or strong paper suitable for printing; a second paper layer (132); and a flexible and waterproof sheet (133) made of recyclable polymer and arranged between the first and the second paper layers.

A method of quantitatively measuring the adhesive strength of a cover sheet of an electronic component housing container including a main body having multiple housing recesses in a longitudinal direction and a cover sheet peelably adhered to the main body. The method includes mounting the housing container on a carrier plate by fitting the housing recesses in one or more housing holes of the carrier plate which includes a plate body having the one or more housing holes in the longitudinal direction and multiple sprocket holes spaced apart from the housing holes in a width direction and arranged at regular intervals in the longitudinal direction; engaging some tooth tips of a sprocket in the sprocket holes; and peeling the cover sheet from the main body by rotating the sprocket using the width direction as an axis to move the carrier plate in the longitudinal direction.

A method of measuring adhesive strength between an element body and a porous protection layer that are included in a sensor element includes (a) a step of holding a portion of the element body where the porous protection layer is absent with an elastic force exerted by a holding jig, and placing a peeling jig at a position between the porous protection layer and the holding jig in the longitudinal direction such that the element body is allowed to move in the longitudinal direction while the porous protection layer is prevented from moving in the longitudinal direction toward the holding jig; and (b) a step of moving, after the step (a), the peeling jig pushes the porous protection layer in the longitudinal direction, and measuring the adhesive strength of the porous protection layer.

A peel testing device designed to test the resistance to peeling of test pieces each formed from a support and from a reinforcement glued to this support, and comprising a frame with a face roller and at least one guide roller, a traction machine configured to peel the reinforcement from the surface of the support in a peeling direction tangential to the face roller and a sensor for measuring the force exerted by the traction machine during peeling, the device also comprising a fastening cable connected, on the one hand, to the traction machine and on the other hand to the face roller with which it forms a pulley system and the face roller which has a greater diameter than that of the guide roller comprises a mounting element for holding the reinforcement fixedly there.

A method of performing an automated non-destructive examination of a composite structure includes identifying surface damage on the composite structure, coupling an automated tap tester device to a surface of the composite structure at a location of the surface damage, and performing, with the automated tap tester device, a plurality of tapping impacts on the surface within a testing area that encapsulates the surface damage. The method also includes receiving a plurality of acoustic signals associated with the plurality of tapping impacts, modeling sub-surface damage associated with the surface damage based on an analysis of the plurality of acoustic signals.

A portable shear testing device includes a shear force unit that has two elongated jaw members that are positioned adjacent to each other. One of the jaw members can be moved away from the other, stationary jaw member. One of the jaw members is moved by a pivotally mounted lever that laterally moves a load transfer block connected to the jaw member. A digital load cell is positioned between the lever and the load transfer block and a threaded knob is rotated to press against the lever.

Methods to accurately determine the maximum bending moment Mb for a spot weld are provided. The methods include subjecting a test coupon including a spot weld, to a coach peel test and monitoring the test coupon using digital image correlation in order to determine the bending moment arm length at peak force. The bending moment arm length at peak force is multiplied by the peak force value to provide an accurate maximum bending moment for the spot weld. The calculated maximum bending moment Mb is used in a combined force based spot weld failure calculation to predict failure of a spot weld under a combined loading condition.

A system for testing adhesive is disclosed, comprising a pull testing machine and a rigid spine. The rigid spine has a face extending along a longitudinal axis between a first and second projection, and one of the projections is moveable relative to the other. The face is configured to support a substrate, with a flexible media adhered to the substrate. The rigid spine also has a coupler configured to connect the spine to the pull testing machine.