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ASTM D3433-99(2020)
Standard Test Method for Fracture Strength in Cleavage of Adhesives in Bonded Metal Joints
NORMA vydaná dňa 1.1.2020
Informácie o norme:
Označenie normy: ASTM D3433-99(2020)
Dátum vydania normy: 1.1.2020
Kód tovaru: NS-980664
Počet strán: 7
Približná hmotnosť: 21 g (0.05 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D3433-99(2020) :
Keywords:
adhesive, bonded joint, cleavage, double-cantilever beam, fracture strength,, ICS Number Code 83.180 (Adhesives)
Doplňujúce informácie
| Significance and Use | ||||||||||||||||||
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Note 2: Crack growth in adhesive bond specimens can proceed in
two ways: (5.1 The property G1c (and G1a if relevant) determined by
this test method characterizes the resistance of a material to
slow-stable or run-arrest fracturing in a neutral environment in
the presence of a sharp crack under severe tensile constraint, such
that the state of stress near the crack front approaches tritensile
plane strain, and the crack-tip plastic region is small compared
with the crack size and specimen dimensions in the constraint
direction. It has not been proven that tough adhesive systems fully
meet this criteria. Therefore, data developed using equations based
on this assumption may not represent plane-strain fracture values.
Comparison of fracture toughness between adhesive systems widely
different in brittleness or toughness should take this into
consideration. In general, systems of similar type toughness
5.1.1 Cyclic loads can cause crack
extension at 5.2 This test method can serve the
following purposes:
5.2.1 In research and development to establish, in quantitative terms, significant to service performance, the effects of adhesive composition, primers, adherend surface treatments, supporting adhesive carriers (scrim), processing variables, and environmental effects. 5.2.2 In service evaluation to establish the suitability of an adhesive system for a specific application for which the stress conditions are prescribed and for which maximum flaw sizes can be established with confidence. 5.2.3 For specifications of acceptance and manufacturing quality control, but only when there is a sound basis for specification of minimum G1c values. The specification of 1.1 This test method (1, 2, 3, 4, 5)2 covers the determination of fracture strength in cleavage of adhesives when tested on standard specimens and under specified conditions of preparation and testing (Note 1). 1.2 This test method is useful in that it can be used to develop design parameters for bonded assemblies. Note 1: While this test method is intended for use in
metal-to-metal applications it may be used for measuring fracture
properties of adhesives using plastic adherends, provided
consideration is given to the thickness and rigidity of the plastic
adherends.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||||||||||||
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