摘要:
The invention relates to a device and a method for peeling tests, for testing the resistance to peeling of coupons (40) each formed of a substrate (42) and an adhesive (44), and comprising a frame (60) with rollers (70, 74) having parallel axes for holding the coupon (40) in abutment whilst guiding its displacement, traction means (76, 78) connected to attachment means (84) which are designed to bring about the lifting of the adhesive off the substrate surface, means (80) of measuring the force exerted by the traction means for pulling the attachment means during the peeling stage, and a complex-shape coupon (40), such as a coupon taken from a reinforced vane. According to the invention, at least one of the rollers (70. 74) can be adjusted in translation relative to the other rollers, and the coupon is prepared especially to facilitate the tests.
摘要:
A method for specifying stretch flange limit strain according to the present invention includes specifying stretch flange limit strain so as to satisfy a relation in the following formula by using: strain gradient in an inward direction directed from an end portion of a metal sheet at a time a press load is applied; and strain gradient in a sheet thickness direction of the metal sheet intersecting the loading direction: ε θlim = A a ⋅ Δ ε θ / Δr + b ⋅ Δ ε θ / Δt + c where ε θlim represents the stretch flange limit strain (tangential direction of the sheet edge), Δε θ /Δr represents the strain gradient in the inward direction, Δε θ /Δt represents the strain gradient in the sheet thickness direction, A, a, and b represent influence coefficients, and c represents the limit strain at a time the strain gradient is zero.
摘要:
A method for use in determining hydrogen embrittlement in a plated sample is provided. The method includes positioning the plated sample between a first holding member and a second holding member, moving the second holding member towards the first holding member to bend the plated sample, and applying a static load to the plated sample for a predetermined duration of time. The static load is applied by bending the plated sample to a distance between the first and second holding members that is a predetermined percentage of a baseline ultimate failure distance of the plated sample.
摘要:
A multi-axis fatigue testing device includes a multi-axis test fixture having a multiple input, multiple output mechanical linkage driven by a plurality of actuators and a controller operating each of the plurality of actuators in real time and in synchronization to produce user-defined multiple fatigue cycle profiles. At least one of the actuators driving the mechanical linkage acts against an artificial load characterized by a stiffness. The stiffness is selected to increase a resonance frequency of the test fixture to allow fatigue testing at higher frequencies for a wider range of samples.
摘要:
A wedge-type anchor assembly, capable of meeting cracked concrete testing standards, comprises an anchor bolt component and a substantially C-shaped expansion sleeve component annularly disposed about the anchor bolt component. A plurality of annular grooves, threads, or teeth are disposed only about the forward end portion of the expansion sleeve component, as opposed to throughout the entire axial length thereof, so that when the anchor bolt component is moved axially through the expansion sleeve component, the maximum interference area (M.I.A.) and maximum interference volume (M.I.V.) can be generated between the anchor bolt component and the expansion sleeve component in a controlled and predictable manner, as well as between the expansion sleeve component and the internal peripheral side wall portions of a concrete substrate or substructure can be generated so as to enhance pull-out resistance and reliability of the anchor assembly within the concrete substructure or substrate. The expansion sleeve component may be plated with a tin-zinc (Sn—Zn) composition, and the rear end portion of the expansion sleeve component may have a larger diametrical extent than the forward end portion of the expansion sleeve component so as to enhance pull-out resistance.
摘要:
The object of the invention is to provide an alternative method for durability testing of an engine block. The engine block comprises cylindrical cavities, which cylinder cavities are separated from each other by intermediate walls, each intermediate wall comprising a bolt hole. The method comprises the step of: removing a test specimen from an area of the intermediate wall of the engine block, such that the test specimen comprises the bolt hole.
摘要:
An apparatus (10) for testing attachment features (26,28,30,32) of components (12,14) comprises a first member (16) having a first end (18), a second end (20), a first edge (22) and a second edge (24). The first edge (22) has a first firtree slot (26) to receive a first component (12) and the second edge (24) has a second firtree slot (28) to receive a second component (14). The first component (12) has a firtree attachment feature (30) to fit the first slot (26) and the second component (14) has a firtree attachment feature (32) to fit the second slot (28). The first end (18) of the first member (16) has flanges (34,36) extending laterally and the second end (20) of the first member (16) has flanges (38,40) extending laterally such that the first member (16) is substantially H-shaped in cross-section. First load means (42) apply a load on the first component (12) and second load means (44) apply a load on the second component (14) substantially in the opposite direction to the load on the first component (12). The apparatus may be used to test firtree attachments for turbine blades and discs.
摘要:
A method of simulating life of a rotor blade mounting feature mounted in a complementary rotor disc mounting feature comprises the steps of providing two specimen mounting features (37) each having portions defining pressure faces matching in profile respective faces of the rotor blade mounting feature; providing a fixture (38) having two opposed mounting features (39) each having portions defining pressure faces (78) matching in profile respective faces of the rotor disc mounting feature; mounting the specimen mounting features (37) in the fixture mounting features (39); applying a first load to the specimen mounting features (37); measuring a strain in a region (86) of the fixture (38) between the fixture mounting features (39); applying a second load to the fixture (38), the second load being substantially perpendicular to the first load; and controlling the second load in response to the measured strain. A high cycle load may simultaneously be applied to the specimen mounting features (37). Claims are also included for an apparatus (10) for carrying out the method.