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Sustained Load Methods

A number of methods for applying stress to test specimens have been reported. They fall into one of two groups, those in which individual specimens are stressed and those in which a number of specimens, joined together, are stressed. [Pg.390]


The standard methods for testing creep, the elongation and possible rupture of a plastic under sustained load, are ISO 899-1 [34] for tension and ISO 899-2 [35] for flexure. Tests last typically for 1,000 hours or six weeks. Tests at higher temperatures may be required either because of a higher service temperature or to provide a prediction of longer term behaviour by time-temperature shifting. [Pg.73]

The method used for testing durability of adhesive bonds was developed at 3M by W.D. Sell (16) and is called "sustained load stress durability". The metal substrates were 2024T-3 clad or bare aluminum alloy, 5052T-4 bare aluminum alloy or 1010 cold rolled steel. The surface preparation for the aluminum alloys was either the "optimized" FPL-etch" or the H PO -anodization process (12). The steel was solvent wiped. If a primer was used, it was cured before application of the adhesive. Film... [Pg.632]

Durability test methods lack standardization and are not always representative of realistic service conditions it is therefore essential to develop standard accelerated ageing tests that correspond to actual in-situ environments. In particular, significant effort should be undertaken to study the synergistic effects between environmental factors (moisture, temperature, alkalinity, chemical attacks) and mechanical loads (sustained loads, fatigue) at both the material and structural scales. [Pg.430]

The slow strain-rate test method (10 s" to 10" s" ) is an accelerated test method when compared with a sustained-load test method. The slow strain-rate test provides an "accelerated test for measuring the threshold when compared with the 5000 hours required by ASTM E 1681, for steels at a hardness of 50-52 HRC. [Pg.338]

The RSL is an economical test, as only one specimen may be required to obtain a measure of the threshold value, as compared to the dozen or so normally required to conduct sustained load run-out tests as with the cantilever beam type (ASTM E 1681). The test method takes advantage of using small specimens to measure the fracture toughness [47] and utilizes potentiostatic test methods to simulate conditions of galvanic coupling on the specimen [48]. [Pg.338]

Consolidation settlement is usually significant in soft to medium stiff clayey soils. Creep settlement occurs most significantly in overconsolidated clays under large sustained loads and can be estimated by using the method developed by Booker and Poulos (1976). In principal, however, long-term settlement can be included in the calculation of ultimate settlement if the design parameters of soil used in the calculation reflect the long-term behavior. [Pg.260]


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Sustained load

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