Delamination test

Fig. 3,34. Edge delamination test (EDT) (a) specimen configuration (b) typical stress-strain curve (c) outward curvature along specimen edges. After Whitney and Knight (1985).

Chiang MYM, Wu WE, He JM, Amis EJ (2003) Combinatorial approach to the edge-delamination test for thin film reliability - concept and simulation. Thin Solid Films 437 197-203... 

COMBINATORIAL EDGE DELAMINATION TEST FOR THIN FILM ADHESION -CONCEPT, PROCEDURE, RESULTS... 

Fig. 1 A schematic of the free edge effect and edge-delamination test.

Comhinalorial Edge Delamination Test for Thin Film Adhesion... 

Fig. 3 A schematic of the combinatorial approach to the edge delamination test the multivariant specimen with film thickness and temperature gradients, and final failure map (a) a square pattern array of individual edge delamination samples on the substrate (b) the cutting depth, d, and width, w(c).

Fig. 4 A schematic of the combinatorial approach to the modified edge delamination test the multivariant specimen with constant film thickness, overcoating layer thickness and temperature gradients.

Fig. 7 The initial test result of the combinatorial edge delamination test for PMMA adhesion to silicon substrate.

Standard Mode I Double Cantilever Beam specimens for delamination testing of a unidirectional (UD) IM7/977-2 composite were Z-pinned with two separate blocks of Z-Fiber reinforcement. The reinforced beam configuration was such as to provoke an unstable delamination, propagating between the two Z-pin blocks. Crack resistance curves for these specific geometry specimens of IM7/977-2 indicate that the unstable delamination cracks are arrested by the second Z-pin block, with the crack propagation resistance being dictated primarily by the Z-pinning density within a block. Acoustic emission analysis is used to interpret visual observations and other test data. 

There are numerous techniques known for adhesion and delamination testing, some of the most common being a tape test, stud-pull test, scratch test, and an indentation test [1]. In the tape test, a tape is pulled off the surface containing a scratch, which provides the failure initiation. In the stud pull test, a stud held with thermosetting epoxy is pulled off the film surface. The indentation test, wherein a ball is pressed into the surface, is used for hard coatings, and the failure pattern indicates acceptable behavior. In the scratch test, where an indenter moves in both vertical (loading) and horizontal (sliding) directions, an acoustic emission sensor allows for detection of the initiation of fiacture, while the scratch pattern indicates the type of failure. 

The nano+micro tester UNMT provides a useful platform for all common types of adhesion and delamination tests, with the complete utilization of all the advantages of the multi-sensing technology. 

In experiments on the adhesion of a powder, HOPE modified by oil-soluble contact Cl containing salts of organic amines or sulfur acids with either carboxyl or hydroxyl groups has been used. The composition of HDPE - - Cl has been applied to a preliminary cleaned and degreased 100—pm-thick aluminum foil at a temperature of T = 155 5°C and a pressure of p = 7—10 MPa. The splices have then been subjected to thermal treatment in an oven at 200° C for one hour, which corresponded to the maximum strength of the adhesive joints. The strength has been estimated by delamination tests under a constant deformation rate. Not less than 20 samples were tested in each point to show 10-30% variation factor at a confidence interval of 0.95. 

For phenolic FRP-wood bonded assemblies, the following factors relating to the performance of the bonded interface were investigated (1) the influence of coupling agents, (2) the influence of clamping pressure, and (3) the influence of open/closed assembly time. The sizes of the specimens used were smaller than those specified in ASTM D2559. Each laminated FRP-wood assembly for the delamination test consisted of four pieces of red maple wood and two pieces of FRP strips four wood pieces [each 19.05 mm X 76.2 mm X 609.6 mm (0.75" x 3" x 24")] were placed at the center of the... 

The ASTM D2559 wetting-and-drying cyclic delamination test [4] is sensitive enough to investigate key performance parameters, such as use of a coupling... 

When the steel/adhesive/PMT samples were top-coated by an alkyd layer (40 pm thick) very good protection was observed in delamination tests in chloride solution and under cathodic polarization. The delamination tests failed when the alkyd layer was deposited directly either on bare steel or on steel coated only with PMT. 

A summary of quasi-static delamination test methods for continuous-fibre, unidirectional FRP composites is given in Table 8.1. For mode 1, several standard test methods exist, namely, JIS K7086 ( Testing methods for interlaminar fracture toughness of carbon fibre reinforced plastics , 1993) this also includes a quasi-static mode 11 standard test, ASTM... 

High loading-rate delamination test methods... 

The available data for unidirectionally reinforced laminates are typically interpreted such that mode I values seem to constitute a lower bound compared to the other modes, specifically mode II, at least for quasi-static tests. For cyclic fatigue delamination tests, it has been shown by Martin and Murri [59] that cyclic delamination fatigue for CFRP... 

---