Factors affecting dynamic durability of polycarbonate under bending, torsional, and impacting fatigue and in cavitation erosion and dynamic solvent cracking conditions

Ohishi, Fujio; Nakamura, Shuichi; Koyama, Daisuke; Minabe, K.; Fujisawa, Y.; Tsuruga, Y.

doi:10.1002/app.1976.070200108

Cited by 16 publications

(6 citation statements)

References 8 publications

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“…reaches a value somewhere between 100,000 and 200,000. While this may be true for some properties, such as Tg or possibly modulus, it does not hold for ultimate properties such as fatigue endurance [14,15,[74][75][76]. Also, various literature references indicate that increasing molecular weight also increases craze strength, creep resistance, and endurance under long-time steady loading [3,77].…”

Section: B Molecular Weightmentioning

confidence: 89%

Fatigue of polymers

1980

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The general nature of fracture in polymers, when subject to alternating loads as distinct from static or steadily increasing loads, is reviewed; and the molecular mechanisms and micromechanics aspects of the fatigue fracture process are discussed. Some attention is given to thermal fatigue, where fracture results primarily from a large specimen temperature rise due to hysteresis heating. However, primary emphasis is devoted to mechanical fatigue, in which fracture is a result of initiation and propagation of a crack, as a result of the periodic nature of the applied load.Attention is given to the important internal, or material, variables such as polymer structure, molecular weight, crosslinking, and filler or diluent type and content; and to significant external variables such as stress or stress intensity factor amplitude, mean stress, temperature, frequency and environment. Various methods that can be utilized to provide significant degrees of enhancement in the fatigue resistance of polymers are outlined and discussed.

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Section: B Molecular Weightmentioning

confidence: 89%

Fatigue of polymers

1980

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“…It was also proposed that the incorporation of a plasticizing comonomer n-butyl-acrylate resulted in complex FCP behavior. Various methods are used to test fatigue life, several of which were either developed or improved upon by Ohishi, et al (102). Their bending fatigue tests on PC showed that the effect of MW was irregular.…”

Section: Polymer Engineeringmentioning

confidence: 99%

“…For torsional properties, Ohishi, et al (102), developed a new testing apparatus called "MO-U". The apparatus is capable of measuring torsional fatigue strength under constant amplitude of deformation and static torsional properties.…”

Section: Polymer Engineeringmentioning

confidence: 99%

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Influence of molecular weight and molecular weight distribution on mechanical properties of polymers

Nunes

Martin²,

Johnson

1982

Polymer Engineering & Sci

366

231

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This work reviews the literature published over the last ten years on polymer mechanical properties as a function of molecular weight and molecular weight distribution, Thermal properties, stress‐strain properties, impact, fracture, fatigue, creep, stress relaxation and cracking and crazing are examined for a wide variety of homopolymers and a limited number of copolymers. In general, mechanical properties increase as the molecular weight increases. However, above some limiting molecular weight the mechanical property is usually unaffected. Although much work has been done to describe the effects of molecular weight on mechanical properties, little quantitative correlation exists. The available equations to predict such properties as cracking and crazing, Tg, Tm and tensile strength from molecular characteristics are discussed in detail. However, a more quantitative description incorporating a wider range of mechanical properties would be more useful. This would facilitate use of the vast amount of information available and enable it to be applied more readily to new polymer systems.

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“…Bhateja et al4 studied the response of an ultrahigh molecular weight linear polyethylene under a low cycle (<20), repeated the impacting of notched samples under three‐point bending. Ohishi et al5 studied unnotched polycarbonate under a repeated drop weight with a three‐point bending apparatus and produced a curve of the applied stress versus the number of cycles to failure. Sacher et al6 examined the effect of repeated impacts on polymer surfaces in terms of heat generation and mechanochemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Fracture characteristics of vinylester resin under impact fatigue

Ray

Sarkar

Bose

2002

J of Applied Polymer Sci

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ABSTRACT:The impact fatigue behavior of a vinylester resin was studied with a pendulum-type repeated-impact tester especially designed and fabricated for the determination of single-impact and repeated-impact strengths. A welldefined energy-endurance impact fatigue curve was obtained with a progressive endurance at values of the impact energy below the critical value, with the endurance limit set at an energy level of 31 N mm, 17.4% of the single-impact energy. The nature of the crack propagation was investigated for a single impact as well as high, medium, and low impact energy levels with progressively longer endurance.The fracture characteristics varied with the impact energy imparted and the number of cycles endured. The rate of lip growth was high at the higher impact energy levels with a lower number of endurance cycles and low at the lower impact energy levels with longer endurance; the repeated impacts created large and small compressive zones through the bending of specimens with the development of long and short lips, respectively.

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Factors affecting dynamic durability of polycarbonate under bending, torsional, and impacting fatigue and in cavitation erosion and dynamic solvent cracking conditions

Cited by 16 publications

References 8 publications

Fatigue of polymers

Fatigue of polymers

Influence of molecular weight and molecular weight distribution on mechanical properties of polymers

Fracture characteristics of vinylester resin under impact fatigue

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