Damping, Elasticity, and Fatigue Properties of Temperature-Resistant Materials

Lazan, B. J.; Demer, L. J.

doi:10.21236/ad0002128

Cited by 5 publications

(4 citation statements)

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“…Diring the reversed stress fatigue testing of N-155 at 1350 F several interesting observations were made relating to the damping energy (5) in the material and the resultant rapid increase in specimen temperature immediately after the start of the alternnting stress. At 136,000 psi this increase wan 25 0F.…”

Section: I Test Data and Discussionmentioning

confidence: 99%

Properties of Temperature-Resistant Materials Under Tensile and Compressive Fatigue Stress

Lazan¹,

Westberg²

1952

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Neor fat veloped gi~ps and machine ipoements are desribed for fat loat under direct stress ktension-compressio) ratios of alternating to mean stress from zero to infinity. Data are presented to indicate the uniformity of stress distribution possible with these grips and accuracy of the average stress. Dynamic creep, rapture and ductility data are reported on N-155, S-590 and Vitalliu at 1350 0 and 15000 7. under direct stress coabinations from static to reversed loading. Stress range diagrams kalternating stress versus mean stress) are presented to indicate the stress combination uhich will produce rapture and various degrees of creep in 5 to 1500 hours. Per cent elongation data are analyzed in terms of alternatingto-mean stress ratio and stress magnitude, and it is shown that both are significant variables. Elongation up to the start of third stage of creep is also analyzed in terms of stress ratio and stress mqndtude and only stress magnitude was found to be significant. The Implications of these findings are discussed. PU3LIGATION REVIEWThis report has been reviewed and is approve)..

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Section: I Test Data and Discussionmentioning

confidence: 99%

Properties of Temperature-Resistant Materials Under Tensile and Compressive Fatigue Stress

Lazan¹,

Westberg²

1952

Self Cite

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“…Even if thermal failure does not occur, the generation of heat may affect the mechanical properties of the polymer. The decrease in the modulus of elasticity during fatiguing has been long observed (Lazan & Wu, 1951;Lazan & Demer, 1951;Argawal & Dally, 1975). This drop produces an increased strain range if fatiguing has been load-controlled and a decreased stress level if strain-controlled (Crawford & Benham, 1974a).…”

Section: Introductionmentioning

confidence: 96%

The effects of cyclic stress on dental polymethylmethacrylate

1983

J of Oral Rehabilitation

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Alternative resins to traditional denture base acrylic need to be assessed for both short- and long-term performance before their potential can be evaluated. Much dental materials testing is carried out on fresh material and a baseline of knowledge about the properties of aged material is incomplete. Studies have been carried out to examine the effects of thermal and environmental fluctuation on dental acrylic, with testing procedures reconsidered so as to resemble service conditions as closely as possible. Thermal cycling proved detrimental to the resin only when superimposed on intermittent partial drying out and resaturation.

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“…The decrease in the modulus of elasticity during fatiguing has been long observed (Lazan & Wu, 1951;Lazan & Demer, 1951;Argawal & Dally, 1975). This drop produces an increased strain range if fatiguing has been load-controlled and a decreased stress level if strain-controlled (Crawford & Benham, 1974a).…”

Section: Introductionmentioning

confidence: 96%

The effects of cyclic stress on dental polymethylmethacrylate

Hargreaves

1983

J of Oral Rehabilitation

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Mechanisms of fatigue failure in polymers and the aims of fatigue testing have been examined, and factors affecting testing summarized. In the light of available work in several fields, parameters have been suggested for realistic flexural fatigue testing of denture base resins. A testing machine has been developed, with which the changes in properties of acrylic resin after fatigue in different environments can be studied. These changes developed gradually after 10(4) cycles and were related to the development of bulk crazing rather than to thermal effects. The amount of decay in the elastic modulus was not such that the material could have been said to have "failed".

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Damping, Elasticity, and Fatigue Properties of Temperature-Resistant Materials

Cited by 5 publications

References 0 publications

Properties of Temperature-Resistant Materials Under Tensile and Compressive Fatigue Stress

Properties of Temperature-Resistant Materials Under Tensile and Compressive Fatigue Stress

The effects of cyclic stress on dental polymethylmethacrylate

The effects of cyclic stress on dental polymethylmethacrylate

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