Adhesive bonding ASTM tests

Anderson, G. P., et al., Effect of Removing Eccentricity from Button Tensile Adhesive Tests, Adhesively Bonded Joints Testing, Analysis, and Design, ASTM STP 981, W. S. Johnson, ed., American Society of Testing and Materials, Conshohocken, PA, 1988. 

Adhesively Bonded Joints Testing, Analysis, and Design, STP 981, edited by W.S. Johnson, 1988, 320 pp., ASTM International. 

W. S. Johnson (Ed.), Adhesively Bonded Joints Testing, Analysis and Design. ASTM International, West Conshohocken, PA (1988). 

ASTM D1062-72 Cleavage strength of metal-to-metal adhesive bonds ASTM D950-72 Impact strength of adhesive bonds Tests relating to bond durability... 

Fig. 19. Cleavage test for metal-to-metal adhesive bonds (ASTM D1062).

Johnson WS (ed) Adhesively bonded joints testing, analysis and design, ASTM STP 981. American Society for Testing and Materials, Philadelphia, pp 28-38 Wycherley GW, Mestan SA, Grabovac I (1990) A method for uniform shear stress-strain analysis of adhesives. J Test Eval 18 203... 

ASTM D950-03, Standard Test Method for Impact Strength of Adhesive Bonds, ASTM Int... 

Peel tests are accompHshed using many different geometries. In the simplest peel test, the T-peel test, the adherends are identical in size, shape, and thickness. Adherends are attached at thek ends to a tensile testing machine and then separated in a "T" fashion. The temperature of the test, as well as the rate of adherend separation, is specified. The force requked to open the adhesive bond is measured and the results are reported in terms of newtons per meter (pounds per inch, ppi). There are many other peel test configurations, each dependent upon the adhesive appHcation. Such tests are well described in the ASTM hterature. 

A series of delamination rate tests were conducted on the Chemlok 205/220 adhesive system. The test specimen was developed from a modification of the standard (ASTM D-429) peel test. Each specimen had two one inch square bond areas on a monel substrate. 

Corrosion Testing. Salt spray testing (ASTM-B-117-52,54) was used to determine durability of adhesive bond in corrosive environment. Lap shear samples were exposed to salt spray for 14 days and then immediately tested for lap shear strength. 

Wedge Test. The adhesive bond durabilities of the Inhibitor-treated 7075-T6 surfaces were evaluated by wedge tests (ASTM D-3762) on bonded specimens using the FM 123-2 epoxy adhesive to simulate the epoxy primer. The specimens were placed In a humidity chamber at 65°C and 95% relative humidity and removed at specified time Intervals to record the crack tip locations after each examination, they were returned to the humidity chamber. 

Ball, USP 2,643,611(1953) CA 47,9016 (1953)(Inhibitor strips for large-grain rocket propellants are attached by means of an adhesive consisting of NC dissolved in Et lactate, cello solve, mesiryl oxide, Bu acetate or diacetone alcohol. These solvents act as a mutual plasticiser for the material of the inhibitor strip and for the propellant itself) 5)G.Epstein, "Adhesive Bonding of Metals," Reinhold, NY(1954> 6)ASTM Committee D-l4on Adhesives, Standards on Adhesives, Specifications, Physical Tests, Definitions, Philadelphia, Penna(1954) 7)... 

ASTM D 896-84, Standard Test Method for Resistance of Adhesive Bonds to Chemical Reagents, specifies the testing of adhesive joints for resistance to solvents and... 

ASTM D 2093, Preparation of Surfaces of Plastics Prior to Adhesive Bonding, American Society for Testing and Materials, Conshohocken, PA. 

The specimens of both ASTM D-897 and D-2094 can be adapted for use with materials that cannot readily be manufactured into conventional specimen shapes, by the approach shown schematically in Fig. 2c. Such materials as plates of glass or ceramics and thin polymer films can be sandwiched between the spool-like sections made of materials that can be more readily machined such as metals. Obviously, to obtain meaningful results from this test, the strength of the adhesive bond to the spool segments must be greater than that to the thin film or sheet. 

ASTM D-1344 describes a cross-lap specimen of the type shown in Fig. 2d for determining tensile properties of adhesive bonds. Wood, glass, sandwich, and honeycomb materials have been tested as samples in this general configuration. Even under the best of circumstances, one would not anticipate the stress distribution in such a case to be very uniform. The exact stress distribution is highly dependent on the relative flexibilities of both the cross beams and the adhesive. Certainly, caution must be exercised when comparing tensile strength from this test with data obtained from other tensile tests. Probably for these reasons, this test is scheduled by ASTM for discontinuation. 

One of the simplest peel tests to conduct is the 180° peel test described in ASTM 903, Standard Test Method for Peel or Stripping Strength of Adhesive Bonds. In this test, one adherend is much more flexible than the other, so that upon gripping and pulling the two unbonded ends, the sample assumes the configuration shown in Fig. 8d. 

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