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NEPLATNÁ ASTM D905-08(2013) 1.10.2013 náhled

Doplňující informace

ASTM D905-08(2013)

Standard Test Method for Strength Properties of Adhesive Bonds in Shear by Compression Loading

Automaticky přeložený název:

Standardní zkušební metoda pro pevnostní vlastnosti lepených spojů ve smyku podle zatížení tlakem

NORMA vydána dne 1.10.2013

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Provedení	PDF - okamžité stažení - 1 923.90 Kč Tištěné - 1 923.90 Kč
Dostupnost	SKLADEM
Cena	1 923.90 Kč bez DPH
1 923.90 Kč

Informace o normě:

Označení normy: ASTM D905-08(2013)
Poznámka: NEPLATNÁ
Datum vydání normy: 1.10.2013
Kód zboží: NS-39691
Počet stran: 5
Přibližná hmotnost: 15 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM

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Anotace textu normy ASTM D905-08(2013) :

Keywords:

adhesive, bond, compression, compression loading, shear, strength properties, ICS Number Code 83.180 (Adhesives)

Doplňující informace

Significance and Use

4.1 It cannot be assumed that this test method measures the true shear strength of the adhesive bond. Many factors interfere or bias the measurement including the strength of the wood, the specimen, the shear tool designs themselves, and the rate of loading.

4.1.1 Wood failure is very common in joints made with strong adhesives. Although high wood failure is normally desired, when it occurs the measured strength is lower than the true adhesive bond strength.

4.1.2 Stress concentrations at the notches of the specimen tend to lower the measured strength. In a similar test for the shear strength of solid wood, Test Methods D143, these effects are self correcting so that the measured strength is close to the true shear strength of the wood. By analogy the same may be true in this test method, however, other factors are also involved and may alter the relationship.

4.1.3 The rate of loading affects the strength of an adhesive bond according to the adhesive's rheological properties. The more viscoelastic or plastic the adhesive, the greater effect. Thermosetting adhesives like urea- and phenol-formaldehyde are elastic. Their bond strengths can be measured over a range of loading rate from 0.038 to 1.27 cm/min [0.015 to 0.5 in./min] with no apparent affect. Thermoplastic adhesives like polyvinyl acetate, hot melts, and elastomer-based adhesives exhibit a broad range of elastic, viscoelastic, and plastic behaviors. Their bond strengths will be affected to varying degrees by changing the loading rate. Generally, increasing the rate, increases the measured strength.

4.2 This test method is suitable for product research and development, qualifying adhesives in accordance with certain product or performance specifications, and monitoring bonding process control. This test method may be suitable for comparing and selecting adhesives, however, such comparisons must be made with caution since the measured strength of some adhesives may be different in different types of joints. Strength values obtained by this test method are not suitable as design shear strengths values without adjustment by certain engineering design factors.

1. Scope

1.1 This test method covers the determination of the comparative shear strengths of adhesive bonds used for bonding wood and other similar materials, when tested on a standard specimen under specified conditions of preparation, conditioning, and loading in compression. This test method is intended primarily as an evaluation of adhesives for wood.

1.2 The values stated in SI units are to be regarded as the standard. The values given in brackets are provided for information purposes only.

1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents

D5266-13(2020)	Standard Practice for Estimating the Percentage of Wood Failure in Adhesive Bonded Joints
D143-23	Standard Test Methods for Small Clear Specimens of Timber
D907-15(2023)	Standard Terminology of Adhesives