Abstract:
A method for determining the response of a contractile or expansible biological material to a variation of the rigidity of its environment comprising the steps of: a) placing a sample (100) of the biological material between a force measurement device (200, 500) and a rigid support (300, 600); b) choosing an effective rigidity value, k eff , of the environment of the sample (100); c) maintaining the contacting area in a constant position by applying a force, F(t), where F(t) = k o .δ(t) and where δ(t) is the stretching of the elastic probe; - simultaneously translating the rigid support of a distance D(t), where D(t) = δ(t).(k o /k eff ); - determining the response of the biological material sample (100); d) repeating steps b) and c) when choosing an effective rigidity value different from former effective rigidity value when the sample (100) remains in situ.
Abstract:
A method for determining the adhesion strength of any HVOF-coating/substrate system. This method applies a spherical indentor (p) to the coated part (h) in a loading-unloading cycle. During the loading phase, the substrate deforms plastically. During the unloading phase, the elastic-plastic mismatch between coating and substrate material properties gives rise to a tensile stress normal to the interface. This leads to delamination for a sufficient indentation load. A hybrid numerical-experimental approach calculates the interfacial adhesion. The threshold load for delamination is found experimentally. A finite element model calculates the corresponding adhesion stress for delimitation. This method enables the quantitative evaluation of the adhesion for any coating/substrate interface, regardless of bond strength.
Abstract:
An apparatus for measuring adhesion of a gelled polymer (42) to a surface comprises a support spaced apart from a clamp (22) used to hold a blade (20). The blade has a knife-edge aligned in a horizontal plane with which the blade makes an angle of less than 25°. A block (18), having a planar contact face in the horizontal plane, slides over the support. A layer of the gelled polymer (42) adheres to the planar contact face to form an interface therewith. The block moves along the support towards the clamp. This causes the knife-edge to penetrate the interface to disrupt adhesion between the layer of gelled polymer and the planar contact face. A force-measuring gauge indicates the strength of the adhesive bond as the gelled polymer passes over the blade.
Abstract:
A method for selecting a polymer insert chosen on account of the qualities of its mechanical resistance for inclusion in laminated glazing. Said method consists in evaluating the tear resistance of said insert, characterized in that it also consists in evaluating the adherence of said insert in relation to at least one glass substrate.
Abstract:
The invention concerns an apparatus for measuring and peeling on an adhesive device (1) applied on a patient's skin, such as a transdermal device or a dressing. The inventive device is characterised in that it comprises: a housing (10) with a handle mounted on the top (11) to make it portable, and provided with legs (12, 13) to be supported on the patient's skin; a plurality of maintaining sensors (17) for measuring the force applying the apparatus on the patient exerted by the operator, to control the stability of the apparatus while it is operating; a hook (14) for peeling said adhesive device (1) mobile in translation on the housing (10) by powered means integral with said housing; a linear position sensor (18) integral with said hook (14) translation movement for adjusting the speed of its movement; and a force sensor (19) integral with said hook (14) for measuring the tearing force of said adhesive device (1).
Abstract:
Method and device, wherein the relative position between the surface of a material to be applied (1) to which an adhesive sheet (2) is applied and a pick up roll (6) is maintained constant by means of an auxiliary roll (9) protruding from a frame of a device (18), the forward end of the adhesive tape (2) or lead tape (3) which leads the adhesive sheet (2) being fixed to a locking means (5) of said pick up roll, angle of separation of the adhesive sheet (2) relative to the surface of the material to be applied (1) being set at a predetermined angle, the adhesive sheet (2) being pulled by rotating said pick up roll (6) at a constant peripheral speed, while said set angle being maintained, causing said sheet to be separated from said material to be applied (1) so as to be wound up on the outer surface of said roll, torque of said pick up roll (6) being detected by means of a torque detector (8), stickiness of the adhesive sheet (2) to the material to be applied (1) is indicated and/or recorded based on the output signal of said detector.
Abstract:
L'invention concerne un dispositif et un procédé de tests en pelage, pour tester la résistance au pelage d'éprouvettes (40) formées chacune d'un support (42) et d'un adhésif (44), et comprenant un bâti (60) comprenant des rouleaux (70, 74) d'axes parallèles destinés à maintenir en appui l'éprouvette (40) tout en la guidant en déplacement, des moyens de traction (76, 78) reliés à des moyens d'accrochage (84), configurés pour entraîner le décollage de l'adhésif de la surface du support, des moyens de mesure de la force (80) mise en œuvre par les moyens de traction pour tracter les moyens d'accrochage lors du pelage, une éprouvette (40) de forme complexe, telle qu'issue d'une aube renforcée. Selon l'invention, au moins un des rouleaux (70, 74) est réglable en translation par rapport aux autres rouleaux, et l'éprouvette a été préparée spécialement pour faciliter le déroulement des tests.
Abstract:
Eine Vorrichtung (1) zum Bestimmen einer beim Abziehen einer Verschlussfolie (202) von einer Verpackungswand (201) einer Verpackung (200) für ein medizinisches Erzeugnis auftretenden Kraftwird angegeben. Die Vorrichtung (1) umfasst eine Halteeinrichtung (10) und eine Fixiereinrichtung(100). Die Halteeinrichtung (10) ist eingerichtet, um einen Randabschnitt (203) der Verschlussfolie (202) zu ergreifen. Die Fixiereinrichtung (100) ist eingerichtet, um die Verpackung (200) zu fixieren. Die Vorrichtung umfasst weiterhin eine Sensoreinrichtung, die eingerichtet ist, um bei einer Bewegung zwischen Halteeinrichtung und Fixiereinrichtung die auf die Halteeinrichtung (10) wirkende Kraft zu messen. Die Fixiereinrichtung (100) weist weiterhin eine Aussparung (102) auf, die eingerichtet ist, um einen von der Verpackungswand abstehenden Abschnitt (204) der Verpackung (200) aufzunehmen.