Fatigue crack growth in polymers

Ramsteiner, F.; Armbrust, T.

doi:10.1016/s0142-9418(00)00039-8

Cited by 38 publications

(24 citation statements)

References 4 publications

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“…A comparison of these two methods from early work showed that comparable results can be generally achieved with these both methods [18]. In this study, the macro-crack length was directly measured from the captured images.…”

Section: Characterization Of Escmentioning

confidence: 77%

A study on environmental stress cracking in nano-SiO2-filled polycarbonate

Lin

Schlarb

2012

J Mater Sci

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In this study, the environmental stress cracking (ESC) resistance of nano-SiO 2 particle-filled polycarbonate (PC) was investigated at room temperature by using a fracture mechanical test method. Two PC-based nanocomposites with nano-SiO 2 content of 1 and 4 vol% were compounded using a twin-screw extruder. The incorporation of nanoparticles into PC leads to an improvement in ESC resistance, which increases with increased filler loading up to 4 vol%. Fractography analyses suggest that the formation of cavities/debonding and localized microdeformation of matrix induced by nanoparticles as a result of energy dissipation are responsible for the improvement of ESC resistance.

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Section: Characterization Of Escmentioning

confidence: 77%

A study on environmental stress cracking in nano-SiO2-filled polycarbonate

Lin

Schlarb

2012

J Mater Sci

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“…The FCP tests were performed at increasing stress intensity factors (DK ) with a constant DK gradient as a function of the crack length, a, of 0.15 mm À1 . A detailed description of this particular FCP procedure is given in [22,23].…”

Section: Mechanical Testingmentioning

confidence: 99%

Toughening of immiscible PPE/SAN blends by triblock terpolymers

Ruckdäschel

Sandler

Altstädt

et al. 2007

Polymer

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The mechanical performance of immiscible blends of poly(2,6-dimethyl-1,4-phenylene ether) (PPE) and poly(styrene-co-acrylonitrile) (SAN) and the subsequent influence of compatibilisation by tailored polystyrene-block-polybutadiene-block-poly(methyl methacrylate) triblock terpolymers (SBM) on the mechanical performance under static and dynamic loads is analysed in detail. A PPE/SAN 60/40 blend was selected as a base system for the compatibilisation experiments. The observed static tensile behaviour is described by micromechanical models and correlated to the blend microstructures as observed by transmission electron microscopy. In most cases, the addition of the SBM triblock terpolymers further enhances the ductility of the blend while only leading to a minor reduction of modulus and strength. Triblock terpolymers with symmetric end blocks, mainly located at the interface between PPE and SAN, led to nearly isotropic specimens. In contrast, SBM materials with a longer polystyrene block predominantly formed micelles in the PPE phase and the blends revealed a highly anisotropic morphology. Comparative investigations of the fatigue crack growth behaviour parallel to the direction of injection also reflected this variation in mechanical anisotropy of the compatibilised blends. A poor toughness and a predominant interfacial failure were observed in the case of the SBM with a long polystyrene block. In contrast, a considerable improvement in properties as a result of pronounced plastic deformations was observed for blends compatibilised by triblock terpolymers with symmetric end blocks. The systematic correlation between morphology and mechanical performance of compatibilised PPE/SAN blends established in this study provides an efficient way for the desired selection of suitable and effective compatibilising agents, ensuring both a superior multiaxial toughness as well as a high strength and modulus of the overall system.

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“…Kim (1993Kim ( , 1994 proposed that fatigue crack growth rate of most polymers increased with the temperature increasing and decreased with the loading frequency increasing. Ramsteiner and Armbrust (2001) solved some fatigue experimental questions of polymers such as the measurement of crack propagation, the influence of the specimen shape and the applied frequency, the measurement with constant or increasing stress intensity amplitude, and the propagating crack as a signal for transitions in internal deformation mechanisms. Yao (2002Yao ( , 2003Yao ( , 2004 investigated dynamic fracture behavior of thin PMMA plates with threeand four-parallel edge cracks by means of the method of caustics in combination with a high-speed Schardin camera; dynamic fracture behavior of the thin PMMA sheet with two overlapping offsetparallel cracks under tensile loading using the optical method of caustics in combination with a Cranz-Schardin high-speed camera; and the fracture characterization of a V-notch tip in PMMA material by means of an optical caustics method, respectively.…”

Section: Introductionmentioning

confidence: 99%

Study of anisotropic mechanical properties for aeronautical PMMA

Shang

Yang

Zhang

2014

Lat. Am. j. solids struct.

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For the properties of polymer are relative to its structure, the main purpose of the present work is to investigate the mechanical properties of the aeronautical PMMA which has been treated by the directional tensile technology. Isodyne images reveal the stress state in directional PMMA. And then, an anisotropic mechanical model is established. Furthermore, all mechanical parameters are measured by the digital image correlation method. Finally, based on the anisotropic mechanical model and mechanical parameters, the FEM numerical simulation and experimental methods are applied to analyze the fracture mechanical properties along different directions.

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Fatigue crack growth in polymers

Cited by 38 publications

References 4 publications

A study on environmental stress cracking in nano-SiO2-filled polycarbonate

A study on environmental stress cracking in nano-SiO2-filled polycarbonate

Toughening of immiscible PPE/SAN blends by triblock terpolymers

Study of anisotropic mechanical properties for aeronautical PMMA

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